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WAM, SWAN and WAVEWATCH III in the Finnish archipelago – the effect of spectral performance on bulk wave parameters
Journal of Operational Oceanography ( IF 3.1 ) Pub Date : 2019-06-29 , DOI: 10.1080/1755876x.2019.1633236
J.-V. Björkqvist 1 , O. Vähä-Piikkiö 1 , V. Alari 2 , A. Kuznetsova 3 , L. Tuomi 1
Affiliation  

WAM, SWAN and WAVEWATCH III® were implemented to the Finnish archipelago with a 0.1 nmi grid. A comparison with coastal wave buoy observations showed that the models agreed on the significant wave height, with biases and root-mean-square-errors (RMSE) differing at most 0.06 m. In a general sense, WAM propagated most long wave energy into the archipelago, while SWAN generated the highest local waves. The performance of WAVEWATCH III was wind direction dependent. The model tendencies caused them to disagree on the peak period near the coast, with differences in mean values being up to 1.4 s. The large scatter (RMSE>2 s) inside the archipelago was mostly explained by the ill-defined nature of the parameter in more complex wave conditions. The mean period had less scatter (RMSE<1.5 s), but changes in the upper integration frequency from 0.6 Hz to 1 Hz affected the bias by roughly 1 s in all models. WAM and WAVEWATCH III underestimated the high-frequency wave energy for certain wind directions, possibly because of a too small friction velocity. A wind forcing taken every 3 h from a 7.4 km operational atmospheric model was found to be sufficient to force the high-resolution wave models.



中文翻译:

芬兰群岛的WAM,SWAN和WAVEWATCH III –频谱性能对体波参数的影响

WAM,天鹅WAVEWATCH III ®在0.1 nmi网格的芬兰群岛实施。与沿海海浪浮标观测值的比较表明,这些模型在有效海浪高度上一致,偏差和均方根误差(RMSE)的差异最大为0.06 m。从一般意义上讲,WAM将最长的波浪能量传播到群岛,而SWAN产生最高的本地波浪。WAVEWATCH III的性能取决于风向。模型趋势使他们在海岸附近的高峰时段上意见不一致,平均值差异最大为1.4 s。群岛内部较大的散射(RMSE> 2 s)主要是由于在更复杂的波浪条件下参数的不确定性造成的。平均周期的散布较少(RMSE <1.5 s),但较高的积分频率从0开始发生变化。在所有型号中,6 Hz至1 Hz都会影响偏置大约1 s。WAM和WAVEWATCH III低估了某些风向的高频波能量,这可能是因为摩擦速度太小了。发现从7.4 km的大气模型中每3小时进行一次强风吹扫就足以迫使高分辨率波浪模型产生作用。

更新日期:2020-04-14
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