NUMERICAL SIMULATION OF TYPHOON WAVES AROUND THE WATERS OF THE YANGTZE ESTUARY-A CASE STUDY OF TYPHOON RUSA AND TYPHOON SINLAKU

摘要

The third-generation wave model SWAN, which is based on the energy balance theory, is applied to the waters around the Yangtze Estuary for simulation of typhoon waves. SWAN wave model in curvilinear grids is better for complicated topographies than that in rectangular grids. Due to the complicated topographies in the Yangtze Estuary, curvilinear grids are adopted. Calculating precision can be improved by using curvilinear grids, not adding much calculating quantity simultaneously. Typhoon waves around the waters of the Yangtze Estuary are numerically modelled under the weather of Typhoon Rusa and Typhoon Sinlaku. A comparison with the significant wave height processes at an outer-sea buoy shows that SWAN model has good applicability in the waters around the Yangtze Estuary. Distributions of significant wave height of typhoon waves in the Yangtze Estuary, during the Typhoon Rusa and Typhoon Sinlaku have been analyzed respectively in the paper. The results can well reflect some characteristics of typhoon-wave propagation and wave height distribution, which means that typhoon waves around the waters of the Yangtze Estuary can be rationally simulated by SWAN wave model.