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在探讨由于水体的运动而引起泥沙输送时,第一个问题便是泥沙在什么条件下开始运动。本文讨论的波浪作用下的泥沙起动,便是属于上述问题中的一个题目。 对于单向定常流的情况来说,表达泥沙起动状态的一种广泛使用的方法,是采用Shields(1936)曲线,Madsen和Grant(1976)曾把它推广到波浪作用下的泥沙起动中去,本文着重讨论了Madsen和Grant(1976)的方法,指出了它的不足之处,并作了相应的改进。大量的实验资料验证表明,本文建议的方法和实验资料的一致性,要比Madsen和Grant(1976)的方法好得多。
In discussing sediment transport due to the movement of water bodies, the first question is under what conditions does the sediment begin to move. The sediment start-up under the action of waves discussed in this article belongs to one of the above problems. One widely used method for expressing the state of sediment onset for unidirectional steady flow is to use the Shields (1936) curve, which Madsen and Grant (1976) extended to launching sediment under wave action Going, this article focuses on the methods of Madsen and Grant (1976), points out its shortcomings, and makes corresponding improvements. A large number of experimental data verify that the proposed method and experimental data consistency is much better than that of Madsen and Grant (1976).