泥沙突变理论在海底管线冲刷中应用

基于泥沙突变理论,针对海底管线冲刷下泥沙的运动特征,建立恒定流作用下的泥沙起动模式,确定希尔兹数、无量纲参数、冲刷坑深度之间相互作用的非线性方程,推导了恒定流作用下海底管线冲刷坑深度的预测公式。将相同条件下该公式的计算结果与前人的试验资料进行了对比,可发现尽管计算结果存在一定的误差,但也基本能满足对冲刷坑深度的预测和判断,从而证明了泥沙突变模型在预测海底管线冲刷坑深度中的适用性。

Application of cusp catastrophe theory in submarine pipeline scour depth

Based on the characteristics of sediment movement with the submarine pipeline scour state,a nonlinear relation formula between the Shields number,the non-dimensional number d*=md m/d 0 and scour depth under steady flow was proposed by using the cusp catastrophe theory,and a formula for predicting the scour depth of submarine pipeline under the steady flow conditions was derived.Comparing the calculated results of the formula with the experimental data,although there are some errors,it can be found that this formula can basically meet the requirement used for prediction and judgment of scour depth,which proves the applicability of cusp catastrophe theory in predicting the scour depth of submarine pipeline.