ETWatch的模型与方法

流域水量平衡分析是水资源现状评价与水资源合理调度研究工作中的一个核心。本文基于遥感技术估算的蒸散，结合监测统计数据，提出了流域耗水平衡方法，以海河流域为例进行了2002-2007年流域及子流域的耗水平衡分析，流域多年平均蓄变量为-62.3亿方，其中农业生产是流域水资源消耗的主要大户，占耗水总量的54.3%，年际变动范围较小（-5%~8%）。通过流域蓄变量变化和流域蒸散结构的分析，揭示海河流域存在的水资源问题，为流域水资源管理和节水型社会建设提出建议。

ETWatch: models and methods

The basin level water balance analysis is the core of the water resource evaluation and rational management. In this paper, based on evapotranspiration estimated by remote sensing,combining statistic data, a method of basin level water consumpiton balance is presented. As a case, the water consumption balance in Hai River Basin from 2002 to 2007 is analyzed, and the average water storage change is -6.23 billion cubic meters. The agriculture sector is one of the biggest consumers of water resources,accounting for 54.3% of the total water consumption, and the inter-annual change ranges are lower(-5%~8%). The water resources problems are discussed in this paper according to the analysis of changes of water storage and evapotranspiration structure, and some suggestions for region water source management and water saving society construction are proposed.