Étude des impacts hydrauliques, sédimentologiques et écologiques liés aux travaux hydrauliques sur la Semois

• Published in: BELGEO (Leuven) Vol. 3; no. 3; pp. 243 - 256
• Main Authors: Gob, F., Houbrechts, G., Mols, J., Petit, F., Guyon, F., Rosillon, F., Cogels, X., Vander Borght, P., Ancion, J.P., Ntibarufata, E., Hiver, J.M., Philippart, J.C.
• Format: Journal Article
• Language: English
• Published: Société Royale Belge de Géographie and the Belgian National Committee of Geography 30.09.2003
• Subjects: barbel; bedload; dredging; hydraulics; ichtyofauna; sedimentology
• DOI: 10.4000/belgeo.16584
• ISSN: 1377-2368

This study aims to evaluate impacts of riverbed dredgings in the Semois catchment (Ardenne). This is an interdisciplinary study focused on the hydraulic, environmental, geomorphological and sedimentological aspects. The geomorphological and sedimentological study compare old maps and old photograph to highlight the general evolution of the river. Also, the bedload discharge has been calculated. A hydraulic model, (Bertrand, 1994) has been applied to evaluate the effect of dredging on the water level. The software EVHA has been used to evaluate the losses of fish’s habitat in the dredged sites. The dredging have low effect terms of flood protection and the time needed to recover the pre-works situation, and such works has reduced the environmental index in the dredged sites.