渤海波浪和潮汐风暴潮相互作用rn对波浪影响的数值研究

摘要

This paper developed a joint numerical model of wave and tide-surge motion.The model consists of an advanced third generation shallow water wave model and a th ree dimensional tide-surge model,taking into account all wave-current interact ions and time varying depth.The joint interaction was carried out by running the two models interactively,exchanging calculated data of sea parameters at regula r time intervals.The joint model was applied to the Bohai Sea.For the typical we ather cases,influence mechanisms of wave and tide-surge interaction on waves an d quantitative estimates of magnitude were obtained.The results demonstrate that the influence nature and magnitude vary with weather conditions; for the cases of moderate intensity,the effects of wave-tide-surge interaction on waves are mainly dominated by tides,but for strong cold waves,the effects of wave-tide-s urge interaction on waves are mainly dominated by storm surges and in these case s both storm elevation and currents have some effects on waves,to a certain de gree.At the Huanghe River mouth,the effects of storm set up and currents on wave s are inverse and partially cancel out,weakening the interaction effects;in gene ral，for strong cold wave cases,wave height maximum modulation can reach 1m,and a t the Huanghe River estuary up to 0.5m;for weak weather cases,wave height maximu m modulation is around 0.2m.The results computed by the joint model are in good agreement with measured data.%基于依赖波浪成长状态波令的表面风应力，提出了一个波浪和风暴潮 潮汐运动相互作用的联合数值模式，实现了第三代波浪模式和三维风暴潮潮汐模式联合作用 的数值研究，并结合渤海典型天气个例的研究，给出了渤海波浪和风暴潮潮汐相互作用对波 浪影响的机制和大小量级的定量估计。研究表明，对不同天气过程，波浪和风暴潮潮汐相互 作用对波浪影响的性质和大小不同；对强寒潮过程，对波浪影响主要由风暴潮所支配，波高 调制可达1m，在黄河口区一般达0.5m；对弱天气过程，对波浪影响主要由潮所控制，波高调 制约在0.2m，联合作用模式给出的结果与实测更吻合。