渤海湾风浪场的数值模拟

Modeling of Wind Waves in the Bohai Bay, China

采用SWAN模型对渤海湾在定常风和非定常风作用下的波浪场进行了模拟,并利用黄骅港附近波浪统计资料对模拟结果进行了验证。结果表明:SWAN模型较好地模拟了渤海湾在定常风和非定常风作用下风浪成长和传播过程。此外,还应用ADCIRC潮流模型,初步探讨了潮流对波浪要素的影响:(1)无流存在时,波高的成长和波周期的变化是一条光滑的曲线,但当有流加入时,由于其流速和水位在一个潮周期内随时间的变化是不均匀的,其对波浪成长产生影响,使波高和周期呈不规则变化;(2)波浪成长初期,流对波高增长的影响并不明显,但当波高增大到一定程度时,流的存在对波高的影响是很明显的。

The SWAN model was applied to predict steady and unsteady wind-induced waves in the Bohai Bay. Modeled results were verified by measured statistic data from the Huanghua Harbour. It was suggested that the SWAN model could well simulate the development and propagation of steady and unsteady wind-induced waves. Furthermore, the ADCIRC tidal model was used to examine how tidal currents would affect modeled wave parameters: ( 1 ) Wave heights and wave periods are developing smoothly without currents, while wave heights and wave periods would change irregularly because variations in tidal current velocity and elevation are not uniform and thus would have affected waves; ( 2 ) At the early stage of wave development, tidal currents have no significant effects on wave heights, but would have significant effects on wave heights when wave heights are increasing.