The Numerical Simulation Of Wind Waves In Xiamen Bay

When wave propagate the shallow area from deepwater, many phenomena will occur due to the different effect of submarine topography, energy dissipate, bottom friction and current etc, such as reflection, refraction, diffraction, wave breaking, shoaling transformation , non-linearity wave-wave interaction and so on. Since the sediment will be transferred by interaction with tide, wave is one of the most important hydrodynamic factors of harbor engineering. Wave not only change the environment of shallow sea, as well as the coastal production, construction planning, marine transportation, fishery, seaside enterprises, marine tourism and so on. While the development of economy and more and more human activity, ocean engineering, engineering venture, a high quality of the wave forecast is required.This paper used SWAN (Simulating Wave Nearshore) as a mode of numerical simulation to build the Xiamen Bay project. At first, we designed an experimentation plan to study the wind field, water level and tidal current that effect upon the wave growth and propagation, in order to responses the most important influence of depth-induced dissipation, current field and water level to the wave growth and propagation. Second, use SWAN model to simulate the wave field of Taiwan Strait , put the numeral results in use as boundary condition of Xiamen Bay. At last, use the tide simulation results of Xiamen Bay as the initial condition and the waves simulation results of the Taiwan Strait as boundary condition, select the monthly mean wind force in July and the one in October input to Xiamen Bay, fully consider the power input, white capping dissipation, wave breaking, bottom friction and nonlinear wave-wave interaction, we use the SWAN model to simulate the wave field of Xiamen Bay. The result shows as below: First, the height of wave in the northland of Jinmen Island is low because of depth and the blockade of Island.Second, the height of wave in the inboard Xiamen Island is low because of the lee.Third, tidal current is the important influence to the growth of wave.