The Study Of Optimization Of Bottom Friction Coefficient Of Tide Model In The Bohai Sea, The Yellow Sea And The East China Sea

The harmonic analysis along satellite orbit are used to withdraw tidal wave from TOPEX/POSEIDON satellite altimeter data in the Bohai Sea, Yellow Sea, East China Sea and South China Sea. The harmonic analysis results of eight tide components,fifteen tide components and nineteen tide components are compared one another. Compared with the data of the tide stations, the results of nineteen tide components agree with the observation better when the depth between 200m and 500m. The system of prediction of tides are studied.Adjoint method was used to optimize the bottom friction coefficients (BFC) of the Bohai Sea,the Yellow Sea and the East China Sea when the BFC was constant and when the BFC were independent. Five experiments(E1,E2,E3,E4,E5) are done for six different BFC assumptions: E1. the BFC is constant from Kristofer et al; E2. the BFC is constant optimized; E3. 120 independent BFC are choose, and the BFC of other grids is obtained through linear interpolation with the independent BFC; E4. 80 independent BFC are choose, and the BFC of other grids is obtained through linear interpolation with the independent BFC; E5. the BFC are supposed to be different in different grids.The experimental results demonstrated that, comparing with the constant, the BFC with spacial distribution can obtain higher simulation accuracy. Comparing with uniformly selecting, higher accuracy can be obtained even though the number of independent BFC is reduced from 120 to 80. The results of E5 are the best of all the experimentsThe BFC distribution of the Bohai Sea, the Yellow Sea and the East China Sea obtained form the experiments indicate that the BFC value is larger...