Does restoration of flooding and reconnection of anastomosing channels in the upper Rhine floodplain improve alluvial ecosystem functions and biodiversity?

Autor: Trémolières, Michèle, Schmitt, Laurent, Defraeye, Stéphane, Coli, Cécile, Denny, Evelyne, Dillinger, M., Dor, J.C.
Přispěvatelé: Schlumberger, Rosine, Laboratoire d'Hydrologie et de Géochimie de Strasbourg (LHyGeS), École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Ecole et Observatoire des Sciences de la Terre (EOST), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre d'Ecologie Végétale et d'Hydrologie (CEVH), École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES), Université Lumière - Lyon 2 (UL2), ONF-SAT, OFFICE NATIONAL DES FORETS, Denny Consultant, Ginger Environnement, consultant, Ecoscope, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2008
Předmět:
Zdroj: Proceedings
4th ECRR Conference on River Restoration
4th ECRR Conference on River Restoration, Jun 2008, Venise, Italy. pp.825-836
Popis: beaucoup d'auteurs... P. Gombert, A. Gueidan, M. Lebeau, S. Manné, J.P. Party, P. Perrotey, M. Piquette, U. Roeck, A. Schnitzler, O. Sonnet, J.P. Vacher, V. Vauclin, M. Weiss, J.N. Zacher, P. Wilms; Hydraulic works on large rivers have drastically modified the structure and the functioning of alluvial ecosystems. In particular they have led to disconnection of anastomosing and/or braiding channels, and alluvial forests from the main channel. Nowadays many projects of restauration are developed aiming at both flood retention and ecological restauration. One of the objectives is to restore river functional characteristics of the alluvial ecosystems such as surface water/groundwater exchanges, lateral hydrological connectivity, water purification, diversity of habitats and species. Within the Upper Rhine floodplain (eastern France), the "Erstein polder" is a pilot site which allows the monitoring of the impact of alluvial areas re-flooding. The re-flooding of the polder by flood waters, which are usually highly charged with suspended and soluble matter, may change the physical and chemical compposition of different compartments -water, sediment and soil- of the alluvial system. Additionally, the hydrodynamics of the anastomosing channels is enhanced by the re-flooding and the reconnection with the main channel. The objectives of the monitoring are : i) to identify the risks of water pollution, related to transfer of floodwaters into the groundwater. This requires the monitoring of pollutants brought by the Rhine; ii) to define the impact of floods on habitats, flora and fauna through relevant biological indicators; iii) to analyze the ability of the alluvial system to recover its specific functions. Since 2003 (reference year) two types of studies were conducted, one focusing on the hydrological, hydraulic, hydrochemical and geomorphological factors, the second addressing the impacts of these factors on biological compartments (terrestrial and aquatic plants, fishes, amphibians and invertebrates). Four short flood events occurred during the investigation period (2004-2007). We present the main results of the observed changes as a consequence of re-flooding and channel reconnection obtained after four years of monitoring.
Databáze: OpenAIRE
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