基于SWAN模型的风生波河道防浪林消浪模拟

Wave attenuation simulation of vegetation based on the SWAN model in rivers

选取嫩江干流佰大街堤防为研究区,综合分析其河道地形与岸线条件,应用地表水模拟系统(surface water modeling system, SMS)差分生成局部加密的非结构三角形计算网格。在此基础上,基于第三代浅水波浪模型(simulating wave nearshore, SWAN)模拟防浪林对河道风生波的影响。结果表明:在发生50年一遇洪水时,模型模拟波高与实测波高的相关系数达到0.95,模拟结果较好;嫩江干流佰大街堤防现状防浪林的消浪效果显著,消浪系数达到30.51%;基于非结构三角网格的SWAN模型能较好地模拟以风生波为主的复杂地形河道内的波浪场。

Taking the Baidajie embankment in the mainstream of Nenjiang River as the typical area,the locally encrypted and unstructured triangular calculating grid was generated by the surface water modeling system (SMS) based on the complex river topography and coastline conditions.Then,the third generation of shallow water wave model (simulating wave nearshore,SWAN) was adopted to simulate the effect of wave attenuation forest on the wind-generated waves in river.The results show that the correlation coefficient between the simulated wave height and the measured wave height is 0.95.The coefficient of wave dissipation is 30.51% under the condition of a flood once in fifty years.It means that the simulating results are reasonable and the anti-wave effect is significant.Meanwhile,the SWAN model based on the unstructured triangular mesh can effectively simulate the wind-generated wave field in the river of complex topography.