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  • Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory  (142)
  • Uppsala  (60)
  • Washington, DC : Smithsonian Institution Press  (51)
  • English  (253)
  • 1995-1999  (11)
  • 1980-1984  (209)
  • 1970-1974  (33)
Collection
Language
  • English  (253)
Years
Year
  • 1
    Series available for loan
    Series available for loan
    Uppsala
    Associated volumes
    Call number: SR 93.0768(775)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 41 S.
    ISBN: 9171582185
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 775
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Call number: SR 93.0768(781)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 43 S.
    ISBN: 9171582312
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 781
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 3
    Series available for loan
    Series available for loan
    Uppsala
    Associated volumes
    Call number: SR 93.0768(784)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 51 S.
    ISBN: 9171582347
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 784
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 4
    Call number: SR 93.0768(786)
    In: Radioactive deposits in New Mexico
    Type of Medium: Series available for loan
    Pages: 111 S. + 1 Kt.-Beil.
    ISBN: 9171582401
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 786
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 5
    Call number: SR 93.0768(785)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 202 S.
    ISBN: 9171582398
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 785
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 6
    Call number: SR 93.0768(764)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 79 S. + 1 Kt.-Beil.
    ISBN: 9171581723
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 764
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 7
    Series available for loan
    Series available for loan
    Uppsala
    Associated volumes
    Call number: SR 93.0768(782)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 52, A-54 S.
    ISBN: 9171582320
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 782
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 8
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(42)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 238 S.
    Series Statement: Smithsonian contributions to paleobiology 42
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 9
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(46)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 27 S.
    Series Statement: Smithsonian contributions to paleobiology 46
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 10
    Call number: SR 90.0088(39)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: IV, 102 S.
    Series Statement: Smithsonian contributions to paleobiology 39
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 11
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(41)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: IV, 43 S.
    Series Statement: Smithsonian contributions to paleobiology 41
    Language: English
    Location: Lower compact magazine
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  • 12
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(87)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 34 S.
    Series Statement: Smithsonian contributions to paleobiology 87
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 13
    Call number: SR 90.0088(86)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 59 S.
    Series Statement: Smithsonian contributions to paleobiology 86
    Language: English
    Location: Lower compact magazine
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  • 14
    Call number: SR 90.0939(9)
    In: Report
    Type of Medium: Series available for loan
    Pages: 9 S.
    Series Statement: Report / University of Uppsala, Institute of Geophysics 9
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 15
    Call number: SR 90.0939(14)
    In: Report
    Type of Medium: Series available for loan
    Pages: 23, A-3 S.
    Series Statement: Report / University of Uppsala, Institute of Geophysics 14
    Language: English
    Location: Lower compact magazine
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  • 16
    Call number: SR 90.1028(13)
    In: Smithsonian contributions to the earth sciences
    Type of Medium: Series available for loan
    Pages: III, 40 S.
    Series Statement: Smithsonian contributions to the earth sciences 13
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 17
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.1028(23)
    In: Smithsonian contributions to the earth sciences
    Type of Medium: Series available for loan
    Pages: III, 50 S.
    Series Statement: Smithsonian contributions to the earth sciences 23
    Language: English
    Location: Lower compact magazine
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  • 18
    Call number: SR 90.1028(8)
    In: Smithsonian contributions to the earth sciences
    Type of Medium: Series available for loan
    Pages: IV, 88 S.
    Series Statement: Smithsonian contributions to the earth sciences 8
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 19
    Monograph available for loan
    Monograph available for loan
    Uppsala
    Call number: M 329
    Type of Medium: Monograph available for loan
    Pages: 6 S.
    Language: English
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 20
    Call number: SR 93.0768(788)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 66 S.
    ISBN: 9171582495
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 788
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 21
    Call number: SR 93.0768(792)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 17 S.
    ISBN: 9171582584
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 792
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 22
    Call number: SR 93.0768(778)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 105 S. + 1 Kt.-Beil.
    ISBN: 9171582215
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 778
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 23
    Call number: SR 93.0768(796)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 79 S. + 1 Beil.
    ISBN: 9171582754
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 796
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 24
    Call number: SR 93.0768(795)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 43 S. + 1 Kt.-Beil.
    ISBN: 9171582681
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 795
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 25
    Series available for loan
    Series available for loan
    Uppsala
    Associated volumes
    Call number: SR 93.0768(799)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 51 S.
    ISBN: 9171582789
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 799
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 26
    Call number: SR 93.0768(800)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 45 S.
    ISBN: 917158286X
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser : 800
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 27
    Call number: SR 93.0768(787)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 40 S.
    ISBN: 9171582444
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 787
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 28
    Call number: SR 93.0768(794)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 288 S.
    ISBN: 9171582673
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 794
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 29
    Series available for loan
    Series available for loan
    Uppsala
    Associated volumes
    Call number: SR 93.0768(804)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 82 S.
    ISBN: 9171583092
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 804
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 30
    Call number: SR 93.0768(798)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 49 S.
    ISBN: 9171582770
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 798
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 31
    Call number: SR 93.0768(776)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 13 S.
    ISBN: 9171582193
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 776
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 32
    Call number: SR 93.0768(777)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 28 S.
    ISBN: 9171582207
    Series Statement: Sveriges geologiska undersökning : Serie C, Avhandlingar och uppsatser 777
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 33
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(44)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: IV, 35 S.
    Series Statement: Smithsonian contributions to paleobiology 44
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 34
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(3)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: XIV, 390 S.
    Series Statement: Smithsonian contributions to paleobiology 3
    Language: English
    Location: Lower compact magazine
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  • 35
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(8)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 51 S.
    Series Statement: Smithsonian contributions to paleobiology 8
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 36
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(9)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: 256 S.
    Series Statement: Smithsonian contributions to paleobiology 9
    Language: English
    Location: Lower compact magazine
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  • 37
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(10)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 242 S.
    Series Statement: Smithsonian contributions to paleobiology 10
    Language: English
    Location: Lower compact magazine
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  • 38
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(11)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 25 S.
    Series Statement: Smithsonian contributions to paleobiology 11
    Language: English
    Location: Lower compact magazine
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  • 39
    Call number: SR 90.0088(47)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: IV, 35 S.
    Series Statement: Smithsonian contributions to paleobiology 47
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 40
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(48)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 65 S.
    Series Statement: Smithsonian contributions to paleobiology 48
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 41
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(50)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: IX, 445 S.
    Series Statement: Smithsonian contributions to paleobiology 50
    Language: English
    Location: Lower compact magazine
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  • 42
    Call number: SR 93.0767(51)
    In: Sveriges geologiska undersökning. Serie Ca, Avhandlingar och uppsater
    Type of Medium: Series available for loan
    Pages: 28 S.
    ISBN: 917158238X
    Series Statement: Sveriges geologiska undersökning : Ser. Ca, Avhandlingar och uppsatser 51
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 43
    Series available for loan
    Series available for loan
    Uppsala
    Associated volumes
    Call number: SR 93.0768(779)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 31 S.
    ISBN: 9171582223
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 779
    Language: English
    Location: Lower compact magazine
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  • 44
    Call number: SR 93.0768(773)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 48 S.
    ISBN: 9171581995
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 773
    Language: English
    Location: Lower compact magazine
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  • 45
    Call number: SR 93.0768(805)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 35 S.
    ISBN: 9171583122
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 805
    Language: English
    Location: Lower compact magazine
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  • 46
    Call number: SR 93.0768(806)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 31 S.
    ISBN: 9171583130
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 806
    Language: English
    Location: Lower compact magazine
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  • 47
    Call number: SR 93.0768(774)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 66 S. + 1 Kt.-Beil.
    Series Statement: Sveriges geologiska undersökning : Serie C, Avhandlingar och uppsatser 774
    Language: English
    Location: Lower compact magazine
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  • 48
    Call number: SR 93.0768(790)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 81 S.
    ISBN: 9171582568
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 790
    Language: English
    Location: Lower compact magazine
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  • 49
    Call number: SR 93.0768(797)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 34 S.
