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Estimation of water budget by remote sensing in Taihu Basin, China

机译：中国太湖盆地遥感估算水预算

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摘要

Taihu Basin is located in the lower reach of the Yangtze River basin. Recent years, severe pollution in Lake Taihu was frequently occurred, which need to evaluate overall water balance of the basin. Evapotranspiration (ET) and precipitation are the key elements in water balance estimation that give scientifically sound information on water availability. Currently, satellite remote sensing is widely used for estimation of these two parameters. In this study, precipitation and ET from remote sensing and observing runoff are used to estimate annual variations in the water budget of the Taihu Lake Basin from 2005 to 2007. The Global Satellite Mapping of Precipitation (GSMaP) data was applied to estimate precipitation in spatial and temporal variability of the Taihu Basin. The surface temperature-normalized difference vegetation index (Ts-NDVI) triangle method with topographic correction was used to estimate ET from MODIS datasets in this study. Runoff was observed from hydrological station. The ET is the largest consumption in water budget components over Taihu Basin. For the whole basin, the ratio of ET/Rainfall is about 0.85-0.95 from 2005 to 2007, and it is about 1.2-1.4 for Lake Taihu. In general, the income terms of water balance in the basin including precipitation and inflow from Yangtze River should be equal to outgo terms including ET, outflow and water storage. But the income terms is mostly larger than outgo terms in Taihu Basin, the imbalance percentage is about 0.4-9.6percent for the whole basin, and 0.5-3.7percent for Lake Taihu.
机译：太湖盆地位于长江盆地的下游。近年来，太湖湖的严重污染经常发生，需要评估盆地的整体水平。蒸散蒸腾（ET）和降水是水平衡估计中的关键要素，提供有关水可用性的科学声音信息。目前，卫星遥感广泛用于估计这两个参数。在本研究中，从遥感和观察径流的降水和et估计从2005年到2007年估计太湖盆地水预算的年度变化。降水（GSMAP）数据的全球卫星映射被应用于空间中的降水和太湖盆地的时间变异性。具有地形校正的表面温度归一化差异植被指数（TS-NDVI）三角形方法用于从本研究中的MODIS数据集估算等。从水文站观察到径流。 ET是太湖盆地水预算成分的最大消费量。对于整个盆地，2005年至2007年的ET /降雨量约为0.85-0.95，为太湖湖约1.2-1.4。一般而言，盆地中的水平的收入条款包括降水和长江流入的介绍应等于普通术语，包括ET，流出和储水。但收入条款大多大于太湖盆地的出口术语，不平衡百分比为整个盆地的0.4-9.6％，为太湖湖0.5-3.7。

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