机构地区: 华东师范大学河口海岸科学研究院河口海岸学国家重点实验室
出 处: 《海洋科学进展》 2011年第3期339-345,共7页
摘 要: 利用ArcGIS技术对20世纪60年代以来的南渡江水下三角洲地形资料进行冲淤分析,并探讨冲淤变化的主要原因。研究表明:1963—1980年、1980—1996年和1996—2003年3个时段南渡江水下三角洲的淤积/侵蚀面积比分别为2.2,1.1和0.73,净淤积速率分别为4.17,~0.002和~2.2 cm/a。这种从淤积为主向侵蚀为主的转变主要归因于人类活动引起的河流入海泥沙急剧减少。 The erosion and accretion of the Nandu River Underwater Delta is analyized by means of ArcGIS technique and based on the underwater topography data collected since 1980s and the main reason is discussed. The results show that during the periods of 1963--1980, 1980--1996 and 1996--2003, the accretion area to the erosion area in the Nandu River Delta is 2.2, 1.1 and 0.73, respectively. The net accretion/erosion rates (negative value means scouring) in the three periods are 4. 17 cm/a, -0. 002 cm/a, -2.2cm/a, respectively. The change from accretion to erosion is mainly attributed to the rapid decrease of the sediment supply from the Nandu River, which is caused by the human activities.