Estimation of Regional Evapotranspiration Based on the Decouple Model and Remote Sensing Information --a Case Study in Beijing City and Nearby Region

文献类型： 外文期刊

第一作者： Di, Su-Chuang

作者： Di, Su-Chuang;Zheng, Fan-Dong;Li, Xue-Min;Qi, Yan-Bing;Liu, Hong-Lu;Di, Su-Chuang;Zheng, Fan-Dong;Li, Xue-Min;Qi, Yan-Bing;Liu, Hong-Lu;Li, Zhao-Liang;Jiang, Ya-Zhen;Tang, Ronglin;Li, Zhao-Liang;Liu, Meng;Li, Zhao-Liang;Ren, Yanmin;Li, Zhao-Liang

作者机构： Beijing Water Sci & Technol Inst, Big Data Anal & Applicat Res Dept, Beijing, Peoples R China;Bejing Engn Res Ctr Nonconvent Water Resources Uti, Urban Rainwater & Flood Utilizat Res Dept, Beijing, Peoples R China;Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing, Peoples R China;Chinese Acad Agr Sci, Minist Agr, Key Lab Agriinformat, Inst Agr Resources & Reg Planning, Beijing, Peoples R China;CNRS, ICube, UdS, Illkirch Graffenstaden, France;Beijing Acad Agr & Forestry Sci, Res Ctr Informat Technol, Beijing, Peoples R China;Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China

关键词： Evapotranspiration (ET); decouple model; surface resistance; water consumption

期刊名称：INTERNATIONAL JOURNAL OF REMOTE SENSING （ 2022影响因子：3.4； 五年影响因子：3.6 ）

ISSN： 0143-1161

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Evapotranspiration (ET) is an important component of surface energy balance and a key process of hydrological cycle. Continuous and accurate estimation of regional ET is meaningful for water management, agricultural production, and climate change adaptation. Remote sensing (RS) technique is of important meaning for estimating ET on regional scale. In this study, a new method is developed to integrate the RS information and meteorological data based on the decouple model which is deduced from Penman-Monteith (PM) model. Firstly, a parameterization method for decoupling factor (omega) which is key parameter in the decouple model and could reflect the coupling relationship between the land surface and atmosphere systems is introduced. Subsequently, the decouple model is applied to inverse regional ET in Beijing City and nearby region, from 1st, May, 2013 to 31th, October, 2020. Thirdly, the inversed daily ET values are evaluated based on the measured data at Huailai station and in Badaling Forest Farm. The results show that the changing trend of estimated ET and measured ET are basically the similar. The bias value is -0.12 mm d-1, the RSME value is 0.66 mm d-1, and the correlation coefficient is 0.52. Finally, the spatiotemporal trend of water consumption in study area is analysed based on the ET estimation results. The month with the largest water consumption in 2013 is July with the quantity of 0.92 billion m3, accounting for about 22% of the regional total water consumption in growing season. The regions with high ET values agree well with the regions of high soil moisture and high air humidity as well as high biomass. These results suggest that the decouple model is with great potential to generate regional daily ET products and to support irrigation management.

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