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  • Books  (5)
  • Maps
  • Washington, DC : United States Gov. Print. Off.  (3)
  • Hamburg : DGMK  (2)
  • Wabern : Federal Office of Topography, Swiss Geological Survey
  • 2005-2009  (5)
  • Ecology  (3)
  • Geophysical Exploration, Geophysical Prospecting  (2)
  • Lower compact magazine  (5)
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  • Books  (5)
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  • Lower compact magazine  (5)
  • 1
    Call number: S 90.0002(1758)
    In: Professional paper
    Description / Table of Contents: Comparing altered wetlands to natural wetlands in the same region improves the ability to interpret the gradual and cumulative effects of human development on freshwater wetlands. Hydrologic differences require explicit attention because they affect nearly all wetland functions and are an overriding influence on other comparisons involving wetland water quality and ecology. This study adopts several new approaches to quantify wetland hydrologic characteristics and then describes and compares the hydrology, water quality, and ecology of 10 isolated freshwater marsh and cypress wetlands in the mantled karst landscape of central Florida. Four of the wetlands are natural, and the other six have water levels indirectly lowered by ground-water withdrawals on municipally owned well fields. For several decades, the water levels in four of these altered wetlands have been raised by adding ground water in a mitigation process called augmentation. The two wetlands left unaugmented were impaired because their water levels were lowered. Multifaceted comparisons between the altered and natural wetlands are used to examine differences between marshes and cypress wetlands and to describe the effects of augmentation practices on the wetland ecosystems.
    Type of Medium: Series available for loan
    Pages: x, 152 S. , col. ill., col. maps ; 28 cm
    ISBN: 9781411323537
    Series Statement: U.S. Geological Survey professional paper 1758
    Classification:
    Ecology
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Call number: S 90.0002(1754)
    In: Professional paper
    Description / Table of Contents: Excessive nutrient [phosphorus (P) and nitrogen (N)] input from point and nonpoint sources is frequently associated with degraded water quality in streams and rivers. Point-source discharges of nutrients are fairly constant and are controlled by the U.S. Environmental Protection Agency's (USEPA) National Pollutant Discharge Elimination System. To reduce inputs from nonpoint sources, agricultural performance standards and regulations for croplands and livestock operations are being proposed by various States. In addition, the USEPA is establishing regionally based nutrient criteria that can be refined by each State to determine whether actions are needed to improve water quality. More confidence in the environmental benefits of the proposed performance standards and nutrient criteria would be possible with improved understanding of the biotic responses to a range of nutrient concentrations in different environmental settings.
    Type of Medium: Series available for loan
    Pages: XII, 81 S. , graph. Darst., Ill., Kt. , 28 cm
    ISBN: 9781411321717
    Series Statement: U.S. Geological Survey professional paper 1754
    Classification:
    Ecology
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 3
    Call number: S 97.0506(633-1)
    In: Forschungsbericht
    Type of Medium: Series available for loan
    Pages: 158 S.
    ISBN: 9783936418682
    Series Statement: Forschungsbericht / DGMK, Deutsche Wissenschaftliche Gesellschaft für Erdöl, Erdgas und Kohle e.V. 633-1
    Classification:
    Geophysical Exploration, Geophysical Prospecting
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 4
    Call number: S 97.0506(651)
    In: Forschungsbericht
    Description / Table of Contents: In einer Machbarkeitsstudie sollte die prinzipielle Anwendbarkeit flüssigkristallbildender Tenside zur Absperrung von Bohrungen geprüft werden. Für die Bearbeitung der Aufgabenstellung wurde davon ausgegangen, dass unterhalb des Steigrohrbereiches der Bohrung ein flüssigkristalliner Tensidpfropfen platziert wird, der für die Dauer der Workover-Maßnahme einen gasdichten Abschluss herstellt und nach Beendigung der Arbeiten durch ein geeignetes Lösungsmittel wieder aufgelöst und ausgefördert wird. In der Studie waren zum einen die strukturmechanischen und rheologischen Anforderungen an den Pfropfen sowie zum anderen die Anforderungen an das Phasenverhalten des Tensids zu ermitteln. Basierend auf den Ergebnissen der Untersuchungen sollten die notwendigen weiteren experimentellen Arbeiten zum Test potentiell geeigneter Tensidsysteme definiert werden.Die Untersuchungen haben gezeigt, dass derzeit kein Tensidsystem bekannt ist, das die geforderten Bedingungen erfüllt. Die für einen abdichtenden Tensidpfropfen notwendige Fließgrenze wird von den bekannten Tensidsystemen um mindestens eine Größenordnung unterschritten. Darüber hinaus erfordern die mit den einzelnen Phasen der Workover-Maßnahmen verbundenen Schritte (Einbringung der Tensidmischung in fließfähiger Form, Aushärtung zum flüssigkristallinen Pfropfen, Füllung des Bohrlochs mit Wasser und Ersetzen der Rohrtour, Auflösung und Ausförderung des Pfropfens) die Einhaltung sehr spezieller Bedingungen, die in der Praxis nicht einfach zu realisieren sein werden und außerdem sehr intensiver experimenteller Vorarbeiten bedürfen. Als einzige Möglichkeit der Anwendung flüssigkristalliner Tensidsysteme im Rahmen von Workover-Maßnahmen wird derzeit der Einsatz für die zusätzliche Abdichtung einer Kreidepackung gesehen.
    Type of Medium: Series available for loan
    Pages: 109 S. , graph. Darst.
    Edition: Als Ms. gedr.
    ISBN: 3936418616
    Series Statement: DGMK-Forschungsbericht 651
    Classification:
    Geophysical Exploration, Geophysical Prospecting
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 5
    Series available for loan
    Series available for loan
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
    Call number: S 90.0002(1722)
    In: Professional paper
    Type of Medium: Series available for loan
    Pages: XIV, 139 S.
    ISBN: 1411309758
    Series Statement: U.S. Geological Survey professional paper 1722
    Classification:
    Ecology
    Location: Lower compact magazine
    Branch Library: GFZ Library
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