River basin management - challenge to research. Flusseinzugsgebietsmanagement - Herausforderung an die Forschung Proceedings. Tagungsband

Even in the past, the protection of individual waters and river systems, as well as the protection of groundwater resources was already the subject of intense effort. The international commissions for the protection of the Rhine and the Bodensee lake were active in the thirties and laid the foundations for the analysis of sources of pollution and for the derivation of suitable measures to improve water quality and the ecological condition of the waters. The successful approaches towards whole river catchment area management are also decades old, as the example of the Tennessee Valley Authority shows. It became clear that the problem complexes associated with 'river catchment area management' could not be tackled with water-economic approaches alone. Management measures with a tightly focused target direction (e.g fisheries, water quality, water-economic or environmental protection aspects) are often inconsistent, as the inherent contradictions cannot be seen and taken into account: agricultural practice versus environmental protection and issues of drinking water quality, fishery management practices versus water quality issues, local versus regional and global protection targets. The development and assessment of management concepts for an economically and ecologically sustainable development of complete river systems and their coastal regions requires a co-ordinated bundelling of very varied activities which are aimed at the following areas: material outflow from landscapes (biotic and abiotic material transformation processes, nutrient balances, transportation, the ground as a filtering and buffering system), material transportation and transformation in coastal ecosystems (material spread, dynamic flat-water processes, biogeochemical processes), socio-economic factors of the material flows (acceptance surveys, cost-benefit analyses, community values systems, stakeholder analyses, scenario development), combining models and development of scaling rules (multi-block approaches, scenario calculations, forecasting instruments, data management). (orig.)Published in English and GermanSIGLEAvailable from TIB Hannover: RR 6252(1999,31e): RR 6252(1999,31d) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung (BMBF), Bonn (Germany)DEGerman

Third Workshop on physical processes in natural waters Collection of written contributions

SIGLEAvailable from TIB Hannover: RR 6252(1998,23) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Biologische und chemische Entwicklung von Bergbaurestseen Statusbericht 1998/1999. Bestandsaufnahme, Methoden und Entwicklungen

Kernproblem in den Braunkohlengebieten der neuen Bundeslaender ist die Versauerung von Bergbauseen. Die Bearbeitung des Verbundprojektes konzentriert sich in den Bergbaufolgelandschaften der Regionen Mitteldeutschland und Lausitz auf bergbaulich gestoerte und in Veraenderung befindliche Oberflaechenwasser-Systeme. Arbeitziele sind 1.) die Vertiefung der Kenntnisse zur biologischen Dynamik und zum stofflichen Einfluss auf die Diversitaet und Abundanz von Plankton in sauren Bergbauseen 2) Untersuchungen zu spezifischen Wechselwirkungen (chemisch, mikrobiologisch) zwischen bergbaulich beeinflussten Sedimenten (autochthon, allochthon) und der Wasserphase 3. Betrachtungen der limnologischen und hydrochemischen Entwicklung der Wassersysteme in Bergbaufolgelandschaften hinsichtlich Umweltqualitaetszielen und/oder Nutzungszielen. Im Rahmen des Verbundprojektes werden von den Sektionen Gewaesserforschung, Hydrogeologie, Analytik, Bodenforschung und Umweltmikrobiologie in Mitteldeutschland und der Lausitz folgende Objekte bearbeitet: a) Tagebaukomplex Goitsche (Bitterfelder Revier) und b) Restloch 111 (Revier Koyne/Plessa), - Restloch 107, 117 (Revier Koyne/Plessa), - Restloch B (Revier Schlabendorf-Nord). (orig.)Acidification of mining lakes in central Germany and the Lausitz was investigated for three aspects: 1.) biological dynamics and material effects on plancton abundance and variety; 2.) Chemical and microbiological interactions between sediments influenced by mining (authochthone, allochthone) and water phase 3. 3.) Limnological and hydrochemical development of water systems in abandoned mining areas with a view to environmental quality and/or utilisation. The following objects were investigated. a) Goitsche open-cast mine (Bitterfeld district); b) Lake 111 (Koyne/Pllessa district), - Lakes 107, 117 (Koyne/Plessa district), Lake b (Schlabendorf-Nord district).SIGLEAvailable from TIB Hannover: RR 6252(2000,26) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Stoffhaushalt von Auenoekosystemen der Elbe und ihrer Nebenfluesse Naehr- und Schadstoffe - Oekotoxikologie - Belastbarkeit von Flussauen

