Author(s): A. Kadota; E. Kojima; H. Muraoka; K. Suzuki

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Abstract: There are several types of groyne such as T-type and L-type groynes. These groynes have been empirically constructed worldwide according to several environments in rivers. Because the sand transported from the groynes largely affects on the formation of sand wave far downstream area, the morphological phenomena should be considered systematically and in detail. In this study, the characteristics on changes of bed configuration due to T and L-type groynes are experimentally revealed comparing with the experimental results of I-type groynes. Experiments were conducted in a straight flume with a sand box to make a movable bed. To cover a large measurement area at the downstream of groyne, a longrange laser displacement sensor was used to measure the bed configuration. The bed configurations are immediately and accurately measured by the measuring system. Experimental results show that the maximum scour depth changes greatly with the groyne types. The difference of bed form downstream of the groyne is seen in development and length of sand waves.

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Year: 2009