Estimation of agricultural flood irrigation water consumption in the Heihe River Basin, China, using satellite based daily land surface evapotranspiration and soil moisture

文献类型： 外文期刊

第一作者： Huo, Lirong

作者： Huo, Lirong;Song, Lisheng;Wang, Zuo;Xie, Qiaoyun;Sun, Liang;Tao, Sinuo;Liu, Shaomin;Li, Yan

作者机构：

关键词： Agricultural water management; Improved soil moisture to rain (SM2RAIN); methodology; Soil moisture coupled two-source energy bal-; ance model; Remote sensing

期刊名称：JOURNAL OF HYDROLOGY-REGIONAL STUDIES （ 影响因子：5.0； 五年影响因子：5.3 ）

ISSN：

年卷期： 2025 年 60 卷

页码：

收录情况： SCI

摘要： Study region: The Heihe River Basin, China. Study focus: Irrigation data are often from census surveys at coarse administrative or river basin scale, and as such, the amount of water used for agricultural irrigation difficult to quantify. We improve the Soil Moisture to Rain (SM2RAIN) method to estimate irrigation water use in the Heihe River Basin from 2003 to 2020 using thermal infrared and microwave satellite data. The results showed that this approach has satisfactory performance in estimating the annual irrigation water volume (mean volume=0.657 km3/year, R2=0.83, RMSE=0.03 km3/year) when compared with the field measurements at irrigation district administrative scale, due to its reliability in determining the infiltrated water around the root zone used by crops. New hydrological insights for the region: Through an analysis of irrigation water use trends, the results indicate that most farmland areas exhibited a declining trend in water use per hectare (-55 m3/ha/yr). Interestingly, we observed that while water use efficiency improved significantly at the field scale, overall irrigation efficiency showed a decreasing trend. This study reveals a paradox in the Heihe River Basin, where enhanced irrigation efficiency rarely translates into reduced total water consumption at river basin scale. Our study advances agricultural irrigation volume estimation and irrigation mapping across district and river basin scales in arid and semiarid areas, which should assist in irrigation scheduling and water resource management.

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