辐射应力在黄河三角洲近岸波浪和潮汐风暴潮相互作用中的影响

EFFECTS OF RADIATION STRESS IN THE INTERACTION OF COUPLED WAVE-TIDE-SURGE IN THE COASTAL AREA OF HUANGHE DELTA

基于考虑辐射应力机制的近岸高分辨率的波浪和潮汐风暴潮相互作用耦合数值模式 ,研究了辐射应力在黄河三角洲胜利油田近岸海域波浪和潮汐风暴潮相互作用过程中对水位的影响 ,并与两个中等强度天气过程引发的实测水位过程进行比较。结果表明 ,考虑辐射应力机制的波浪和潮汐风暴潮相互作用耦合模式模拟的结果与实测更接近 ,特别在极值增水位处吻合很好。对本研究的中等强度天气过程 ,辐射应力可增水 40cm ,在黄河三角洲近岸区有 2 0cm以上最大增水区域 ,这在工程上非常重要。可以预见 ,对引发黄河三角洲沿岸强增水的台风及强寒潮过程 ,辐射应力对增水的影响会更明显。本研究结果表明 ,在实际工程应用中 ,应采用波浪和潮汐风暴潮相互作用耦合数值模式。

Based on a coupled wave tide surge interaction numerical model, the effect of radiation stress on elevations in the interaction of wave tide surge in the coastal area of Huanghe Delta was studied. A comparison of simulated and measured elevations for two mediate strong weather demonstrated that the result simulated by the coupled wave tide surge model including radiation stress is close to the measured and particularly in excellent agreement with the extreme set up. This study shows that the radiation stress can increase sea level by up to 40cm and there is an area of over 20cm sea level increase in the Huanghe Delta area, which is very important for engineering. It is expected that for a strong cold wave weather or typhoon causing strong set up in the Huanghe Delta coastal area, the effect of radiation stress will be more significant. It is suggested from this study that in the practical engineering application, coupled wave tide surge interaction should be considered.