    ISBN: 9171582762
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 797
    Language: English
    Location: Lower compact magazine
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  • 50
    Call number: SR 93.0768(789)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 41 S.
    ISBN: 9171582509
    Series Statement: Sveriges geologiska undersökning : Ser. C, Avhandlingar och uppsatser 789
    Language: English
    Location: Lower compact magazine
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  • 51
    Call number: SR 93.0768(829)
    In: Sveriges Geologiska Undersökning
    Type of Medium: Series available for loan
    Pages: 24 S.
    ISBN: 917158580X
    Series Statement: Sveriges geologiska undersökning : Ser. C, Research papers 829
    Language: English
    Location: Lower compact magazine
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  • 52
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(16)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: 43 S.
    Series Statement: Smithsonian contributions to paleobiology 16
    Language: English
    Location: Lower compact magazine
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  • 53
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(17)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: IV, 51 S.
    Series Statement: Smithsonian contributions to paleobiology 17
    Language: English
    Location: Lower compact magazine
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  • 54
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(5)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: 53 S.
    Series Statement: Smithsonian contributions to paleobiology 5
    Language: English
    Location: Lower compact magazine
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  • 55
    Call number: SR 90.0088(12)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: IV, 138 S.
    Series Statement: Smithsonian contributions to paleobiology 12
    Language: English
    Location: Lower compact magazine
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  • 56
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(55)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: VI, 336 S.
    Series Statement: Smithsonian contributions to paleobiology 55
    Language: English
    Location: Lower compact magazine
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  • 57
    Series available for loan
    Series available for loan
    Washington, DC : Smithsonian Institution Press
    Associated volumes
    Call number: SR 90.0088(49)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 69 S.
    Series Statement: Smithsonian contributions to paleobiology 49
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 58
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    Washington, DC : Smithsonian Institution Press
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    Call number: SR 90.0088(80)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 611 S.
    Series Statement: Smithsonian contributions to paleobiology 80
    Language: English
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  • 59
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    Washington, DC : Smithsonian Institution Press
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    Call number: SR 90.0088(45)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 45 S.
    Series Statement: Smithsonian contributions to paleobiology 45
    Language: English
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  • 60
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    Washington, DC : Smithsonian Institution Press
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    Call number: SR 90.0088(83)
    In: Smithsonian contributions to paleobiology
    Type of Medium: Series available for loan
    Pages: III, 37 S.
    Series Statement: Smithsonian contributions to paleobiology 83
    Language: English
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  • 61
    Call number: SR 90.0939(18)
    In: Report
    Type of Medium: Series available for loan
    Pages: 23 S.
    Series Statement: Report / University of Uppsala, Institute of Geophysics 18
    Language: English
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  • 62
    Call number: SR 90.0939(8)
    In: Report
    Type of Medium: Series available for loan
    Pages: 7 S.
    Series Statement: Report / University of Uppsala, Institute of Geophysics 8
    Language: English
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  • 63
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    Washington, DC : Smithsonian Institution Press
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    Call number: SR 90.1028(5)
    In: Smithsonian contributions to the earth sciences
    Type of Medium: Series available for loan
    Pages: IV, 53 S.
    Series Statement: Smithsonian contributions to the earth sciences 5
    Language: English
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  • 64
    Call number: SR 90.1028(10)
    In: Smithsonian contributions to the earth sciences
    Type of Medium: Series available for loan
    Pages: III, 39 S.
    Series Statement: Smithsonian contributions to the earth sciences 10
    Language: English
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  • 65
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-82/27
    In: CRREL Report, 82-27
    Description / Table of Contents: Recommendations for economical thicknesses for building insulation result from a study of fuel and construction costs of 12 military installations in Alaska. A comparison between the insulation thickness that a building owner might choose today and what he might choose in 20 years indicates a trend for much thicker insulation in the future. An analysis of how much more expensive a building built today with the thickness that would be appropriate 20 years hence indicates only a small penalty in life-cycle costs for the additional insulation. Therefore, a minimum of R-32 walls and R-62 attics is recommended for most of Alaska.
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    Pages: 54 Seiten , Illustrationen
    Series Statement: CRREL Report 82-27
    Language: English
    Note: CONTENTS Abstract Preface Conversion factors Summary Introduction Determining economic thicknesses for insulation Background Analysis method for new construction Analysis method for reinsulating existing construction Sensitivity and longevity of the results Sensitivity Longevity Recommendations Saving money vs. saving energy Energy economics conservation Building energy performance standards Conclusion Literature cited Appendix A: Heating system costs Appendix B: Present worth factors Appendix C: Base case and incremental thermal properties Appendix D: LCC comparison graphs for wall and roof systems Appendix E: Cost penalties for energy conservatism Appendix F: Graphic aid for figuring energy savings thermal improvements
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  • 66
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-82/29
    In: CRREL Report, 82-29
    Description / Table of Contents: Ice grains in a snow cover with a low temperature gradient assume a well-rounded equilibrium form. However, at temperature gradients of 0.1 to 0.2 C/cm (depending somewhat on temperature and snow density), the rounded grains recrystallize into a faceted kinetic growth form. The large temperature gradient must play a decisive role in moving the vapor fast enough to sustain the rapid growth rate associated with the kinetic growth form. Once the large temperature gradient is removed, the grains recrystallize back to the equilibrium form. the recrystallization occurs in either direction without a change in bulk density. The growth of faceted crystals begins at the warmer base of the snow cover where the excess vapor pressure is largest. A transition between the overlying rounded grains moves upward in time. Faceted crystals also grow just below crusts of reduced permeability, where the increased vapor accumulation can sustain the excess vapor pressure neded for kinetic growth. The heat and vapor flows are described using a model based on thermodynamic equilibrium. The temperature distribution is shown to be quasi-linear at steady state in homogeneous snow. The recrystallization of the snow is modeled using the rounded grains as sources and the faceted grains as sinks. In the future this model should be extended to account for different temperatures among the sources and sinks.
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    Pages: 27 Seiten , Illustrationen
    Series Statement: CRREL Report 82-29
    Language: English
    Note: Contents: Abstract Preface Introduction Vapor flow Temperature profile Crystal growth rates Equilibirum versus kinetic growth forms of snow crystals Discussion Summary Literature cited
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  • 67
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-82/34
    In: CRREL Report, 82-34
    Description / Table of Contents: The ice discharge through an opening in an ice control structure was documented to be a function of the floe size, ice type, ice floe conditions and vessel direction. The model data for the average ice discharge per vessel transit scaled to prototype values compared favorably with data taken at the St. Marys River ice control structure (ICS). The model results of the force measurements were also consistent with data taken at the St. Marys ICS. The dynamic loading conditions were independent of vessel direction. The dynamic loading to the structure using 3 types of ice (plastic, natural and urea-doped) showed a considerable difference in their means and standard deviations. The urea-doped ice was evaluated for dynamic loading conditions, and reasonable peak values of 3 to 5 times the mean load at each measuring position were recorded, independent of vessel direction. It appears that synthetic random ice floes may be used in model studies where ice discharge through an opening in a structure needs to be documented. This study shows the synthetic random ice floe discharge to fall reasonably within the values obtained for natural ice discharge for both rafted and non-rafted ice fields above the ICS. However, the question of whether synthetic ice can be used for analyzing force distributions and dynamic force loading criteria cannot be fully answered at this time because the load distributions of the synthetic and natural floes appear to differ.
