中文摘要：

利用长江口深水航道治理一、二期工程实施前后的地形资料，在GIS软件及相关的统计分析软件的支持下，分析了治理工程对横沙东滩冲淤演变的影响。结果表明：横沙东滩在长期的自然演变过程中滩地面积相对稳定，但20世纪90年代中期以来，由于长江来沙量减少，滩地面积出现减小的趋势：深水航道北导堤工程（1998--2000年5月）使横沙东滩的冲淤形势发生了较大的变化：横沙东滩窜沟扭曲、萎缩，白条子沙及其以东浅水区域淤积加剧：促淤工程实彪后，形成了一个有利泥沙沉积的环境，过境泥沙的大量淤积及人工吹泥上滩使得横沙东滩淤长速度显著加快。

英文摘要：

Based on the topographic materials collected before and after the first and second phases of the project that was aimed at improving the deep-water channel of the North Passage of the Yangtze River, this paper analyzed the influence of the project on the erosion-accretion evolution of the Hengsha East Shoal, supported by the GIS and relative statistic software. The results show that the area of the Hengsha East Shoal has leveled off in the process of the natural evolvement, but since the last five years of 1990s, there has been a tendency for the shoal to decrease due to the decline of bedload from the Yangtze River. The north bank project of the deep-water channel has brought great changes to the erosion-accretion situation of the Hengsha East Shoal. The tidal channel of the Hengsha East Shoal became contorted and shrank; the Baitiaozi shoal and some low-water areas to its east accumulated sharply. With the siltation-promoting project brought into effect, conditions for silting are forfiaed in Hengsha East Shoal. The siltation of the bedload flowing through this area and artificially blowing mud up to the shoal make the erosion of the Hengsha East Shoal speed up remarkably.