MEASUREMENTS OF BED TOPOGRAPHY, WATER SURFACE PROFILE AND VELOCITY FIELD UNDER THE PRESENCE OF TRIANGLE-SHAPE WATER SURFACE WAVE

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  • 三角波形成時の河床・水面形状と内部流況の計測

Abstract

<p> In channels with supercritical flow conditions, a large triangle-shape water surface wave forms because the water surface over antidunes is in phase with the bed. The presence of the triangle-shape water surface wave causes the deviation of local flow velocity from the average velocity field, and often results in destabilizing revetment blocks. In this study, we measured the bed topography of the 3D antidune, the surface profile of the triangle-shape wave and the spatial distribution of the flow velocity for the purpose of collecting basic data of block design. The experimental results show that 3D antidune has a crescent moon shape drawing an arc down-stream. The crossing streams caused by the 3D antidune rise the water surface elevation near the crest of the antidunes and generate the traianlge-shape wave. In addition, the local flow velocity increases 20 percent from the average flow velocity.</p>

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