中文摘要：

在沉没 trapezoidal 基石上的不规则的波浪的非线性的转变上的一个一致当前的力量方向(后面或反对的波浪繁殖) 的效果的调查被执行用冲激，一个非静水力学的数字波浪模型。非线性的参数(即，不对称现象，偏斜度，和峭度) 被计算，并且为这些参数的实验公式基于测量的现在的数字数据表现为本地 Ursell 数字的一个函数。在沉没基石的变浅的区域，当波浪比波浪什么时候在相反的方向宣传在象水流的一样的方向宣传时，波浪的非线性的特征是更明显的。而非线性的参数与在冠上加强下列水流成长，当不利当前的速度在沉没基石的冠区域上增加，他们趋于减少。

英文摘要：

An investigation of the effects of a uniform current strength direction （following or opposing wave propagation） on the nonlinear transformation of irregular waves over a submerged trapezoidal sill is carried out using SWASH, a non-hydrostatic nu- merical wave model. The nonlinear parameters （i.e., asymmetry, skewness, and kurtosis） are calculated, and the empirical formulas for these parameters are presented as a function of the local Ursell number based on the present numerical data measured. In the shoaling area of the submerged sill, the nonlinear characteristics of waves are more obvious when waves propagate in the same direction as the currents than when waves propagate in the opposite direction. Whereas nonlinear parameters grow with the strengthening of the following currents over the crest, they tend to decrease as the adverse current velocity increases over the crest area of the submerged sill.