The evolution simulation and dynamic geomorphic process analysis of Modaomen Estuary from the 1960s to the 1970s

A long-term morphodynamic model is used to simulate the evolution course of the Modaomen Estuary between 1964 and 1977, by choosing representative condition.The results of the numerical simulation show that Hezhou to Jiaobeisha shallow bank and Shanggou have been fast-filling-up, the deposition thicknesses of the two areas both exceed 40 cm in 13 years. By contrast with the banks, the Mangzhou to Dajingjiao part of Hengzhou Trough and the east-trough of "shanggou" are eroded and enlarged. The evolvement courses of the rainy season and dry season are ultimately different. In the rainy season, banks are filled up and troughs are eroded, but in the dry season banks and troughs are both filled up. In the process of evolution, various rocky islands make the evolution course pluralistic, and human activities have played import roles in the evolution of Modaomen estuary.