2-D Numerical Model Of Sudden Siltation Due To Storm And Its Application

There are many coastal infrastructures in China, which are attacked frequently by varying typhoon. During the typhoon attacking, the sediment on beaches in nearshore zone are easily suspended and transported by large waves and storm surge. The sudden siltation can occur due to sediment deposit in channel, which may cause serious effects on the harbor navigation and operation. During typhoon and storm surge process, the sediment transport is very complex. Resonable simulation of the sediment transport process will be very important to predict the sudden siltation of harbor and channel accurately. Therefore, a whole hydrodynamic simulation and sediment transport model, which can reflect the mutual effect among wind, wave and tidal current, is developed in this paper. It can be used to predict the sudden siltation due to storm process, and to provide reliance for coastal engineering design.In this paper, the typhoon wind field and atomspheric pressure field model, the ADCIRC model for tidal current simulation, the SWAN model for wind waves simulation and the sediment-carrying capacity model are firstly introduced. After the analysis of the natural conditions of the coastal project in Cangnan, Zhejiang, the 2-D numerical model of sudden siltation is developed and verified by using measured data in site.At last, the numerical model of sudden siltation due to storm is applied to simulate the channel siltation of Cangnan power plant coal harbor. The 10-year return period sudden siltation condition is discussed, and the sudden siltation for different channel design plans are simulated and analyzed. It is shown that the model can reflect the fact of sediment transport and sudden siltation in the typhoon process. The simulated results can be used to guide engineering practice.