Numerical Simulation Of Wave, Tidalcurrent And Sediment Of Estuary And Coast

The computer simulation of tidal current field, wave field, sediment transport, deformation of sea bed and thickness of erosion-sedimentation under interaction of waves and currents are studied. The procedure of process simulation are developed and applied in Jiaozhou Bay and sea area of Gudong oilfield, simulation results are reasonable and satisfied to those sea area. A theoretical bottom shear stress for a wave-current coexisting system is derived by means of the theory of boundary layer assumption. The condition of incipient movement of sand particles equation, the sediment carrying capacity equation and bed load discharge equation also have been obtained. The stochastic-numerical model is carried on, the stochastic analysis is taken into account in the input and the uncertainty analysis and sensitivity analysis of the output are conducted. Formula of confidence interval is derived.The main work accomplished in this dissertation are as follows: According to the different characteristics of tidal currents and waves motion scales in space and time, the method of multiple scales in singular perturbation theory has been introduced to separate Novier-Stokes equation and the qualitative transmission equation. The shallow water current equations under function of waves, the shallow water wave equations under function of tidal level and current and the suspended sediment diffusion equation under interaction of waves and currents are obtained. The 2-D numerical model of tidal current is developed and the method of ADI is applied to separate the equations. Utilizing small parameter method and variation principle, the mild-slope equation in presence of current is derived. Based on above equations, a refraction-diffraction combined numerical model of wave is given. Numerical simulation model of sedimentation under interaction ofwave and current is developed. Bottom shear stress equation, the condition of incipient movement of sand particles equation, the sediment carrying capacity equation and bed load discharge equation have been derived.? A system of ocean power-geomorphic deformation taken chief controlling module as core and based on procedure-base, knowledge-base, data-base, experts system is developed and this system realizes process simulation-automatization.? Stochastic-numerical model is carried on and applied in calculating current field of Jiaozhou Bay, the value of long-term variation and confidence intervals of tidal level and velocity are obtained.? The mathematical model of sediment transport, deformation of sea bed and thickness of erosion-sedimentation is applied in Jiaozhou Bay and sea area of Gudong oilfield, the simulation results are reasonable and satisfied to those sea areas.