In search for the ecological and toxicological relevance of sediment re-mobilisation and transport during flood events |
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Authors: | Jan Wölz Catrina Cofalla Sebastian Hudjetz Sebastian Roger Markus Brinkmann Burkhard Schmidt Andreas Schäffer Ulrike Kammann Gottfried Lennartz Markus Hecker Holger Schüttrumpf Henner Hollert |
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Institution: | 1. Department of Ecosystem Analysis, Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074, Aachen, Germany 2. Institute of Hydraulic Engineering and Water Resources Management, RWTH Aachen University, Hydraulic Laboratory, Kreuzherrenstr. 7, 52056, Aachen, Germany 3. Environmental Biology and Chemodynamics, Institute for Environmental Research, RWTH Aachen University, Worringerweg 1, 52074, Aachen, Germany 4. Johann Heinrich von Thuenen-Institute (vTI), Federal Research Institute for Rural Areas, Forests and Fisheries, Institute for Fishery Ecology, Palmaille 9, 22767, Hamburg, Germany 7. Forschungsinstitut für, ?kosystemanalyse und -bewertung e. V. (gaiac), Worringerweg 1, 52056, Aachen, Germany 5. ENTRIX, Inc., Saskatoon, SK, Canada 6. Toxicology Centre, University of Saskatchewan, Saskatoon, SK, Canada
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Abstract: | In response to increasing concerns about the potential toxicological impacts of (extreme) flood events, scientists from several
disciplines have joined to form the interdisciplinary research project named FLOODSEARCH. FLOODSEARCH is one of the recent
Pathfinder Projects supported by the German Excellence Initiative via the Exploratory Research Space at RWTH Aachen (ERS).
FLOODSEARCH aims to combine methodologies of hydraulic engineering and ecotoxicology in a new interdisciplinary approach to
assess the risks associated with the re-mobilisation of particulate bound contaminants often observed after severe flood events.
Impacts of extreme flood events and aspects of re-mobilisation of sediment-bound toxic compounds will be characterised and
evaluated in controlled experiments fusing flood simulation technologies with biological effects assessment. The overall goal
is to establish a novel and more realistic approach towards flood event testing that can be applied to a number of different
questions and species. Specifically, model aquatic species such as rainbow trout (Onchorhynchus mykiss) will be exposed to particle-bound contaminants in flood-like conditions in a specifically designed annular flume that permits
monitoring of both physical/chemical and biological parameter. Ultimately, this approach will assist to further our understanding
of the potential biological risks associated with increasingly frequent extreme flood events, e.g., as a consequence of climate
change, by bridging the gap between the physical (re-)mobilisation of contaminants and resulting toxicological impacts on
aquatic organisms. Thus, it is the objective of the project to derive relationships between the hydrodynamic parameters such
as velocities and turbulences, the parameters associated to sediment transport such as sediment concentration and grain sizes
and the biological parameters. |
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Keywords: | Sediment mobilisation Sediment erosion Flood event Annular flume Fish exposure Biomarker Sediment toxicity |
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