    Type of Medium: Series available for loan
    Pages: 68 Seiten , Illustrationen
    Series Statement: CRREL Report 82-34
    Language: English
    Note: CONTENTS Abstract Preface Introduction Scope of work Ice discharge from Lake Huron into St. Clair River Water velocity profiles at Port Huron Ice conditions Physical model Basis for selection Description Instrumentation Model ice control structure Open water calibration Open water tests Experimental procedures and techniques Ice cover calibration Ice control structure orientation Analysis of ice discharge due to ship transits Natural ice Synthetic ice Forces on the ice control structure Static measurements Dynamic force measurements Potential additional shear stresses Anticipated ice conditions with ICS Conclusions Literature cited Appendix A. Application of model results Appendix B. Suggested additional studies Appendix C. Derivation of ice discharge
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  • 68
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-83/19
    In: CRREL Report, 83-19
    Description / Table of Contents: Small-scale laboratory experiments were conducted on model bridge piers in the CRREL test basin. The experiments were performed by pushing model ice sheets against structures and monitoring the ice forces during the ice/structure interaction. The parameters, varied during the test program, were the geometry of the bridge piers and the velocity, thickness, and flexural strength of the ice. The results are presented in the form of ice forces on sloping and vertical structures with different geometries. During ice action on sloping structures, a phenomenon of transition of failure mode from bending to crushing was observed as the ice velocity was steadily increased.
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    Pages: 17 Seiten , Illustrationen
    Series Statement: CRREL Report 83-19
    Language: English
    Note: CONTENTS Abstract Preface Introduction Tests Results Ice forces on inclined structures Transition of ice action due to velocity increase Aspect ratio Bridge pier nose geometry Conclusions Literature cited
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  • 69
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-83/18
    In: CRREL Report, 83-18
    Description / Table of Contents: An evaluation of an impulse radar system for detecting cavities under concrete pavement is discussed, and field results are presented. It was found that a dual antenna mode of surveying was ideal for void detection. In this mode one antenna operated in a transceive mode and a second, offset from the first, operated in a receive-only mode. This arrangement allowed a refraction-type profile survey to be performed, which enabled subpavement voids to be easily detected. Field trails were held at Plattsburgh Air Force Base, where 28 cavities were detected and mapped. Drilling of holes verified that a cavity existed and allowed cavity depth to be measured. The cavities varied from 1.5 in. to 23 in, depth and were up to 20 ft. long.
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    Pages: 49 Seiten , Illustrationen
    Series Statement: CRREL Report 83-18
    Language: English
    Note: CONTENTS Abstract Preface Introduction Plattsburgh Air Force Base Radar sounding system Survey procedure Cavity inspection Radar cavity detection test Radar profile results Falling-weight deflectometer tests Discussion and conclusions Literature cited
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  • 70
    Call number: ZSP-201-83/21
    In: CRREL Report, 83-21
    Description / Table of Contents: The probability density function of the gouge depths into the sediment is represented by a simple negative exponential over four decades of gouge frequency. The exceedance probability function is, therefore, e to the -lambda d, where d is the gouge depth in meters and lambda is a constant. The value of lambda shows a general decrease with increasing water depth, from 9/m in shallow water to less than 3/m in water 30 to 35 m deep. The deepest gouge observed was 3.6 m, from a sample of 20,354 gouges that have depths greater than or equal to 0.2 m. The dominant gouge orientations are usually unimodal and reasonably clustered, with the most frequent alignments roughly parallel to the general trend to the coastline. The value of N(bar) sub 1, the mean number of gouges (deeper than 0.2 m) per kilometer measured normal to the trend of the gouges, varies from 0.2 for protected lagoons to 80 in water between 20 and 38 m deep in unprotected offshore regions. The distribution of the spacings between gouges as measured along a sampling track is a negative exponential. The form of the frequency distribution of N sub 1 varies with water depth and is exponential for lagoons and shallow offshore areas, previously skewed for 10 to 20 m depths off the barrier islands, and near-normal for deeper water. As a Poisson distribution gives a reasonable fit to the N sub 1 distributions for all water depths, it is suggested that gouging can be taken as approximating a Poisson process in both space and time. The distributions of the largest values per kilometer of gouge depths, gouge widths, and the heights of the lateral embankment of sediments plowed from the gouges are also investigated.
    Type of Medium: Series available for loan
    Pages: 40 Seiten , Illustrationen, 1 Karte
    Series Statement: CRREL Report 83-21
    Language: English
    Note: CONTENTS Abstract Preface Introduction Background and environmental setting Data collection and terminology Data analysis Gouge depths Gouge orientation Gouge frequency Extreme value analysis Applications to offshore design Gouge depth Extreme value statistics Burial depths Conclusion Literature cited Appendix A: Detailed bathymetric map of the Alaskan portion of the Beaufort Sea
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  • 71
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-83/13
    In: CRREL Report, 83-13
    Description / Table of Contents: A review on past experimental and theoretical work indicates a need for additional experimentation to characterize the response of snow to inelastic pressure waves. Pressure data from previously conducted explosion tests are analyzed to estimate the elastic limit of snow of 400 -kg/cu m density to be about 36 kPa. This pressure corresponds to a scaled distance of 1.6 m/cu.rt.kg for charges fired beneath the surface of the snow, and to a scaled distance of 1.2 m/cu.rt.kg for charges fired in the air. The effects of a snow cover on the method of clearing a minefield by using an explosive charge fired in the air above the snow surface are also discussed and recommendations are given for further work in this area. Explosive pressure data are used to estimate the maximum effective scaled radius for detonating buried mines at shallow depth to be 0.8 m/cu.rt.kg. Fuel-air explosive will increase this effective radius significantly because of the increase in the size of the source region.
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    Pages: 33 Seiten , Illustrationen
    Series Statement: CRREL Report 83-13
    Language: English
    Note: CONTENTS Abstract Preface List of symbols Introduction Objectives Background Problems in describing the response of snow to an applied stress Methods of determining the dynamic behavior of materials Review of previous studies on snow Experimental measurements on snow Summary of snow experiments Theoretical studies Confirmation of the theory Discussion Applications Recommendations Summary Literature cited Appendix A. Selected data from Wisotski and Snyder (1966) Appendix B. Pressure data from Livingston (1964)
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  • 72
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    Call number: ZSP-201-83/12
    In: CRREL Report, 83-12
    Description / Table of Contents: This paper documents the development and verification of two finite difference models that solve the general two-dimensional form of the heat conduction equation, using the alternative-direction implicit method. Both can handle convective, constant flux, specified temperature and semi-infinite boundaries. The conducting medium may be composed of many materials. The first program, ADI, solves for the case where no change of state occurs. ADIPC solves for case where a freeze/thaw change of phase may occur, using the apparent heat capacity method. Both models are verified by comparison to analytical results.
    Type of Medium: Series available for loan
    Pages: 74 Seiten , Illustrationen
    Series Statement: CRREL Report 83-12
    Language: English
    Note: CONTENTS Abstract Preface Introduction Finite differences applied to heat transfer Heat conduction equation Boundary conditions Phase change Computer program ADDATA, the data subroutine TRIDIG, the matrix solver ISOTHM, the isotherm finider ADI, main program ADEPC, main program Verification of ADI Comparison of ADI with analytical results Comparison of ADI with experimental results Verification of ADIPC Comparison of ADIPC with analytical results-the Neumann solution Comparison of ADIPC with analytical results-two-dimensional phase change verification User instruction for ADI User instruction for ADIPC Conclusions Literature cited Appendix A. Program INFSUM and sample input and output for program ADI Appendix B. Program ADIPC and sample input and output
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  • 73
    Call number: ZSP-201-83/14
    In: CRREL Report, 83-14
    Description / Table of Contents: An analysis of ice fracture that incorporates dislocation mechanics and linear elastic fracture mechanics is discussed. The derived relationships predict a brittle to ductile transition in polycrystalline ice under tension with a Hall-Petch type dependence of brittle fracture strength on grain size. A uniaxial tensile testing technique, including specimen preparation and loading system design was developed and employed to verify the model. The tensile strength of ice in purely brittle fracture was found to vary with the square root of the reciprocal of grain size, supporting the relationship that the theory suggests. The inherent strength of the ice lattice and the Hall-Petch slope are evaluated and findings discussed in relation to previous results. Monitoring of acoustic emissions was incorporated in the tests, providing insights into the process of microfracture during ice deformation.
