南水北调中线供水区水域面积变化遥感分析

Remote sensing analysis of water area changes in the water supply region of the Middle Route of the South-to-North Water Diversion Project

为更好地研究调水对供水区域水域面积的影响,利用遥感技术研究了南水北调中线工程调水前后供水区及其下游四季的水域面积变化情况及其动因。研究表明:在调水工程实施之后,汉江中下游区域出现了水域面积大幅度下降的情况,汉江流域水域面积从2011年到2015年整体减少,尤其是春夏季水域面积减少最多,春季减少52.6km^(2),夏季减少65.8km^(2),减少比例达到17.3%,秋季和冬季水域面积减少幅度较小,秋季水域面积减少23.4km^(2),冬季水域面积减少最少,为4.2km^(2)。

In order to better study the impact of water diversion on the water area of the water supply region,remote sensing technology was used to analyze the changes in water area and its causes in the supply region and downstream areas of the Middle Route of the South-to-North Water Diversion Project before and after water diversion.The study shows that after the implementation of the water diversion project,there was a significant decrease in the water area in the middle and lower reaches of the Hanjiang River.The water area of the Hanjiang River basin decreased overall from 2011 to 2015,especially in the spring and summer seasons.In spring,the water area decreased by 52.6km^(2),and in summer by 65.8km^(2),amounting to a reduction of 17.3%.The decrease in water area was less in autumn and winter,with a reduction of 23.4km^(2)in autumn and the smallest decrease of 4.2km^(2)in winter.