A nonlinear numerical model for wave transformation is established in time domain based on integral equation transformed from two dimensional laplace equation . then the model is applied to compute the linear wave and nonlinear wave deformation in offshore flow field . a new 0 - 1 combined bem ( boundary element method ) is adopted in this thesis to avoid computational errors accumulated with time steps 本文以波动势函数的laplace方程的green积分转换得到的边界积分方程为基本控制方程，建立了一种新的时域内波浪变形计算的数值模型，籍此对非线性波浪在结构物周围的波浪形态进行了数值模拟，并通过数值造波水槽内的波浪试验对数值模拟结果进行检验。
