中文摘要：

为了解东洞庭湖近年水域面积的时空变化规律和三峡工程对东洞庭湖水域面积及空间分布的影响，利用MODIS影像的250m分辨率数据，提取了东洞庭湖2002-2012年偶数年份的水域面积，在分析东洞庭湖水域面积的月、季节变化规律的基础上，分析东洞庭湖水域消落带的空间变化特征，并将东洞庭湖水域面积与三峡水库水域面积的变化进行对比。结果表明：东洞庭湖水域面积通常表现为夏季最大，春秋次之，冬季最小，且水域消落带主要分布在东洞庭湖南部湖区；三峡工程蓄水前后，三峡水库和东洞庭湖水域面积的相关性发生了改变，即三峡水库蓄洪之前，其水域面积与东洞庭湖水域面积未出现同步变化的现象，蓄洪之后，2个水域面积的变化呈现明显的相关性。

英文摘要：

MODIS images of 250 m resolution data were employed to know the spatio-temporal variation ot water areas in East Dongting Lake and evaluate the impact of Three Gorges project on it. The water areas of East Dongting Lake and Three Gorges Reservoir were extracted every even month from a long-term period of 2002-2012. The spatio-temporal variation of water areas of East Dongting Lake was analyzed, and the distribution of seasonal hydro-fluctuation belt in East Dongting Lake was discussed. Based on the comparison of water areas variation between the East Dongting Lake and Three Gorges Reservoir, a possible way to assess the impact of the Three Gorges project was proposed. The results showed that the variation of water areas in East Dongting Lake was maximal in summer, and next in spring and autumn, while, it was minimal in winter. The hydro-fluctuation belt of East Dongting Lake mainly distributed in the southern regions of the lake during 2002 and 2012. The water areas in Three Gorges Reservoir and in East Dongting Lake showed a positive correlation in summer and in winter, but they showed a negative correlation in spring and in autumn.