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

机译：太湖流域遥感水量估算

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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 0.4-9.6% for the whole basin, and 0.5-3.7% for Lake Taihu.
机译：太湖流域位于长江流域的下游。近年来，太湖地区经常发生严重污染，需要评估流域的总体水平衡。蒸发蒸腾（ET）和降水是水平衡估算中的关键要素，可为水的可利用性提供科学可靠的信息。当前，卫星遥感被广泛用于这两个参数的估计。在这项研究中，利用遥感和观测径流的降水和ET来估算2005年至2007年太湖流域水预算的年度变化。全球降水卫星图（GSMaP）数据用于估算空间降水。太湖流域的时间变化。在这项研究中，采用具有地形校正的表面温度归一化植被指数（Ts-NDVI）三角法估算了ET。从水文站观测到径流。 ET是太湖流域水预算组成部分中最大的消耗量。对于整个流域，2005年至2007年的ET /降雨比约为0.85-0.95，而太湖的约为1.2-1.4。总体来说，流域水平衡的收入条件包括降水和长江入流应等于流出条件，包括ET，流出和蓄水。但是在太湖流域，收入项通常比支出流项大，整个流域的失衡率约为0.4-9.6％，太湖的失衡率为0.5-3.7％。

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