中文摘要：

丹江口水库因其优良的水质,相对稳定的输水量,以及地势上可以使水自流到北方地区等一些得天独厚的优势被选为南水北调中线工程的水源地。本文选取2002-2015年的42期Landsat TM/ETM＋遥感影像,利用修正型归一化差异指数（MNDWI）提取14a的水库水域的面积变化的动态信息。结果表明,2005年9月丹江口水库大坝开始加高以后的水库面积开始增大;丹江口水库面积的四季变化研究中,秋季丹江口水库水域的面积变化幅度较大,冬季水库水域的面积变化幅度较小,春季和夏季的面积变化幅度相对稳定;丰水期（9-12月）的水库面积的变化幅度较大,枯水期（1-4月）与平水期（5-8月）的水库面积变化幅度较小,丰水期的水库面积总体上大于枯水期与平水期水库水域面积。加强对丹江口水库的水域面积与生态环境保护对我国水资源的空间调度有着十分重要的意义。

英文摘要：

Danjiangkou Reservoir because of its good water quality,relatively stable carrying capacity,and on the ground to artesian water to some unique advantages such as the northern area was selected as the water source of south-to-north water transfer project. This article selects 2002-2015 period of 42 Landsat TM / ETM ＋ remote sensing image,using the fixed type normalized difference index（ MNDWI） extract 14 a changes in the area of the reservoir water dynamic information. The results show that the September 2005 after the Danjiangkou Reservoir dam heightening reservoir area began to increase; The four seasons of Danjiangkou Reservoir area of study,large variations in the area of Danjiangkou Reservoir water,autumn winter variations in the area of reservoir water area is lesser,variations in the size of the spring and summer is relatively stable;Altogether（ Sep to Dec） in the reservoir area of the change of the amplitude is larger,the mutagenicity in April（ Jan-Apr）and level period（ May to Aug）,small variations in the reservoir area of the plentiful reservoir area on the whole is greater than the mutagenicity and level period reservoir water area. Strengthen the Danjiangkou Reservoir water.