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  • German  (2,611)
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  • 1
    Series available for loan
    Series available for loan
    Freiburg i. Br. : Inst. für Hydrologie der Univ.
    Associated volumes
    Call number: ZS-065(26)
    In: Freiburger Schriften zur Hydrologie
    Description / Table of Contents: Knowledge about soil water transport and groundwater renewal rates is crucial for groundwater research and risk assessment. Particularly the impact of preferential flow paths in the unsaturated zone on pollutant transport is an important topic, as it affects the vulnerability of the adjacent aquifer. However, in literature the determination of preferential flow is only partly solved and especially quantification attempts have been rare. Therefore, a new method combining mathematical modelling with hydrological and environmental isotope data was developed to estimate the heterogeneity of the unsaturated transport processes. For this purpose, environmental isotope transport (18O, 2H) was investigated in several lysimeter experiments. A conceptual model was applied, which separates preferential and matrix flow. Both flow components are quantified and their transit time distribution functions are determined to construct specific vulnerability diagrams.Water flow and transport of environmental isotopes through the soil matrix was calculated using both a transient modelling approach solving numerically Richards and Convection-Dispersion-Equation for single porous medium and a lumped parameter approach using the Dispersion Model. The preferential flow component is assumed by piston flow occurring within one week and having no interaction with the soil matrix.For quantification a two component flow approach was applied to the isotope and hydrological data. The mean transit time distribution functions were obtained from the lumped parameter approach and visualized in specific vulnerability diagrams, showing when infiltrating water reaches the groundwater. This method was applied to different lysimeter experiments that were conducted under natural atmospheric conditions. Different lysimeters, filled mostly with sandy soil material, were under investigation to study the impact of soil properties and vegetation on the transport heterogeneity and amount of preferential flow.It was shown that the lumped parameter approach yielded good results modelling the isotope transport in the soils with bare surface. An application to the soils with vegetation required a modification of the classical input function including evapotranspiration and thus considering the infiltration events contributing to the discharge. Additional separation into the single vegetation periods improved the modelling.Preferential flow was observed in all soils and quantified with the two component flow approach. In bare sandy and gravel soils the mean fractions of preferential flow varied between 17 and 30 %. Here, the crucial parameter influencing these fractions was found to be the saturated hydraulic conductivity. In the cropped soils the mean fractions of preferential were dependent on the discharge rate and varied according to the vegetation. Mean fractions of 3 % and 18 % were observed in a loamy sand during intercrop period and cultivation of maize monoculture, respectively. The same soil material but cultivated with crop rotation yielded mean fractions of 14 % during maize, 4 % during winter barley and 15 % during the intercrop vegetation period. In a third experimental setup with sandy soil a mean fraction of 8 % was found.Specific vulnerability diagrams were constructed showing the mean transit time distribution functions of both, preferential and matrix flow. Their patterns were closely related to soil parameters. They can be used as a helpful tool to develop groundwater protection strategies more efficiently.It was shown that the presented method enabled the estimation of transport heterogeneity and the quantification of preferential flow under natural atmospheric conditions in bare and cropped lysimeters using environmental isotope data. Such isotopes are adequate tracer to study the transport processes in the unsaturated zone. It was revealed that experiments with continuous natural application like environmental tracers over long time periods were necessary to cover a broad range of flux variability and to determine transport heterogeneity.
    Type of Medium: Series available for loan
    Pages: VI, 111 S.
    Series Statement: Freiburger Schriften zur Hydrologie 26
    Classification:
    Hydrology
    Language: German
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    München : Dt. Verl.-Anst.
    Call number: PIK D 024-09-0049
    Type of Medium: Monograph available for loan
    Pages: 270 S.
    Edition: 2. Aufl.
    ISBN: 9783421043535
    Uniform Title: Cool it: the skeptical environmentalist's guide to global warming
    Language: German
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    Heidelberg : dpunkt. Verl.
    Call number: 18/M 09.0109 ; M 12.0062
    Type of Medium: Monograph available for loan
    Pages: XIV, 394 S. : Ill., graph. Darst.
