Studies On The Evolution And Stability Of The Coast Of Hang Zhou Bay

The arc-shaped coast is widely distributing in Hangzhou Bay, and it is an important symbol of shore evolutionaty dynamics. In this thesis, based on the data including remote sensing images in recent30years and historical changes in different times, evolution law of scouring and silting in historical and recent across the Hangzhou Bay was studied. Then parameter-D, which can measure the stability of arc-shaped coast was proposed. And according to the theory of parabolic model, the operating approach about the parameter is provided. At last, combining with the historical evolution across the Hangzhou Bay, the shoreline’s stability was classified, and the tendency was predicted by using the parameter. At the same time, factors of the different stability were discussed. The stability of arc-shaped coast in outlying islands of Hangzhou Bay was preliminary summarized. The progress in thesis are as followed:1) Based on the data of historical changes in recent6000years, combining interpretation of remote sensing images in recent30years, the chart of scouring and silting across the Hangzhou Bay was compiled. Then evolution law was analyzed systematically.2) The parameter(D), which based on the theory of parabolic model and can measure the stability of arc-shaped coast was proposed. The corresponding calculation variables and algorithms were provided, too.3) The parameter(D) applies to the analysis of the shoreline in Hangzhou Bay. The whole state of the north shoreline of Hangzhou Bay is growing to the east and is in the erosion to the north simultaneously. The value of D in the shoreline formed early is greater than the value of D in the shoreline formed late. Guancheng part of Dagu-tang of the south shoreline in the Ming Dynasty was built on the basis of that its arc-shaped coast had reached static equilibrium.