Simulating wind wave field near the Pearl River Estuary with SWAN nested in WAVEWATCH
Simulating wind wave field near the Pearl River Estuary with SWAN nested in WAVEWATCH
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发表时间：
2013
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通讯作者：
Wang Le-ming
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作者：
Wang Le-ming
基于美国宇航局遥感海面风场交叉校准多平台（CCMP），嵌套在WAVEWATCH中的模拟近岸波浪（SWAN）对珠江口附近的风浪场进行模拟，将有效波高、波周期、波向的数值结果与实测数据进行定量比较，发现有效波高的平均绝对误差为15.4 cm，散射指数（SI）为0.240相关系数为0.925；波周期的平均绝对误差为1.9 s，SI为0.433，相关系数为0.636；波向的平均绝对误差为23.9°。因此，数值结果与实测波高和波向一致。但由于第三代波浪模型的缺陷，计算的波周期小于实测周期。一般采用数值模型本文提出的计算方法可以有效地模拟珠江口附近的波浪场。此外,通过6个实例研究了不同计算方法和不同风场对数值结果精度和计算效率的影响,说明本文的计算方法和CCMP风场可以有效提高数值结果。
Based on the cross calibrated multi-platform(CCMP),a remotely-sensed sea-surface wind field by NASA,wind wave field near the Pearl River Estuary is simulated with Simulating WAves Nearshore(SWAN) nested in WAVEWATCH.The numerical results of significant wave height,wave period and wave direction are compared with the measured data quantitatively.We find that for significant wave height,the mean absolute error is 15.4 cm,Scatter Index(SI) is 0.240 and the correlation coefficient is 0.925;that for wave period,the mean absolute error is 1.9 s,SI is 0.433 and the correlation coefficient is 0.636;and that for wave direction,the mean absolute error is 23.9°.Therefore,the numerical results are in agreement with the measured wave height and wave direction.However,due to the drawbacks of the third generation wave models,the calculated wave period is shorter than the measured period.Generally,the numerical model used in this paper can simulate the wave field near the Pearl River Estuary effectively.In addition,the influences of different calculation methods and different wind fields on the precision of the numerical results and on the calculation efficiency are studied using six cases.It is illustrated that the present calculation method and the CCMP wind field can effectively improve the numerical results.