    Type of Medium: Series available for loan
    Pages: 43 Seiten , Illustrationen
    Series Statement: CRREL Report 83-14
    Language: English
    Note: CONTENTS Abstract Preface Introduction Background Development of testing technique Test specimens Tensile testing Compression testing Experimental results Tensile tests Compression tests Discussion Conclusions Suggestions for further work Literature cited Appendix A: Additional information on seed grains Appendix B: Thin-sectioning procedure Appendix C: Displacement transducer calibration
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  • 74
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-82/41
    In: CRREL Report, 82-41
    Description / Table of Contents: Many of the important factors influencing the choice of appropriate aquifer test procedures are presented. The concepts of bias, accuracy and spatial variabil­ity are explained. The definitions of a number of aquifer parameters are devel­oped from basic principles demonstrating the underlying assumptions and limita­tions. The parameters considered are: piezometric head, hydraulic conductiv­ity/intrinsic permeability, flow direction, specific discharge magnitude, transmissivity, volumetric flow rate, total porosity, effective porosity, aver­age linear velocity, storage coefficient, specific yield, dispersion coefficient-aquifer dispersivity. For each parameter several techniques are described, evaluated and ranked in terms of perceived potential accuracy, simplicity and value to contaminant transport studies. It must be stressed, however, that the evaluations are based principally upon theoretical grounds, and not upon actual conduct of the described procedures.
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    Pages: iv, 111 Seiten , Illustrationen
    Series Statement: CRREL Report 82-41
    Language: English
    Note: CONTENTS Abstrac Preface Introduction Purpose Scope Concept of accuracy Test selection Definition of parameters Piezometric head Use of piezometers Hydraulic conductivity Flow direction Specific discharge magnitude Transmissivity Volumetric flow rate Porosity Average linear velocity Storage coefficient-specific yield Aquifer dispersivity Parameter estimation techniques Piezometric head Hydraulic conductivity Direction and magnitude of specific discharge vector Transmissivity Volumetric flow rate Total porosity Average linear velocity Storage coefficient Specific yield Effective porosity Aquifer dispersivity-dispersion coefficients Conclusions Literature cited
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  • 75
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-83/16
    In: CRREL Report, 83-16
    Description / Table of Contents: The presence of snow on the ground can impose limitations on the mobility of wheeled and tracked vehicles. Snow depth and density are the two most easily measured snow properties that can be related to mobility over snow. Existing models of snowpack accumulation and ablation processes and models of internal snowpack structure were examined to determine if a model of the snowpack can be developed for use in predicting the snow parameters that affect mobility. Simple models, such as temperature index models, do not provide sufficient snowpack details, and the more detailed models require too many measured inputs. Components of the various models were selected from a basis of a snowpack model for predicting snow properties related to mobility over snow. Methods of obtaining the input data from some components are suggested, and areas where more development is needed are described.
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    Pages: 34 Seiten , Illustrationen
    Series Statement: CRREL Report 83-16
    Language: English
    Note: CONTENTS Abstract Preface Nomenclature Conversion of metric units Introduction Review of existing models Accumulation models Ablation models Using existing models for studying mobility Proposed snowpack model for mobility studies Model components Implementation of the model Developing input data Conclusions Literature cited
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  • 76
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-83/11
    In: CRREL Report, 83-11
    Description / Table of Contents: Investigations of ground radar performance over thawed and seasonally frozen silts, and sands and gravels containing artificial and natural reflectors were carried out in Alaska. The radar emitted 5-10 ns pulses, the center frequency of which was approximately 150 MHz. The artificial reflectors were metal sheets and discs and the natural reflectors were the groundwater table and interfaces between frozen and thawed material. The water table was profiled at three sites where the subsurface material was coarse-grained alluvium. Dielectric constants of 16 to 18 were measured for the thawed silts, 6 to 7 for the frozen silts and 3 to 9 for the sands and gravels. Signal penetration in the thawed high moisture content silts may be achieved only by use of a lower frequency radar, whereas in the sands and gravels greater depths may be detected with more sophisticated signal processing.
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    Pages: 16 Seiten , Illustrationen
    Series Statement: CRREL Report 83-11
    Language: English
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  • 77
    Call number: ZSP-201-83/22
    In: CRREL Report, 83-22
    Description / Table of Contents: A new experimental method for measuring the soil-water diffusivity of frozen soil under isothermal conditions is introduced. The theoretical justification of the method is presented and the feasibility of the method is demonstrated by experiments conducted using marine-deposited clay. The measured values of the soil-water diffusivity are found comparable to reported experimental data.
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    Pages: 13 Seiten , Illustrationen
    Series Statement: CRREL Report 83-22
    Language: English
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  • 78
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-83/25
    In: CRREL Report, 83-25
    Description / Table of Contents: Ice action on two cylindrical and conical structures, located side by side, was investigated in a small-scale experimental study to determine the interference on the ice forces generated during ice-structure interaction. The proximity of the two structures changes the mode of ice failure, the magnitude and direction of ice forces on the individual structure, and the dominant frequency of ice force variations. Interference effects were determined by comparing the experimental results of tests at different structure spacings.
    Type of Medium: Series available for loan
    Pages: 42 Seiten , Illustrationen
    Series Statement: CRREL Report 83-25
    Language: English
    Note: CONTENTS Abstract Preface Nomenclature Introduction Experimental setup and procedure Results and discussion Cylindrical structures Conical structures Conclusions Literature cited Appendix A: Relationship between flexural strength and in-situ unconfined compressive strength Appendix B: Test data
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  • 79
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    Call number: ZSP-201-83/17
    In: CRREL Report, 83-17
    Description / Table of Contents: A sea ice model was applied to the East Greenland Sea to examine a 60-day ice advance period beginning 1 October 1979. This investigation compares model results using driving geostrophic wind fields derived from three sources. Winds calculated from sea-level pressures obtained from the National Weather Service's operational analysis system resulted in strong velocities concentrated in a narrow band adjacent to the Greenland coast, with moderate velocities elsewhere. The model showed excessive ice transport and thickness build-ups in the coastal region. The extreme pressure gradient parallel to the coast resulted partially from a pressure reduction procedure that was applied to the terrain-following sigma coordinate system to obtain sea-level pressures. Additional sea-level pressure fields were obtained from an independent optimal interpolation analysis that merged FGGE buoys drifting in the Arctic basin with high latitude land stations and from manual digitization of the NWS hand-analyzed Northern Hemisphere Surface Charts. Modeling results using winds from both of these fields agreed favorably.
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    Pages: 19 Seiten , Illustrationen
    Series Statement: CRREL Report 83-17
    Language: English
    Note: CONTENTS Abstract Preface Introduction Description of study Model results The problem Conclusions Literature cited
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  • 80
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-84/18
    In: CRREL Report, 84-18
    Description / Table of Contents: This report investigates the influences of turbulence and water temperature on frazil ice formation. The rate and thequantity of frazil ice formed in a specified volume of supercooled water increase with both increasing turbulence inten-sitv and decreasing water temperature. The influence of turbulence intensity on the rate of frazil ice formation, how-ever. is more pronounced for larger initial supercooling. The turbulence characteristics of a flow affect the rate offrazil ice formation by governing the temperature to which the flow can be supercooled, by influencing heat transferfrom the frazil ice to surrounding water, and by promoting collision nucleation, particle and floc rupture and increasingthe number of nucleation sites. larger frazil ice particles formed in water supercooled to lower temperatures. The par-ticles usually were disks, with diameters several orders greater than their thickness. Particle size generally decreased with increasing turbulence intensity. This report develops an analytical model, in which the rate of frazil ice formation isrelated to temperature rise of a turbulent volume of water from the release of latent heat of fusion of liquid water toice. Experiments conducted in a turbulence jar with a heated, vertically oscillating grid served both to guide and tocalibrate thanalytical'model as well as to afford insights into frazil ice formation. The formation of frazil ice wasstudied for Vemperatures of supercooled water ranging from -0.9° to -0.050°C.
