Simulation of Erosion and Deposition in Sandy Coasts by Combining Geoscience and Dynamic Methods

Abstract

Chen, W.; Kong, J., and Zhang, W., 2020. Simulation of erosion and deposition in sandy coasts by combining geoscience and dynamic methods. In: Malvarez, G. and Navas, F. (eds.), Global Coastal Issues of 2020. Journal of Coastal Research, Special Issue No. 95, pp. 202-208. Coconut Creek (Florida), ISSN 0749-0208.In order to analyze the sediment erosion and deposition caused by engineering construction in sandy coastal, combined Geoscience and dynamics model was creatively used. By introducing four distributions of the granularity parameters and grain size trend analysis (GSTA) model, the possible migration paths of bottom sand in and around the harbor engineering area were obtained. Then the net migration direction of bottom sand was obtained by using the grain-size trend vector method, and its rationality was proved by comparing with the normal wave direction in this area. Futher more, the effects of engineering on the scouring and silting of bottom sand in the surrounding sea area were simulated by dynamic numerical model based on the dominant direction wave condition. The possible silting positions were deep analyzed. It can be found that the intensity of the current was reduced by the construction of the breakwaters, and the deposition in the reclamation area can be effective controlled. The depositional intensity outside the area was obviously weakened.