基于SWAN模式的中国近海波浪模拟修正研究

Study on the calibration of wave field simulation in the China adjacent sea based on SWAN model

本文基于IFREMER中的卫星实测数据,配合非结构化三角网格,对SWAN模式中的风能输入、白帽耗散、底摩擦导致的能量耗散项及相关参数在中国近海进行了敏感性分析和适应性修正,修正模型的适用性通过25年的数值试验得到了验证。研究结果表明,NCEP再分析风速在目标海域与实测数据有较好的一致性,可用作波浪数值模拟的强迫风场;风能输入及白帽耗散均采用Komen模式,系数值为1.86×10^(-5),是适用于该海域的最优参数组合;COLLINS模型及其默认参数最适用于中国近海考虑底摩擦导致的能量耗散;修正后SWAN模型模拟有效波高的精确度提升且具有很好的适用性。

Based on the observations originated from satellites and archived in IFREMER,the sensitivity analysis and adaptive modification were conducted on the wind input source term,dissipation caused by white-capping and bottom friction and their parameters of SWAN model with unstructured mesh grid in the China adjacent sea.The applicability of the modified model was validated by performing 25 years numerical simulation.Results indicated that the reanalysis wind speed data from NCEP were consistent with observations in China sea and could be used as the wind forcing for wave simulation.The Komen pattern with the coefficient of 1.86×10^(-5) for both the wind input source term and the dissipation caused by white-capping was considered as the optimal parameter combination for this sea area.As for calculating the dissipation due to the bottom friction,COLLINS model with default parameter was the most suitable.And the calibrated SWAN model was stable and could simulate the significant wave height more accurately in the China adjacent sea.