关键词: 东山湾, 诏安湾, 八尺门海堤, 贯通, 模型, 泥沙, Dongshan Bay, Zhao’an Bay, Bachimen seawall, project of excavation, model research, sediment

Abstract: Sea water exchange between Dongshan Bay and Zhao'an Bay is blocked by Bachimen seawall, where the seawater and environment of marine ecology is worse and worse. So Zhangzhou Municipal Government proposes to implement the Project of Excavation of Bachimen Seawall. This research calculated the scouring and silting law of Bachimen waterway before and after implementing the project of excavation by Jiaju Liu formula. Then the characteristics of Dongshan Bay and Zhao'an Bay hydrological dynamics were studied, based on which the effect of demolition and desilting to environment of Bachimen waterway was analysed. The results showed that hydrodynamic conditions would be changed in Bachimen waterway and its adjacent waters after demolition and desilting, where the projiect area would scour about 4 m depth, and the final depth would be up to 10.2 m, the both side of project will scour about 5~6 m depth, east and west sides of entrance would scour about 1~2 m depth, and erosion environment would become aggressive environment, which would change the status of ecological deterioration and promote the sustainable use of marine resources.