Geomorphic and ecological monitoring of an experimental sediment reintroduction into the Rhine River downstream of the Kembs dam Bilan éco-morphologique de la recharge sédimentaire expérimentale sur le Vieux Rhin
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22 juin 2015
- handle: 10670/1.xsnhuo
- hal: hal-01263882
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Biomonitoring (Ecology) Ecological monitoring Monitoring, Environmental Environmental quality--Measurement Environmental quality--MonitoringCiter ce document
Fanny Arnaud et al., « Bilan éco-morphologique de la recharge sédimentaire expérimentale sur le Vieux Rhin », HAL-SHS : géographie, ID : 10670/1.xsnhuo
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Résumé
An experimental gravel reintroduction was conducted into the Rhine River to assess the feasibility of restoring the sedimentary dynamics and improving the morpho-ecological processes over the medium and long terms. 23.000 m3 of sediments were supplied in 2010 in a 50 km long, by-passed river reach between the Kembs and Breisach dams. A deposit of 620 m long, 12 m wide and disconnected from the bank was created. Geomorphic monitoring was implemented, coupling bathymetric and topographic surveys, multi-date aerial imagery, bedload tracing and grain size sampling. Five states have been surveyed since 2009 (initial, post-injection and post-floods). This permitted to understand sediment transfer processes, assess the potential risks for society and test physical evaluation indicators. Ecological monitoring was also conducted: cross-section vegetation transects were placed between Kembs and Vogelgrün and changes have been monitored since 2010. An analysis of invertebrate compartment was performed in 2013, on transects immediately upstream the injection site, in intermediate positions and close downstream the injection site. This paper restitutes the morpho-ecological responses after 5-year monitoring. It provides feedback for guiding future restoration strategies to diversify aquatic and riparian habitats of the Old Rhine.