15 Fakultätsübergreifend / Sonstige Einrichtung

Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/16

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Institute: search.filters.UBSInstitut.Institut für Wasser- und UmweltsystemmodellierungPublication Type: search.filters.UBSTyp.Zeitschriftenartikel

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    Contamination des eaux souterraines par les nitrates : recherches et applications dans le cadre de la coopération franco-allemande
    (1990) Laigle, Dominique; Kugler, Jean; Kobus, Helmut; Zilliox, Lothaire
    Cet article est une synthèse du colloque organisé à Stuttgart en octobre 1988 autour du thème: "Contamination des eaux souterraines par les nitrates". Ce congrès, inscrit dans le cadre de la coopération franco-allemande, s'est tenu le 6 octobre dans les locaux de l'Université de Stuttgart. Il faisait suite à l'atelier/workshop franco-allemand organisé les 25 et 26 septembre 1986 à Colmar sur le thème: "Pollution des eaux souterraines par les nitrates- sites expérimentaux, métrologie, modélisation". Il a été suivi le 7 octobre 1988 par une réunion restreinte dont le but était d'étendre le débat à la contamination des eaux souterraines par les produits phytosanitaires et à la problématique du stockage et de l'épandage rationnel de lisiers et de boues de stations d'épuration. Dans les discussions ont été intégrés divers thèmes tels que celui des périmètres de protection des captages d'eau potable et ceux relatifs aux programmes futurs de coopération.
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    Strömungsmechanische Probleme bei der Kühlwasserführung in Kernkraftwerken
    (1979) Kobus, Helmut; Naudascher, Eduard; Richter, Andreas; Westrich, Bernhard
    Die hydraulischen Probleme beim Entwurf der Bauwerke im druckfreien Teil des Kühlwasserkreislaufs (Entnahme- und Verteilerbauwerk, Kraftschlußbecken, Kühltasse) werden beschrieben. Es werden die Anforderungen an die hydraulische Leistungsfähigkeit des Kühlsystems zur Realisierung von Frischwasser-, Ablauf-, Kreislauf- und Mischkühlung skizziert, sowie versuchstechnische und numerische Lösungsmöglichkeiten an Hand ausgeführter repräsentativer Untersuchungen an bestehenden und geplanten Kraftwerken aufgezeigt.
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    Vertical migration of phytoplankton in coastal waters with different UVR transparency
    (2011) Gerbersdorf, Sabine Ulrike; Schubert, Hendrik
    Background: The vertical migration of phytoplankton was investigated in natural waters using in situ fluorescence profiling, chlorophyll a concentrations and life counts at two study sites differing in coloured dissolved organic matter (cDOM) concentrations. The data from the corresponding water depths (50-cm intervals down to 10 m) and times (hourly, before dawn to sunset, several days) were related to the highly resolved (2 nm) underwater ultraviolet radiation (UVR)/photosynthetic active radiation (PAR) transparency (290 to 700 nm). Results: Chlorophyll a maxima of mainly motile dinoflagellates were observed in situ at all days and at both study sites (open marine, brackish waters), independent on prevailing weather conditions or cDOM concentrations. Phytoplankton migration was triggered solely by irradiance in the 400- to 700-nm wavelength range (PAR) at the particular water depth, irrespective of PAR/UVR ratios and surface UVR (290 to 400 nm), after an illumination period of about 40 min. Interestingly, the PAR tolerance levels of the phytoplankton, which have been lower in cDOM-rich waters, matched their light acclimation values determined by parallel PAM measurements. Conclusions: The response of the phytoplankton to PAR is not a sufficient protection strategy versus increasing UVR levels, which might have wide ecological implications beyond the level of primary producers to impact important ecosystem functions such as the delicate trophic interactions.
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    Education of hydraulic engineers
    (1994) Kobus, Helmut; Plate, Erich; Shen, Hsieh Wen; Szöllösi-Nagy, Andras
    In this report, a joint IAHR and UNESCO panel adresses the current developments in hydraulic engineering and their implications for the education of hydraulic engineers. The framework of underlying basic sciences, geoscienses and engineering sciences and the large variety of engineering subjects involved must be seen in the broader context of the natural and social environment. In addition to its classical tasks, hydraulic engineering has evolved to deal with water quality, environmental issues and ecology, and its further broadened by the new challenges posed by the need for sustainable development and by the threat of global changes. New developments in science and technology and computer sciences must be reflected both in contents and methods of teaching. Education must also provide engineering skills and procedures as well as professional preparation including the ability to work in terdisciplinary teams. In view of these developments, continuing education will have major role to play, and large-scale systems and international aspects will be of increasing importance. These developments call for suitable IAHR activities.
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    Pollution par les nitrates: quels remèdes?
    (1990) Zilliox, Lothaire; Schenck, Charles; Kobus, Helmut; Huwe, Bernd
    Au cours des dix dernières années, la pollution des eaux souterraines par les nitrates n'a cessé d'augmenter. Principale accussée: l'agriculture, l'application de méthodes de techniques culturales devrait permettre une meilleure gestion des engrais azotés.