一、海岸线告急中国3.2万公里的海岸线,无论基岩海岸、淤泥海岸、沙岸、河口海岸、珊瑚礁海岸,几乎都受到海岸侵蚀的威胁,开阔海岸的海滩和河口三角洲尤为严重。海岸线上的省市均有不同程度的受侵蚀。辽宁　新金县皮口镇自70年代始,因采砂石使岸线后退,速率为每年0.5～1米;大窑 1. Coastline Urgently Nearshore The coastline of 32,000 kilometers in China is almost always subject to the threat of coastal erosion, regardless of bedrock coast, silt coast, sandy beach, estuarine coast and coral reef coast. The beaches and estuarine deltas along the open coast are particularly serious. Coastal provinces and cities have varying degrees of erosion. Piaokou Town, Xinjin County, Liaoning Province Since the 1970s, the coastline has been receding due to the use of gravel, at a rate of 0.5 to 1 meter a year.