中国海岸侵蚀特点及侵蚀加剧原因分析

中国海岸侵蚀具有普遍性、多样性和加剧发展等三个特点，侵蚀岸线长度占全国大陆岸线的１／３以上，尤以渤海和黄海沿岸较重。但因沿海泥沙来源丰富、堆积条件较好，使总体侵蚀强度通常稍轻于国外许多海岸。中国海岸的侵蚀因素有海平面上升、风暴潮加剧、入海泥沙减少和多种不合理的人为开发活动等９种，其中７种与全球变化有直接或间接关系。它们主要通过增强海洋动力作用、减少沿岸泥沙和降低海岸稳定性三个原因，加剧海岸侵蚀。

THE CHARACTERISTICS OF COASTAL EROSION AND CAUSE OF EROSION

Coastal erosion is characterized by popularity,diversity,and aggravation.Intense erosion happens along the coast of Bohai Sea and Huanghai Sea.The length of eroded coastal line amounts to one third of entire coastal line of China.However coastal erosion in China is slightly less intense than other countries due to plentiful source of sediments and favorable deposit condition,There are 9 factors which cause coastal erosion in china,such as sea level rise,storm surge,reduction of sediment source and unreasonable human activities.7 of 9 factors interact directly or indirectly with global change,which aggravate coastal erosion through reducing coastal sediment,crippling coastal stability and enhancing ocean dynamic forces.