Numerical Investigation Of The Erosion Of Coastal Sand Dune

Coastal zone resources are important sources of economic income and valuable ecological resources.The protection of coastline and the improvement of marine ecological environment quality and function are also the key points of protecting shoreline resources in recent years.Sand dune is the natural barrier of the coastal erosion of sandy beach.During extreme weather conditions,such as storm waves tends to cause significant dune erosion,therefor the study of dune erosion related theories and technical problems is key to protect the coastline resources.This paper reviewed the related theory and method of coastal dunes erosion in recent years,the mechanics that causes the dune erosion and corresponding influence factors and the recent development progress of numerical models.After validation against two groups of physical experiment,XBeach model is used to numerically study on the coastal dune erosion.The effect of several key factors in the dune profile designing,and the effect of the topographic characteristics of the sand dune profile the under storm wave conditions are analyzed.In addition,the effect of two modes,i.e.,static model and non-hydrostatic modes in XBeach is investigated.In combination with the practical sandy dune nourishment engineering in Golden Dream Bay of Qinhuangdao,SWAN wave model is used to simulate two storm surge wave field and the computed results are adopted to drive the XBeach model.The influence of the arrangement of artificial structures on the nearshore currents and coast evolution is investigated,the corresponding beach nourishment solutions are proposed based on the simulation results.