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Communication Dans Un Congrès Année : 2010

Flows and bedload dynamics around spur dyke in a compound channel

B. Camenen

Résumé

Spur dykes are typical man-made hydraulic structures and widely used in alluvial rivers for a variety of purposes like the bank protection, the maintenance of navigation channel and so on. Spur dykes give some impacts on the flow and bedload dynamics around itself and cause the variation of flow patter and bottom profile according to the relationship between the flow characteristics and bed configurations. In the case of a compound channel with a spur dyke on the floodplain, the effect of the spur dyke on the flow and bed configuration makes the flow characteristics complicated. In order to investigate the flow characteristics around the spur dyke, some experimental studies have been carried out using the LSPIV technique and an electromagnetic velocimeter. The velocity distributions around spur dykes are discussed in combination with the type of the spur dykes and the relative depth Hr (the ratio of the water depth in the floodplain and main channel). The longitudinal length of the recirculation area is discussed as well. The difference of the flow pattern around the foot of the spur dyke between impermeable and permeable cases also illustrated based on the experimental results, and it is founed that the permeable spur dyke appears to be a much more interesting alternative to the impermeable spur dyke in term of morphodynamics around the spur dyke.
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Dates et versions

hal-00545965 , version 1 (13-12-2010)

Identifiants

Citer

Y. Baba, B. Camenen, P. Peltier, F. Thollet, H. Zhang. Flows and bedload dynamics around spur dyke in a compound channel. 11th International Symposium on River Sedimentation (ISRS), Sep 2010, Stellenbosch, South Africa. 11 p. ⟨hal-00545965⟩

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