利用Penman-Monteith-Leuning模型和Sentinel-2数据的灌区蒸散发反演  

Inversion of Evapotranspiration in Irrigation Area Using Penman-Monteith-Leuning Model and Sentinel-2 Data

作　　者：徐浩玮 段浩[1,2] 赵红莉 郝震[1,2] 樊玉苗 XU Haowei;DUAN Hao;ZHAO Hongli;HAO Zhen;FAN Yumiao(China Institute of Water Resources and Hydropower Research,Beijing 100048,China;Key Laboratory of Digital Twin Basin,Ministry of Water Resources,Beijing 100048,China;Yellow River Institute of Hydraulic Research,Zhengzhou 450003,China)

机构地区：[1]中国水利水电科学研究院,北京100048 [2]水利部数字孪生流域重点实验室,北京100048 [3]黄河水利科学研究院,郑州450003

出　　处：《遥感信息》2023年第2期79-86,共8页Remote Sensing Information

基　　金：国家重点研发计划项目(2021YFB3900602);中国工程科技知识中心项目(CKCEST-2022-1-35)。

摘　　要：针对目前基于Penman-Monteith-Leuning模型(PML)的蒸散发模拟研究中,存在因多种地表参数的时空尺度差异导致蒸散发反演误差这一问题,提出了一种耦合土壤含水量改进模型土壤蒸发系数f的参数化方案。通过Sentinel-2影像反演土壤含水量、LAI等模型关键参数,并基于土壤含水量计算f,在河套灌区建设二分干灌域开展蒸散发反演,结合地面观测数据进行验证。结果表明:模型反演结果与涡动相关站实测数据有较好的一致性;在植被覆盖度较低时,改进的f参数化方案能更好地反映土壤蒸发的实际情况;该反演结果较为准确地反映了不同下垫面的蒸散发空间异质性。文章对蒸散发反演方法和数据的尝试,可为高分辨率蒸散发反演方法提供参考,并为干旱区和半干旱区的农业用水管理提供技术支持。In order to solve the problem of error in evapotranspiration inversion results caused by the spatial and temporal scale differences of various surface parameters in the current study of evapotranspiration simulation based on Penman-Monteith-Leuning model(PML),a parameterization scheme for coupling soil moisture to improve the soil evaporation coefficient f of the model is proposed.In this study,the Sentinel-2 image is used to retrieve the key parameters of the model,such as soil water content and LAI,and the soil water content is used to calculate the parameter f.The evapotranspiration inversion is carried out in the second main canal’s irrigation area of Jianshe Canal in Hetao irrigation area,and is verified with the ground observation data.The results show that:the model simulation results are in good agreement with the measured data of eddy correlation station;when the vegetation coverage is low,the improved f parameterization scheme can better reflect the actual situation of soil evaporation;the evapotranspiration results obtained by this method accurately reflect the spatial heterogeneity of evapotranspiration caused by different underlying surfaces.The attempt of evapotranspiration inversion method and data in this paper can provide reference for high resolution evapotranspiration inversion method,and provide technical support for agricultural water management in arid and semi-arid areas.

关 键 词：蒸散发 Sentinel-2 Penman-Monteith-Leuning模型 土壤蒸发 河套灌区 

分 类 号：TV11[水利工程—水文学及水资源]