    Type of Medium: Series available for loan
    Pages: vi, 50 Seiten , Illustrationen
    Series Statement: CRREL Report 84-18
    Language: English
    Note: CONTENTS Abstract Preface Nomenclature Introduction Background Scope of study Literature review Introduction Incipient formation of frazil ice Particle size and evolution of frazil ice Influences of turbulence and water temperature on the rate of frazil ice formation Conclusions Analytical model Introduction Elements of heat transfer Elements of turbulence Experimentation Experimental apparatus Experimental procedure Results Introduction Nucleation of frazil ice Influences of turbulence on frazil ice formation Water temperature Influences of water temperature and turbulence on the concentration of frazil ice Frazil ice particle shape and size Conclusions Literature cited Appendix A: Preliminary frazil ice experiments Flume experiments Couette-flow Appendix B: Listing of computer program for calculation of frazil ice formation Appendix C: Water temperature rise attributable to frazil ice formation as computed usingthe analytical model .
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  • 81
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    Call number: ZSP-201-84/15
    In: CRREL Report, 84-15
    Description / Table of Contents: Measurements of meltwater pH from annual layers of South Pole firn and ice samples ranging in age from 40 to 2000 years B.P. show that precipitation at this remote site has a higher natural acidity than that expected from atmospheric equilibrium with CO2. The average pH of deaerated (CO2-free) samples was 5.64 + or - 0.08, while air-equilibrated samples averaged 5.37 + or - 0.008, a pH that is about a factor of two more acidic than the expected background pH of 5.65. The observed 'excess' acidity can be accounted for by natural SO4(2)- and NO(3)- levels in the samples probably originating from non-anthropogenic H2SO4 and HNO3. Because of the presence of these naturally occurring acids in South Pole precipitation, a pH of 5.4 is considered a more representative baseline reference pH for acid precipitation studies.
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    Pages: ii, 12 Seiten , Illustrationen
    Series Statement: CRREL Report 84-15
    Language: English
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  • 82
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-84/12
    In: CRREL Report, 84-12
    Description / Table of Contents: Icing on stationary structures such as oil rigs is becoming an increasingly serious problem as offshore drilling operations in the subpolar regions become more common. Little information exists on this subject. Extensive observations have been made of icing on the upper structures of moving ships, but the complexity of this problem makes analysis of the results very difficult. Even the generation of water drops in this case involves many factors, such as windspeed, wave direction relative to the bearing of the ship, and size and free-board of the ship. On stationary structures, however, the problem is much simpler, since the major factor in drop generation is whitecaps produced by wind, and no motion of the structure is involved. In the present study, a theoretical calculation was made by combining the data available on the generation of drops by wind with data on the proportion of ice frozen from the collected water. The rate of ice accumulation on stationary structures was calculated using published data. The results were compared with icing measured on board ships. Although the general trend of this calculation indicated parallelism with the onboard measurements, the measured ice accumulation rate on ships needed a 5 to 8 m/s higher windspeed to correspond with the calculated rate for stationary structures.
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    Pages: ii, 13 Seiten , Illustrationen
    Series Statement: CRREL Report 84-12
    Language: English
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  • 83
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    Call number: ZSP-201-84/11
    In: CRREL Report, 84-11
    Description / Table of Contents: Data obtained from two sets of data buoys either air-dropped or deployed by ship onto the Weddell Sea pack ice during the period from Dec 1978 to Nov 1980 are presented. The buoy data include position, pressure and temperature information and to date represent the most complete combined weather and pack ice drift records for the ice-covered Southern Ocean regions. The buoys tended to drift north initially and then to turn east generally between latitudes 62°S and 64°S. Buoy 1433 turned east farther south at approximately 67°S but at about the same time as buoy 0527, implying that the westerly wind belt was farther south than usual in 1979. The range of air pressures-from about 950 mb to about 1020 mb is typical of the circumpolar low pressure trough in the Southern Hemisphere. All buoys were equipped with an internal or compartment temperature sensor. The 1980 buoys also contained an external air temperature sensor in a ventilated, shielded can at 1-m height. Although differences of 10°C or more between recorded air and compartment temperatures are common, the correlation between the two measured temperatures is generally very good. The compartment temperatures are higher probably because the buoy is radiationally heated. We found that subtracting 3°C from the average daily compartment temperature yielded a good estimate of the average air temperature for any given day. This technique can be used to construct average daily air temperature records for the 1979 buoys which only contained the internal or compartment temperature sensor.
    Type of Medium: Series available for loan
    Pages: v, 21 Seiten , Illustrationen
    Series Statement: CRREL Report 84-11
    Language: English
    Note: CONTENTS Abstract Preface Introduction Methods and instrumentation Results Drift tracks Pressure data Temperature data Discussion Conclusions Literature cited
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  • 84
    Call number: ZSP-201-84/9
    In: CRREL Report, 84-9
    Description / Table of Contents: This report presents the results of the first phase of a test program designed to obtain a comprehensive understanding of the mechanical properties of multi-year sea ice from the Alaskan Beaufort Sea. In Phase I, 222 constant-strain-rate uni-axial compression tests were performed on ice samples from ten multi-year pressure ridges to examine the magnitude and variation of ice strength within and between pressure ridges. A limited number of constant-strain-rate compression and tension tests, constant-load compression tests, and conventional triaxial tests were also performed on ice samples from a multi-year floe to provide preliminary data for developing ice yield criteria and constitutive laws for multi-year sea ice. Data are presented on the strength, failure strain, and modulus of multi-year sea ice under different loading conditions. The statistical variation of ice strength within and between pressure ridges is examined, as well as the effects of ice temperature, porosity, structure, strain rate and confining pressure on the mechanical properties of multi-year sea ice.
    Type of Medium: Series available for loan
    Pages: v, 107 Seiten , Illustrationen
    Series Statement: CRREL Report 84-9
    Language: English
    Note: CONTENTS Abstract Preface Introduction Field Sampling Site selection and description Ice sampling procedures Shipping and storage of ice samples Testing Techniques Multi-year Pressure Ridge Tests Ice description Sampling scheme and test variables Uniaxial compressive strength Residual compressive strength Failure strains Initial tangent modulus Statistical Variations in Ice Strength Differences in strength above and below level ice Sources of the variation in strength Shape of the strength histograms Multi-year Floe Ice Tests Ice description Uniaxial compressive strength Constant-load compression tests Constant-strain-rate tension tests Triaxial tests Conclusions Literature Cited Appendix A: Structural profile of a multi-year pressure ridge core Appendix B: Ridge uniaxial compression test data Appendix C: Structural profile of the continuous multi-year floe core Appendix D: Multi-year floe test data
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  • 85
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-83/5
    In: CRREL Report, 83-5
    Description / Table of Contents: This report presents the results of dynamic ice-structure interaction model tests conducted at the CRREL Ice Engineering Facility. A flexible, single-pile, bottom-founded offshore structure was simulated by a test pile with about a one-to-ten scale ratio. Urea (instead of sodium chloride) was used as dopant to scale down the ice properties, resulting in good model ice properties. Six ice fields were frozen and 18 tests carried out. In all cases distinctive dynamic ice structure interaction vibrations appeared, from which abundant data were collected. In tests with linear ice velocity sweep, sawtooth-shaped ice force fluctuations occurred first. With increasing velocity the natural modes of the test pile were excited, and shifts from one mode to another occurred. The maximum ice force values appeared mostly with low loading rates, but high forces appeared random'y at high ice velocities. As a general trend, ice force maximums, averages and standard deviations decreased with increasing ice velocities. The aspect ratio effect of the ice force in continuous crushing follows the same dependence as in static loadings. The frequency of observed ice forces is strongly dominated by the natural modes of the structure. Dynamically unstable natural modes tend to make the developing ice force frequencies the same as the natural frequencies. Otherwise the resulting frequency depends directly on structural stiffness and ice velocity and inversely on the ice force range. During vibrations the displacement rates of the structure overcome the velocity of ice, making low loading rates and hence high ice forces possible. During crushing, ice induces both positive and negative damping.