Available from TIB Hannover: RR 6252(1999,1) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Untersuchungen zur Entwicklung und Erprobung eines Verfahrens zur In-Situ-Sulfatreduktion von geogen-schwefelsauren Bergbaurestseen des Lausitzer Braunkohlereviers. T. 1: Abschlussbericht. T. 2: Anhang: Tabellen und Abbildungen Abschlussberichte

The aim of the present project was to develop and test a method for in situ deacidification of iron-rich, sulphate-rich, strongly acid lakes left from mining in Lausitz brown coal district. Sulphate-reducing bacteria can contribute to the successive neutralisation of the water under anoxic conditions. The sulphide resulting from sulphate reduction will lead to the formation of iron and other metal sulphides, thus reducing the lakes' sulphate and iron freight. Organic substances will be added to accelerate these natural processes. The present investigations were initially carried out at the laboratory scale and the planned methods were tested for their practicability and suitability by means of extensive chemical and microbiological measurements. At the same time enclosure plants were set up in an experimental water for later field experiments after the successful conclusion of the laboratory phase. The experimental laboratory work will also be described on the basis of a geochemical modelZiel des hier dargestellten Projektes war die Entwicklung und Erprobung eines Verfahrens zur insitu Entsaeuerung eisen- und sulfatreicher, stark versauerter Bergbaurestseen des Lausitzer Braunkohlenreviers. Unter anoxischen Bedingungen koennen sulfatreduzierende Bakterien zur sukzessiven Neutralisierung des Gewaessers beitragen. Das bei der Sulfatreduktion entstehende Sulfid soll zur Bildung von Eisen- und anderen Metallsulfiden fuehren und damit die Sulfat-und Eisenbelastung der Seen vermindern. Durch Zugabe von organischen Substanzen sollen diese natuerlich ablaufenden Prozesse beschleunigt werden. Die Untersuchungen wurden zunaechst nur im Labormassstab betrieben und auf ihre Durchfuehrbarkeit und Eignung durch intensive chemische und mikrobiologische Messungen getestet. Parallel dazu wurden Enclosureanlagen in einem Experimentalgewaesser aufgebaut, in denen nach einer erfolgreichen Laborphase Feldversuche stattfinden sollten. Die experimentellen Arbeiten im Labor sollen begleitend durch ein geochemisches Modell beschrieben werden. (orig.)Published in two volumesSIGLEAvailable from TIB Hannover: F00B100+a: F00B101+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung (BMBF), Bonn (Germany)DEGerman

Geochemische und mikrobiologische Vorgaenge in Sedimenten und an der Sediment-Wasser-Grenzschicht in Restseen von Bergbaufolgelandschaften

Subjects: Applications and characterisation of sulphate-reducing bacteria in acid lakes in abandanod uranium and lignite mines; biological analysis of the lakes and their sediments; analytical methods and biogeochemical analysis of mining lakes, technical deacidification experiments, balances and models of mass flow in lakes and sediments of mining landscapesDer Workshop des Umweltforschungszentrum, Sektion Gewaesserforschung beschaeftigte sich mit folgenden Themen: Verwendung und Characterisierung von sulfatreduzierenden Bakterien in sauren Uran und Braunkohle Bergwerkswaessern, biologische Untersuchungen der Seen und deren Sedimente, analytische Methoden und biogeochemische Untersuchungen der Tagebaurestseen, technische Versuche zur Entsauerung, Bilanzen und Modelle der Stoffstroeme in den Seen und Sedimenten der BergbaufolgelandschftenAvailable from TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Die Auswirkungen der Naehrstoffe (Stickstoff und Phosphor) auf die Gewaesserbeschaffenheit der Stromelbe unter sich veraendernden Belastungsbedingungen Abschlussbericht

