Three 1D models and one 2D simulation were compared to experimental measurements. Severe mass and momentum transfers from the floodplain towards the main channel were observed, giving rise to a noteworthy transverse slope of the water surface and different head loss gradients in the two subsections. Experiments on a contraction model were carried out in an asymmetric compound channel flume. The present study focuses on an abrupt floodplain contraction (mean angle 22°) in order to determine whether one-dimensional (1D) models, developed for straight and slightly converging geometry, are equally valid for such a geometry. Flooding rivers usually present transition reaches where the floodplain width can significantly vary.
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