天津南港浪、流特征及流对浪的影响研究

Study on wave and current characteristics and the influence of current on wave in the South Port of Tianjin

以WRF模式提供的大气数据为输入,采用SWAN海浪模式,FVCOM流模式对渤海区域的1997至2016年的波浪场、流场进行了数值计算。利用数值计算结果,首先对波浪进行了20年里几次典型大风过程的结果分析与对比验证,并计算天津南港研究区域所设5个站点20年的波高波向分布频率。采用P-III型分布曲线法进行重现期波要素的推算。最后选取2017年8月份的一次天气过程,将FVCOM计算所得的流场加入SWAN波浪模式中。通过设置对照实验,比较分析加入流场前后,波高以及波向的变化。之后分别将两种实验结果与实测结果进行对比,发现加入流之后计算所得的波浪数值结果更加接近实测结果。该研究成果对于提高渤海海域海浪数值模拟与预报精度具有借鉴意义。

The wave model SWAN and current model FVCOM are used with the data provided by WRF as the input.The wave field and current field are calculated in the Bohai Sea from 1997 to 2016.Based on the numerical results,we analyze and contrast the results of several typical gale processes in the past 20 years,calculate the frequency distribution about the wave height and wave direction at 5 sites in Tianjin Nangang research area for 20 years,and select P-III distribution curve to calculate the return period of extreme value of wave elements.We select a weather process in August 2017.The calculated current field by model FVCOM is add to model SWAN.The changes of wave height and direction by setting up a experimental control after adding currents data are then analyzed.The conclusion is similar to that of the predecessors.After comparing the two experimental results with the measured data,we found the results including the current data is closer to the measured one.It can be used as a reference for improving the numerical simulation and forecasting precision of the waves in the Bohai Sea.