    ISBN: 9783898644761
    Uniform Title: SOA in practice
    Classification:
    Informatics
    Language: German
    Location: Reading room
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 4
    Monograph available for loan
    Monograph available for loan
    Potsdam : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Call number: AWI Bio-09-0032
    Type of Medium: Monograph available for loan
    Language: German
    Branch Library: AWI Library
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  • 5
    Monograph available for loan
    Monograph available for loan
    Frankfurt am Main : Suhrkamp
    Call number: M 09.0380
    Type of Medium: Monograph available for loan
    Pages: 159 S.
    Edition: Orig.-Ausg., 1. Aufl.
    ISBN: 3518260022 , 978-3-518-26002-9
    Series Statement: Edition Unseld 2
    Uniform Title: The crime of reason
    Language: German
    Note: Erscheinungsjahr in Vorlageform:2008
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 6
    Call number: 2/M 09.0277
    In: Schriften des Forschungszentrums Jülich
    Description / Table of Contents: Die Anzahl wissenschaftlicher Publikationen in Zeitschriften, die Anzahl von Zitationen in diesen Zeitschriftenartikeln und die Anzahl angemeldeter Patente steigen kontinuierlich und scheinbar unaufhaltsam. Der Einsatz von Bibliometrie eröffnet die Möglichkeit, diese Kommunikation in der Wissenschaft transparenter zu machen: So können mit Hilfe von Bibliometrie die Entwicklung von Themen nachvollzogen, die Wahrnehmung von Einrichtungen bestimmt und mögliche Kooperationspartner identifiziert werden. Die Dissertation illustriert, wie es mit Hilfe von quantitativen bibliometrischen Methoden möglich ist, einen objektiven Eindruck wissenschaftlicher Entwicklung zu gewinnen. Sie befasst sich dabei mit der Frage, wie Bibliometrie im Kontext von Trendbeobachtung und Trenderkennung in der Naturwissenschaft eingesetzt werden kann und welcher Nutzen sich hieraus ergibt. | The number of scientific publications in journals, the number of citations in these journal articles and the number of patent applications are all rising steadily in what appears to be an unstoppable manner. The use of bibliometrics is one way of making this communication within science more transparent. Bibliometrics can be used as an aid to understand the development of topics, to determine the perception of institutions, and to identify possible cooperation partners. This dissertation will explain how quantitative bibliometric methods can be used to gain an objective impression of scientific development. It looks at how bibliometrics can be used for trend observation and trend recognition in the natural sciences and the benefits that arise as a result.
    Type of Medium: Monograph available for loan
    Pages: 311 Seiten , Illustrationen, Diagramme
    ISBN: 9783893365500
    Series Statement: Schriften des Forschungszentrums Jülich 19
    Language: German
    Note: Zugl.: Regensburg, Univ., Diss., 2007
    Location: Reading room
    Branch Library: GFZ Library
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  • 7
    Series available for loan
    Series available for loan
    Frankfurt am Main : Verl. des Bundesamtes für Kartographie und Geodäsie
    Associated volumes
    Call number: S 99.0435(43)
    In: Mitteilungen des Bundesamtes für Kartographie und Geodäsie
    Type of Medium: Series available for loan
    Pages: 126 S.
    ISBN: 9783898889551
    Series Statement: Mitteilungen des Bundesamtes für Kartographie und Geodäsie 43
    Classification:
    Cartography, Geographical Information Systems, GIS
    Language: German
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 8
    Call number: AWI Bio-09-0033
    Type of Medium: Monograph available for loan
    Pages: 97 S. : Ill., graph. Darst.
    Language: German
    Branch Library: AWI Library
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  • 9
    Monograph available for loan
    Monograph available for loan
    Bonn : Galileo Press
    Call number: M 09.0067
    Type of Medium: Monograph available for loan
    Pages: 437 S. , Ill., graph. Darst.
    ISBN: 9783836211673 , 3-8362-1167-X
    Series Statement: SAP PRESS
    Uniform Title: Discover SAP
    Classification:
    Informatics
    Language: German
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 10
    Call number: 4/M 08.0441
    Type of Medium: Monograph available for loan
    Pages: 320 S.
    ISBN: 9783888975264
    Uniform Title: Supercontinent. Ten Billion Years in the Life of Our Planet
    Classification:
    Geosciences
    Language: German
    Location: Reading room
    Branch Library: GFZ Library
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