HJ-1A/B卫星在干旱应急监测中的应用

利用我国环境与灾害监测小卫星(HJ-1A/B)的CCD和IRS数据,提出了针对这种新数据源的适用性应用方法,基于成熟应用的植被健康指数,对2010年3月湄公河流域发生的干旱进行应急监测,结果表明湄公河流域大部分区域农田发生干旱,中国无论从旱情发生面积和干旱严重程度上都是最为严重的。着重分析流域上游中国境内的4个水电站的水面和水位的变化信息,探讨对下游干旱的影响,得出上游大坝建设与流域下游干旱并无直接关系的结论。进一步说明了环境与灾害卫星在干旱监测应用中的可行性,将为我国乃至全球决策部门提供辅助支持信息。

HJ-1A/B Satellite Application on Drought Emergency Monitoring

The study is aimed to use CCD and IRS data on HJ\|1A/B satellite to monitor drought.It proposed the adapted application method for this new data source.Based on Vegetation Health Index which has been well applied in the world,the HJ data were used to monitor the emergency drought in Mekong river basin on March,2010.The result showed that the regional drought occurred in the majority of farmland in the Mekong river basin,and the region in China is the worst in terms of size and severity of drought.The changes on water area and water level in four hydropower stations which are located in the upstream of the basin were analyzed to discuss the hot topic:“Does upstream hydropower dams cause the current drought in Lower Mekong basin?” The result drew a conclusion that the dam construction was not directly related to the drought in Mekong river basin.This study showed the feasibility of HJ satellite applications on drought,and it would provide supplementary support information for policy\|making departments in China,even in Global.