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. Rohrschollen Island is an artificial island of the large Upper Rhine riverwhose geometry and hydrological dynamics are the result of engineering worksduring the 19th and 20th centuries. Before its channelization, the Rhineriver was characterized by an intense hydromorphological activity whichmaintained a high level of biodiversity along the fluvial corridor. Thisfunctionality considerably decreased during the two last centuries.In 2012, a restoration project was launched to reactivate typical alluvialprocesses, including bedload transport, lateral channel dynamics, andsurface–subsurface water exchanges. An integrated hydrological model has beenapplied to the area of Rohrschollen Island to assess the efficiency of therestoration regarding surface and subsurface flows. This model is calibratedusing measured piezometric heads. Simulated patterns of water exchangesbetween the surface and subsurface compartments of the island are checkedagainst the information derived from thermal infrared (TIR) imaging. The simulatedresults are then used to better understand the evolutions of theinfiltration–exfiltration zones over time and space and to determine thephysical controls of surface–subsurface interactions on the hydrographicnetwork of Rohrschollen Island. The use of integrated hydrological modelinghas proven to be an efficient approach to assess the efficiency ofrestoration actions regarding surface and subsurface flows.

hydrology and earth system sciences

Assessing the effect of flood restoration on surface–subsurface interactions in Rohrschollen Island (Upper Rhine river – France) using integrated hydrological modeling and thermal infrared imaging