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本文对来水平均流速大于泥沙起动流速阶段,在无粘性泥沙中,圆形桥墩的局部冲刷深度与来水平均流速的关系,进行了研究。搜集并整理了各种不同的桥墩直径、泥沙粒径及来水平均流速的试验数据。从大量数据得知;冲刷深度与流速之间的关系,因河床沙波形成或沙波未形成而有所不同,每种情况都建立了函数关系.这两种函数有两个最大冲刷深度。它们分别出现于来水平均流速等于起动流速及过渡平床流速时。与以前各家著述不同的是:在河床沙波形成阶段,最大冲刷深度出现于过渡平床状态。而对沙波未形成阶段,最大冲刷深度出现于泥沙起动流速状态。
In this paper, the relationship between the average velocity of incoming water and the average velocity of incoming water in non-viscous silt is studied. Collecting and arranging a variety of experimental data of pier diameter, sediment size and average velocity of incoming water. It is known from a large amount of data that the relationship between scour depth and flow rate is established in each case as a function of the formation of the sand bed in the river bed or the absence of sandwaves, and the two functions have two maximum scour depths. They appear in the incoming water flow velocity equal to the initial flow rate and the transitional bed velocity. Different from previous works, the maximum scour depth appears in the transitional flatbed state during the formation of the sand bed. However, when the sand wave is not formed, the maximum scour depth appears in the state of sediment flow velocity.