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本文提出一种可以模拟潮流运动的自动化控制水槽。该水槽可以实时控制往复流两端的水位,实现水流的往复运动,并可以按计算机要求实现水位的稳定或渐变。本文同时利用该水槽进行了圆柱形桥墩周围的床面冲刷试验,试验在低流速固定水位、高流速固定水位及往复流三种水流条件下进行,并以试验所获得的测试数据、照片为基础,分析了不同水流条件下圆柱形桥墩周围的床面冲刷情况。试验发现在桥墩附近,水流的旋滚运动及旋涡系是造成床面冲刷的主要原因,另外对于往复流情况,桥墩附近床面受到的冲刷比固定水位冲刷时要严重,也更为复杂。
This paper presents an automatic control tank that simulates tidal currents. The water tank can control the water level at both ends of the reciprocating flow in real time to realize the reciprocating motion of the water flow, and can realize the stability or gradual change of the water level according to the requirement of the computer. In the meantime, the bed was used to test the bed surface erosion around the cylindrical pier. The test was carried out under the conditions of fixed water level at low flow rate, fixed water level at high flow rate and reciprocating flow. Based on the test data and photos , Analyzed the situation of bed erosion around the cylindrical pier under different water flow conditions. It is found that the rolling motion of the water stream and the vortex system are the main causes of the bed erosion near the piers. In addition, for the reciprocating flow, the erosion of the bed near the pier is more serious and complicated than that of the fixed water level scouring.