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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 1 (1977), S. 425-431 
    ISSN: 1432-1009
    Keywords: Recreatbnal impact ; Forests ; Tree growth ; Human traffic impact ; Soil compaction ; Washington County R.I.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Impact of recreational activities on soil and vegetation was evaluated in eight forested camping and picnic areas in southern Rhode Island. Forest vegetation consists of mixed-oak and white pine stands. Soils are of granitic glacial till or outwash origin and textures range from loamy sand to find sandy loam. Recreational use resulted in significant compaction of soils as indexed by soil penetration resistance and bulk density. Evidence indicates that compaction influences bulk densities to a depth of about 12.7 cm. Rates of water infiltration are less on recreation areas. Soil water accretion and depletion during the growing season are less rapid on recreation sites than on control sites. Differences are attributed to reduced infiltration, percolation, and rooting activity. Much of the ground surface on recreation areas is devoid of vegetation. The surface consists primarily of bare mineral soil, rock, or litter. The plants most commonly present are grasses. Native ground cover vegetation including tree seedlings, ericaceous shrubs and herbs has been eliminated or greatly reduced by trampling. Damage to tree trunks is common in recreation areas. White pine radial growth and scarlet oak height growth were significantly less on recreation sites. Scarlet oak appears intolerant to heavy recreation use.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-06-27
    Description: Dynamic characteristics of aircraft with wings free to pivot spanwise axis
    Keywords: AIRCRAFT
    Type: NASA-CR-1523
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-13
    Description: Free wing aircraft dynamic characteristics, discussing gust alleviation and handling qualities
    Keywords: AIRCRAFT
    Type: AIAA PAPER 70-947 , AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, GUIDANCE, CONTROL AND FLIGHT MECHANICS CONFERENCE; Aug 17, 1970 - Aug 19, 1970; SANTA BARBARA, CA
    Format: text
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