    Type of Medium: Series available for loan
    Pages: iv, 53 Seiten , Illustrationen
    Series Statement: CRREL Report 83-5
    Language: English
    Note: CONTENTS Abstract Preface Introduction Test arrangements Ice properties Crushing patterns Maximum ice force vs velocity Dynamic aspect ratio effect and crushing strength Measured ice force frequencies Calculated ice force frequencies Accelerations, velocities and displacements Damping Ice-induced negative damping Limit cycles Buckling load Conclusions Literature cited
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  • 86
    Call number: ZSP-201-83/32
    In: CRREL Report, 83-32
    Description / Table of Contents: Ice forces on a bridge pier in the Ottauquechee River, in Quechee, Vermont, were measured by installing fourpanels-each capable of measuring forces in the normal and tangential direction - on both sides of a vertical V-shaped pier nose. The measured forces are presented for a short period during an ice run. After the ice run, the thickness and sizes of the ice floes were measured and the compressive strength of the ice was determined in the laboratory from the ice samples collected along the river banks. The water level measurements made at several locations along theriver are also presented for the period of the ice run.
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    Pages: ii, 8 Seiten , Illustrationen
    Series Statement: CRREL Report 83-32
    Language: English
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  • 87
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    Call number: ZSP-201-84/3
    In: CRREL Report, 84-3
    Description / Table of Contents: The results of resistance tests in level ice and broken ice channels are presented for two models of the WTGB 140-fticebreaker at scales of 1:10 and 1:24, respectively. No scale effect on the resistance in level ice could be detected between the two models. From the test results an empirical predictor equation for the full scale ice resistance is derived. Predicted resistance is compared against, and found to be 25 to 40% larger than, available full-scale values estimated from thrust measurements during full-scale trials of the Great Lakes icebreaker Katmai Bay.
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    Pages: v, 25 Seiten , Illustrationen
    Series Statement: CRREL Report 84-3
    Language: English
    Note: COTENTS Abstract Preface Nomenclature Introduction Model characteristics and test conditions Ice-hull coefficient of friction Measurements of ice properties Experimental procedures Data acquisition system Test program and procedures for 1:10 model Test program and procedures for 1:24 model Analysis of test results Comparison of test results between 1:10 and 1:24 models Analysis of tests in broken or brash-filled ice channels Analysis of tests in level ice Full-scale prediction of level ice resistance Conclusions Literature cited
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  • 88
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    Call number: ZSP-201-80/8
    In: CRREL Report, 80-8
    Description / Table of Contents: This report presents the results of the tests on the new U.S. Coast Guard 140-ft icebreaker Katmai Bay (WTGB-101) in the level plate ice and brash ice in Whitefish Bay and the St. Marys River. The results indicate that the vessel can penetrate 22 in. of level freshwater ice with 2-3 in. of snow cover. It can also penetrate up to 48 in. of brash ice in a continuous mode and at least 30 in. of plate ice by backing and ramming. The installed bubbler system decreased the required power of the vessel from 10 to 30% in brash ice and 25 to 35% in level ice. The low friction coating appears to be effective in decreasing the friction factor when it remains intact; when it peels off it appears to make conditions worse than plain paint. An average dynamic friction factor of 0.15 could be used over the entire hull for these tests.
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    Pages: iv, 28 Seiten , Illustrationen
    Series Statement: CRREL Report 80-8
    Language: English
    Note: CONTENTS Abstract Preface Metric conversion table Introduction Roughness and friction measurements Level plate ice performance Brash ice performance Ramming icebreaking performance Analysis of the data Propulsion efficiency in ice Regression analysis Conclusions and recommendations Literature cited
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  • 89
    Call number: ZSP-201-80/29
    In: CRREL Report, 80-29
    Description / Table of Contents: This study was conducted to determine the short- and long-term physical, chemical and biological effects of spills of hot Prudhoe Bay crude oil on permafrost terrain near Fairbanks, Alaska. Two experimental oil spills, one in winter and one in summer, of 7570 liters (2000 gallons) were made at a forest site. The winter-spill oil moved within the surface moss layer beneath the snow. The summer-spill oil moved primarily below the moss in the organic soil. The oil moved faster and further downslope in the summer spill. Oil in the winter spill stopped during the first day but remobilized and flowed further downslope in the spring. The total area affected by the summer spill was nearly one and one-half times as large as that affected by the winter spill. The initial heat of the spilled oil had little measurable thermal effect on the soil. However, thaw depth significantly increased following two full thaw seasons. The greatest increases occurred beneath oil blackened surfaces. Evaporation of volatile components is the most significant weathering process in the first two years. Volatiles evaporated faster from surface oil than from oil carried deeper into the soil profile. Microbial degradation has not been observed. The indigenous soil microbial populations responded differently to winter and summer oil applications, ranging from inhibition to stimulation, with stimulation appearing to predominate. Vegetation showed both immediate and long-term damage. Damage was greatest near the top of the slope and in areas with surface oil. Deciduous species showed damage faster than evergreen species.
    Type of Medium: Series available for loan
    Pages: vii, 67 Seiten , Illustrationen
    Series Statement: CRREL Report 80-29
    Language: English
    Note: CONTENTS Abstract Preface Summary Introduction Methods Site description Oil application Physical characterization Thermal characterization Oil and oily soil characterization Soil microbiological methodology Vegetation Results and discussion Oil movement Effects on permafrost Compositional changes Microbiological responses Oil effects on vegetation Conclusions Recommendations Literature cited Appendix A Physical and thermal information Appendix B Chemical information Appendix C Microbiological information
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  • 90
    Call number: ZSP-201-80/19
    In: CRREL Report, 80-19
    Description / Table of Contents: During the period 1975-1978 the Federal Highway Administration sponsored a series of environmental engineering in­vestigations along the Yukon River to Prudhoe Bay Haul Road. In 1976 the Department of Energy joined these in­vestigations with a series of ecological projects which continue to the present. Both agencies research efforts were con­ducted on a cooperative basis with CRREL’s in-house research program. The objectives of the research focused on 1) an evaluation of the performance of the road, 2) an assessment of changes in the environment associated with the road, 3) documentation of flora and vegetation along the 577-km-long transect, 4) methodologies for revegetation and restoration, and 5) an assessment of biological parameters as indicators of environmental integrity. In support of these objectives, specific studies were undertaken that investigated the climate along the road, thaw and subsidence beneath and adjacent to the road, drainage and side slope performance, distribution and properties of road dust, vegetation distribution, vegetation disturbance and recovery, occurrence of weeds and weedy species, erosion and its control, revegetation and restoration, and construction of the fuel gas line. This report presents background, information on the region, detailed results of the road thaw subsidence and dust investigations, and summaries of revegetation, fuel gas line, vegetation distribution, soil, and weed studies.
    Type of Medium: Series available for loan
    Pages: xv, 187 Seiten , Illustrationen
    Series Statement: CRREL Report 80-19
    Language: English
    Note: CONTENTS Abstract Preface Summary Introduction Chapter 1. The road and its environment Introduction General physiography Regional climate Surficial and bedrock geology Permafrost and ground ice General biota Vegetation Floristic survey Vegetation mapping Soils and mapping Chapter 2. Roadbed performance and associated investigations Roadbed investigations Roadbed performance Performance of drainage features Performance of sideslopes Conclusions from road, drainage and sideslope performance studies Fuel gas line construction Chapter 3. Distribution and properties of road dust along the northern portion of the Haul Road Introduction Methods Results of wind direction and velocity measurements Dust load and distribution Particle size analyses of dust Chemical composition properties of dust and related samples Soil cation composition Dust impacts on vegetation Discussion and conclusions Chapter 4. Revegetation and restoration investigations Introduction Revegetation approaches Alyeska erosion control and revegetation program Weeds and weedy plants Performance of revegetation Alyeska willow cutting program CRREL restoration experiments Conclusions Revegetation recommendations General report recommendations Literature cited Appendix A: General environmental guidelines applicable to subarctic and arctic road construction Appendix B: University-based studies along the Yukon River-Prudhoe Bay Haul Road Appendix C: CRREL maps of Haul Road showing locations of all study Sites Appendix D: Additional Haul Road cross-sectional profiles Appendix E: Clay mineralogy of road-related materials Appendix F: List of reports in the Joint State/Federal Fish and Wildlife Ad­visory Team series
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  • 91
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-80/16
    In: CRREL Report, 80-16
    Description / Table of Contents: Eight species of loricate choanoflagellates (Acanthoccidae), Acanthoecopsis spiculifera, Bicosta spinifera, Bicosta antennigera, Callicantha simplex, Calliacantha multispina aff., Crinolina aperta, Diaphanoeca multionnulata, and Parvicorbicula socialis, were observed in samples obtained from the Weddell Sea during the austral summer, 1977. D. multiannulata was described for the first time from these samples; the other organisms have either been described previously or are being described at this time. The distribution of most species within the Weddell Sea was widespread. The distributional, environmental, and morphological range of A. spiculifera, B. spinifera, C. aperta, and P. socialis was expanded. Habitats in which choanoflagellates were found included the water column, the edges of ice floes, ponds on ice floes, and the interiors of ice floes. The presence of choanoflagellates within the ice indicates that there may be a closely coupled trophic relationship with the other two biological components of the ice community, the ice algae and the bacteria. The presence in the ice of seven species with both a caudal appendage and anterior projections suggests a positive relationship between this lorica configuration and the ice habitat. Mechanisms of variance of transverse costal diameters between genera may be useful to the taxonomy and phylogeny of this family.
