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Experimental works on the hyporheic zone influence on river dynamics. I. Bed deformation

Herrera Granados O.

Studia Geotechnica et Mechanica

2010

Vol. 32, nr 3

17-26

Some experimental works are presented in order to analyze the effect of upward seepage on sediment transport mechanisms at the laboratory scale. Groundwater flow was induced by provoking hydraulic pressures in the lowest part of the bed being constituted by a fine sandy soil. The bed evolution is compared for three different flow rates (with and without seepage). Additionally, another series of experiments was carried out at a constant flow rate but at different hydraulic pressures. The results of the experiments demonstrate that the bed deformation with seepage is smoother than without seepage, especially in the zones where secondary flows arise due to scouring at the entrance to the experimental flume.