COASTAL EROSION AND ITS MAIN CAUSE IN THE QINHUANGDAO AREA

The paper analyzes coastal erosion and silting up in the Qinhuangdao area and discusses the constraints on coastal erosion and silting and their harm to coastal resources and environment based on information obtained from on-site investigation.The main conclusions are as follows:in the past 50-odd years,the 123.5km long coastline of Qinhuangdao has undergone six activities of erosion and silting up in different forms,of which the 82.69km long coastline has undergone erosion to various degrees,accounting for 67% of its total.Besides the storm tide impact,the main causes for coastal erosion are due to the continued decrease of material supply and manual extraction of sand and gravel.Coastal erosion can seriously destruct tourism resources and land resources and aggravate invasion of seawater besides threatening the safety of coastal engineering facilities.