There is a research deficit on the effects of nutrients on the biological water quality in rivers, specially in regards to the relationship between the input of nutrients in river basins and the measured load in the rivers. Considerable differences exist in the nutrient budgets due to loss and retention of the nutrients during their transport from basin to river outlet. The objective of the project was to investigate processes which influence the eutrophication in the Elbe in order to determine new water quality targets needed to decrese the algae growth. Sampling was carried out during varios times of the year via boat cruises along the Elbe from Schmilka to Neu Darchau (532 km). The chlorophyll content increased 3 to 6 fold accompanied by a reduction in concentrations of soluble phosphorus and silicate. Up to 20% of the nitrogen was eliminated by denitrification. 10-12% of the total annual load of phosphorus was transported out of the river by dredging and high flooding events. An effective suppression of the eutrophication is not yet possible, because the SPR concentr. are still above the threshold values 1-15 #mu#g/P/1. (orig.)SIGLEAvailable from TIB Hannover: F00B473 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung (BMBF), Bonn (Germany)DEGerman

Long-term behaviour and cross-correlation analysis of water quality parameters of the Elbe river at Magdeburg, Germany

SIGLEAvailable from TIB Hannover: RR 4487(2000,8) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Entwicklung von Tagebaurestseen bei Flusswasserflutung am Beispiel des Goitschesees bei Bitterfeld Abschlussbericht

Neutralization of previously acidic mining lake Goitsche by introducing river water from Mulde river, was scientifically investigated. It became obvious that erosion and elution especially in the zone of surface wave action contributes considerably to the acidity balance. Divided by sills into several subbasins and partitioned by the density stratification into discrete water layers the neutralization progressed successively. The exchange between the basins was quantified by numerical simulation and current measurements. Already when the temporarily envisaged end water level of 71.5 m above sea was reached the entire lake was neutral, except for two small water volumes at the base of the lake bed (of pH around 6), which persisted against the mixing into the waters above due to their high concentration of dissolved substances. As a consequence of flooding and neutralizing, iron originating from acid mine drainage was precipitated. Together with the iron, phosphorus was eliminated from the water body, and hence - despite the high load of introduced nutrients -the lake never turned eutrophic, and at the end of the flooding period the lake can be classified as oligotrophic or mesotrophic. The phosphorus is bound in the sediment in various chemical compositions. Prior to flooding, or before a respective basin was impacted by the flooding waters, the plankton showed a limited variety of species, as it was typical for the conditions at that time. However, abundance could at times reach levels as high as in neutral lakes. Due to the introduced river water, the plankton composition was dominated by the introduced organisms for a limited time. For the first time in 2001, a pronounced clear water period could be established, as it was typical for neutral and stratified lakes. With the inundation with river floods in August 2002 a large amount of suspended matter was carried into the lake, which left behind a sediment layer of up to 5 m at the base of subbasin Doebern, which was the first to be hit by the inundation. In this subbasin, the thermal stratification was removed, while in the other subbasins only the epilimnia were flushed. With the inundation, a high load of nutrients was carried into the lake, which could start a plankton bloom within only few days. Within a short period of time, the introduced nutrients were deposited in the sediment. The correcponding was happening to the introduced heavy metals. Hence it appeared that the inundation could impact on the lake only for a limited time, if not transport processes out of the sediment will cause further effects. (orig.)SIGLEAvailable from TIB Hannover: F04B80 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung, Berlin (Germany)DEGerman