    Type of Medium: Series available for loan
    Pages: vi, 26 Seiten , Illustrationen
    Series Statement: CRREL Report 80-16
    Language: English
    Note: CONTENTS Introduction Literature review Objectives Materials and methods Results Observations Distribution and environmental tolerances Discussion Morphology Distribution Habitat Summary Conclusions Recommendations for future work Literature cited Appendix A Type descriptions of Acanthoecidae collected from the Weddell Sea
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  • 92
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-80/15
    In: CRREL Report, 80-15
    Description / Table of Contents: This report discusses the time constraints on measuring the thermal resistance (R-value) of building components. Temperature changes on either side of a building component perturb measurement accuracy. Long measurement times and measurement times corresponding to a consistent diurnal cycle can be satisfactory; however, individual temperature changes cause significant error for shorter measurement periods. This report shows how to scale the thermal properties of individual constituent materials in a building element to determine its characteristic thermal time constant. The report then demonstrates the size of measurement error resulting from a variety of changes in temperature with representative walls of different time constants.
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    Pages: iii, 30 Seiten , Illustrationen
    Series Statement: CRREL Report 80-15
    Language: English
    Note: CONTENTS Abstract Preface Conversion factors Introduction Field measurement and analysis of transient heat flow A closer look at handling the constraints Random change Step change Ramp change Application of theory Literature cited Appendix A. Percentage error from a step input Appendix B. Time constraints of sample walls Appendix C. Percentage error from a ramp input Appendix D. Percentage error from a sinusoidal input Appendix E. Percentage error programs for a Hewlett-Packard HP-25 calculator Appendix F. Experimental determination of time constants Appendix G. Derivation of time constant formula for multiple layers
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  • 93
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-80/17
    In: CRREL Report, 80-17
    Description / Table of Contents: Construction pads made of snow were used to build two sections of the Trans Alaska Pipeline and a small gas pipeline during the winter of 1975-76. Construction during the winter has become increasingly common in the Arctic. Surface travel and the use of heavy construction equipment on the unprotected tundra have been severely restricted, even during the winter, so the use of temporary winter roads and construction pads built of snow and ice has been advocated and is being adopted. The three snow construction pads mentioned above were the first snow roads and construction pads used on a large scale in Alaska. Snow roads and construction pads have two objectives: to protect the underlying vegetation and upper layers of the ground, and to provide a hard, smooth surface for travel and the operation of equipment. Several types have been built, and a brief discussion is given of their history and classification systems. The three snow construction pads used in construction of the Trans-Alaska Pipeline and the small gas pipeline in 1975-76 were visited and observed while in use. The Globe Creek snow pad, about 50 miles north of Fairbanks, was built primarily of manufactured snow hauled to the site and watered. With very high densities this pad withstood heavy traffic and use by heavy construction equipment except on one steep slope. There, the use of tracked vehicles and vehicles without front wheel drive disaggregated the snow on and near the surface so that vehicles without front wheel drive were unable to climb the hill. The Toolik snow pad, just north of the Brooks Range, was built of compacted snow and proved capable of supporting the heaviest traffic and construction equipment. The fuel gasline snow pad ran from the northern Brooks Range to the Arctic Coast and also proved capable of supporting the necessary traffic. Both the Toolik snow pad and the fuel gasline snow pad failed in very early May because of unseasonably warm and clear weather before the associated construction projects were completed. However, the three snow pads must be considered successful. Common problems were the lack of snow, slopes, unseasonably warm spring weather, and inexperience on the part of contractors and construction personnel.
    Type of Medium: Series available for loan
    Pages: v, 28 Seiten , Illustrationen
    Series Statement: CRREL Report 80-17
    Language: English
    Note: CONTENTS Abstract Preface Introduction History of snow and ice roads Classification of snow and ice roads Snow pads used by Alyeska during the winter of 1975-1976 The Globe Creek snow pad The Toolik snow pad The gasline snow pad Summary and conclusions Literature cited
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  • 94
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-202-121
    In: Research report / Cold Regions Research and Engineering Laboratory, 121
    Description / Table of Contents: Abstract: Stable pressure systems over interior Alaska, sometimes produce prolonged, extreme (below -40°C) cold spells at the surface. The meteorological conditions responsible for two such cold spells are discussed in detail in Appendix A, where it is shown that the rate of radiative cooling of the air is enhanced by suspended ice crystals which are themselves a result of the initial cooling. Radiation fogs formed during the onset of cold spells are generally of short duration because the air soon becomes desiccated. These fogs consist of supercooled water droplets until the air temperature goes below the "spontaneous freezing point" for water droplets (about -40°C); the fog then becomes an ice crystal fog, or simply "ice fog. " During the cooling cycle water is gradually condensed out of the air until the droplets freeze. At this point there is a sharp, discontinuous decrease in the saturation vapor pressure of the air because it must be reckoned over ice rather than over water. The polluted air over Fairbanks allows droplets to begin freezing at the relatively high temperature of -35°C. Between -35 and -40°C the amount of water vapor condensed by freezing of super cooled water droplets is 3 to 5 times greater than the amount condensed by 1°C of cooling at these temperatures. This results in rapid and widespread formation of ice fog (Appendix B) which persists in the Fairbanks area as long as the cold spell lasts. The persistence of Fairbanks ice fog depends on a continual source of moisture (4.1 x 10^6 kg H20 per day) from human activities within the fog. Ice fog crystals are an order of magnitude smaller than diamond dust or cirrus cloud crystals, which in turn are an order of magnitude smaller than common snow crystals (0.01, 0.1 and 1 to 5 mm respectively). The difference in size are shown to result from the differences in cooling rates over five orders of magnitude. Most of the ice fog crystals have settling rates which are smaller than the upward velocity of air over a city center. The upward air movement is caused by convection cells driven by the 6°C "heat island" over Fairbanks. This causes a reduced precipitation rate which permits the density of ice fog in the center center to be three times greater than that in the outlying areas. The inversions which occur during cold spells over Fairbanks begin at ground level and are among the strongest and most persistent in the world. They are three times stronger than those in the inversion layer over Los Angeles. Thus, the low-lying air over Fairbanks stagnates and becomes effectively decoupled from the atmosphere above, permitting high concentrations all pollutants. The combustion of fuel oil, gasoline and coal provides daily inputs of 4.1 x 10^6 kg CO2, 8.6 x 10^3 kg SO2, and 60, 46 and 20 kg of Pb, Br, and Cl respectively, into a lens-like layer of air resting on the surface with a total volume less than 3 x 10^9 m^3. The air pollution over Fairbanks during cold spells is further worsened, because the mechanisms for cleaning the air are virtually eliminated while all activities which pollute the air are increased.
