| Technology and Methodology |
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Estimation of soil moisture based on crop water stress index |
| YU Wendan1, ZHANG Youjing1,2, ZHENG Shuqian3 |
1. School of Earth Sciences and Engineer, Hohai University, Nanjing 210098, China;
2. State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineer, Hohai University, Nanjing 210098, China;
3. Zhejiang East China Surveying and Mapping Co. Ltd, Hangzhou 310030, China |
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Abstract In this paper, the authors calculated the amount of the actual evapotranspiration based respectively on double layer model and improved double layer model in consideration of the available water rate of soil with MODIS data and meteorological data so as to investigate the temporal and spatial distribution of soil moisture and dynamic changes in Xuzhou City, Jiangsu Province. The amount of the potential evapotranspiration was calculated by using Penman-Monteith formula. Models were built to estimate the relative content of water of Xuzhou in July and November 2010, by crop water stress index(CWSI) obtained by the actual evapotranspiration and the potential evapotranspiration. The result shows that the relative error of the estimated data based on the improved double layer model and that of the measured data are 3.47% and 6.03% respectively, with the correlation coefficient being 0.84 and 0.84, which are better than the results obtained by the model based on the double layer model, whose relative error is 5.89% and 9.6%, and whose correlation coefficient is 0.53 and 0.72.
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| Keywords
remote sensing
ZY1-02C satellite
hydrogeology
Karst water resources
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Issue Date: 23 July 2015
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2015,
Vol. 27
