一个风暴潮数值模式及其开边界问题

在文献1]的基础上,本文设计了一个风暴潮数值模式,并讨论了在近岸海洋动力学计算中具有普遍意义的开边界问题.所用的计算格式在有开边界和不规则海岸边界的情形下,仍能较好地保持原海流问题的质量和能量变化关系,因而具有较好的计算稳定性和计算精度.本文计算了“7203”号和“8509”号台风暴潮,并与实况相比较,所得计算结果图象清晰地再现了渤海这两次台风增水过程的基本特征.

A Numerical model of Storm Surges and Its Open Boundary Problems

On the basis of Reference 1], a numerical computational model is designed by using the grid-telescoping method for numerical simulation of storm surges . The open boundary problem being of universal significance in computations of coastal ocean dynamics is emphatically discussed, The difference scheme used in this model preserves the properties of mass and energy variation of original off-shore flow problems including open sea boundary and irregular coastal boundary, therefore the model has high computational stability and accuracy.Numerical experiments are performed with this model to simulate the surges generated by typhoons No. 7203 and No. 8509 which affected the Bohai Sea coast. Comparisons between observed and computed surges show that the simulated results reproduce the main features of the two typhoon surge histories. The computed stream fields under typhoon in Bohai Sea are also very clear.