    Type of Medium: Series available for loan
    Pages: v, 118 Seiten , Illustrationen
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory 121
    Language: English
    Note: CONTENTS I. Introduction II. Air pollution Types of air pollution Temperature in versions Low temperature air pollution III. Sources of pollution-water Combustion products Cooling water from power plants · Miscellaneous sources IV. Sources of pollution other than water Electrical conductance and particulates Combustion products Summary V. Economic growth and ice fog VI. General physical properties of ice fog Optical properties Cooling rate of exhaust gases Development of a typical ice fog The effect of freezing droplets on the growth rate of ice fog VII. Structure of the polluted air layer Volume Temperature distribution and convection in Fairbanks air VIII. Mass budget of ice fog Ice fog precipitation rates Density of ice fog Ice fog evaporation rates Use of the mass budget equation Summary of the mass budget IX. Air pollution aspects of ice fog Air pollution Remedial action Ice fog probability Literature cited Appendix A. :The effect of suspended ice crystals on radiative cooling Appendix B. Nucleation and freezing of supercooled water droplets Abstract
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  • 95
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-81/26
    In: CRREL Report, 81-26
    In: Mechanics of cutting and boring, Part 7
    Description / Table of Contents: Abstract: This report deals with force, torque, energy and power in machines such as drills and boring devices, where the cutting head rotates about a central axis while penetrating parallel to that axis. Starting from a cosideration of the forces developed on individual cutting tools, or segments of cutters, the thrust and torque on a complete cutting head is assessed, and simple relationships between thrust and torque are derived. Similarly, the energy and power needed to drive the cutting head arc estimated and related to tool characteristics. Design characteristics of existing machines are compiled and analyzed to give indications of thrust, torque, power, effective tool forces, nominal thrust pressure, power density, and specific energy.
    Type of Medium: Series available for loan
    Pages: iv, 38 Seiten , Illustrationen
    Series Statement: CRREL Report 81-26
    Language: English
    Note: CONTENTS Abstract Preface Foreword Introduction Terminology Tool forces Parallel motion tools Indentation tools Head thrust, thrust per unit width, and nominal head pressure Power and power density Torque Specific energy Efficiency and performance index Power requirements for clearance of cuttings Minimum power requirements for lifting cuttings in a vertical hole Power consumption and efficiency in continuous-flight augers Air circulation Mud circulation Literature cited Appendix A: Vertical conveyance by continuous-fiight augers Appendix B: Surface areas on a helical flight and its stem
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  • 96
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    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
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    Call number: ZSP-201-82/1
    In: CRREL Report, 82-1
    Description / Table of Contents: On 27 March 1964 a major earthquake struck Southern Alaska. The city of Anchorage, which contained a large part of Alaska's population, suffered loss of life and destruction of property. The time of the day, the season, and ground conditions were such that loss of life and property was minimized. The frozen ground and the ice on fresh waster bodies responded to the earthquake shocks in a seldom-observable pattern, which was noted and recorded. Changes of sea level and slides into the sea were responsible for waterfront destruction. It is concluded that the main factor that limited structural damage was the frozen state of the ground.
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    Pages: iv, 26 Seiten , Illustrationen
    Series Statement: CRREL Report 82-1
    Language: English
    Note: CONTENTS Abstract Preface Abstract of events Earthquakes and frozen ground The response of freshwater ice sheets to earthquake shock The earthquake disturbance in glaciated mountains Disturbed wildlife Tidal waves Summary Literature cited
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  • 97
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    Call number: ZSP-201-82/3
    In: CRREL Report, 82-3
    Description / Table of Contents: The conditions that lead to initial breakup of a solid ice on a river due to rapid water level variations are analyzed. The analysis is based on the theory of beams on an elastic foundation. First cracking is assumed to occur when the bending moment induced in the ice cover by the wave exceeds the flexural strength of the ice cover.
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    Pages: iv, 17 Seiten , Illustrationen
    Series Statement: CRREL Report 82-3
    Language: English
    Note: CONTENTS Abstract Preface Symbols Introduction Purpose of the study Stating the problem Fracturing of the ice cover due to the passage of surge waves Basic assumptions Derivation of the bending moments Determination of the wave characteristics Deflection of the ice Discussion and field observations Summary Literature cited
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  • 98
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    Call number: ZSP-201-82/4
    In: CRREL Report, 82-4
    Description / Table of Contents: Several proposed methods for treating the momentum flux between drifting sea ice and the underlying ocean are interpreted in terms of simple planetary-boundary-layer (PBL) turbulence theory. The classical two-layer approach, in which the solution for a thin surface layer is matched to an Ekman solution for the outer layer, is used to derive several forms of the drag law. These forms range from linear (where stress is proportional to relative speed), through quadratic (where stress is proportional to relative speed squared), to a Rossby-similarity law like that used to express frictional drag on geostrophic wind in the atmosphere. Only formulations which conform with Rossby-similarity scaling are consistent with free-drift data from the 1975 AIDJEX drift station experiment.
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    Pages: iv, 17 Seiten , Illustrationen
    Series Statement: CRREL Report 82-4
    Language: English
    Note: CONTENTS Abstract Preface Background Hierarchy of drag laws and simple models The momentum equation for the planetary boundary layer Linear eddy viscosity - the constant stress layer Two-layer eddy viscosity PBL scaling A dimensionless two-layer system A dimensionless two-layer system with modified stress Evaluating the drag laws Rossby similarity parameters and buoyancy effects Discussion Literature cited
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  • 99
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    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-81/27
    In: CRREL Report, 81-27
    Description / Table of Contents: Existing classifications for deposits in the glacial environment are inadequate and inconsistent. Deposits should be classified both descriptively and genetically; adequate descriptive classifications already exist. A major problem for previous genetic classifications has been that glacial deposition and the resulting deposits' properties were poorly understood. On the basis of three criteria-sediment source, uniqueness to the glacial environment, and preservation of glacier-derived properties-deposits in the glacial environment result from either of two groups of processes: primary or secondary. Primary processes release the debris of the glacier directly and form deposits that may bear properties related to the glacier and its mechanics. Their deposits are classified genetically as till and are the only deposits indicative of glaciation. In contrast, secondary processes mobilize, rework, transport and resediment debris and deposits in the glacial environment. They develop new, nonglacial properties in their deposits, while destroying or substantially modifying glacier-derived properties. Interpretation of their properties may provide information on the depositional are classified genetically according to the depositional process just as they are in other sedimentary environments. This genetic classification differs from previous classifications in that not all diamictons deposited in the glacial environment are classified as till; it is based strictly on process-related criteria. The origin of properties of glacial deposits in relation to the glacier's mechanics and environment must be recognized if the mechanisms and depositional processes of former glaciers are to be precisely understood.
    Type of Medium: Series available for loan
    Pages: iii, 16 Seiten , Illustrationen
    Series Statement: CRREL Report 81-27
    Language: English
    Note: CONTENTS Abstract Preface Introduction Criteria for process grouping Depositional processes Deposit groups-tills and nontills Comparison of melt-out and sediment flow Melt-out Sediment flow Classification of glacial deposits Conclusions Literature cited
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    Branch Library: AWI Library
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  • 100
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-201-82/5
    In: CRREL Report, 82-5
    Description / Table of Contents: The problem of simultaneous heat and mass transfer in a homogeneous snow layer, with one side kept at its initial temperature and the other side with a step temperature increase, was solved for the case of constant through-flow conditions. An experimentally determined effective thermal conductivity function, i.e. Ke = 0.0014 + 0.58 G (where G is dry mass flow rate of air in g/sq cm-s), was employed in the solution. The computed nondimensional temperature distribution agreed quite well with experimental data taken under pseudo-steady state conditions with the exception of the temperature for the lowest flow rate used in the experiment. The pronounced nonlinearity of the temperature distribution was found to be a strong function of the flow rate. For sinusoidal variation of atmospheric pressure, the responding flow in the snow medium was also found to be sinusoidal. In conjunction with the diurnal temperature change, this variation facilitated the process of repeated sublimation and condensation in alternate directions and thereby produced a surface layer of approximately constant snow density.
    Type of Medium: Series available for loan
    Pages: v, 10 Seiten , Illustrationen
    Series Statement: CRREL Report 82-5
    Language: English
    Location: AWI Archive
    Branch Library: AWI Library
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