基于SEBAL模型的河套灌区永济灌域蒸散发估算及其变化特征  

Estimation of Evapotranspiration and Its Variation Characteristics in Yongji Irrigation Area of Hetao Irrigation District Based on SEBAL Model

作　　者：李彦彬[1] 梁坤 张文鸽[2] LI Yanbin;LIANG Kun;ZHANG Wen ge(North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Yellow River Institute of Hydraulic Research,Zhengzhou 450003,China)

机构地区：[1]华北水利水电大学,河南郑州450046 [2]黄河水利科学研究院,河南郑州450003

出　　处：《人民珠江》2023年第11期61-69,共9页Pearl River

基　　金：国家自然科学基金面上项目(51979119)。

摘　　要：蒸散发是水文循环和能量循环中的关键环节,蒸散发的准确估算对农业用水调度和水资源的管理至关重要。为探索基于遥感技术建立快捷估算区域蒸散发的方法,选取河套灌区永济灌域为研究区,利用Landsat遥感影像和土地利用分类结果,基于SEBAL模型,对永济灌域2019年生长季的日蒸散量进行估算,分析研究区蒸散发时空变化特征以及不同土地类型蒸散发的差异。结果表明:①SEBAL模型估算结果与FAO P-M公式相比,决定系数R 2为0.94,均方根误差RMSE为0.43 mm/d,相对误差MRE为8.62%,模型反演精度较高,可以为研究区提供合理的蒸散发估算;②永济灌域生长季内日均蒸散量呈单峰变化趋势,最大值为7月的4.56 mm/d,最小值为10月的1.87 mm/d,并存在明显的空间分布差异;③不同土地利用类型的日蒸散量大小依次为:水体>耕地>城乡用地>草地>荒地。基于SEBAL模型估算区域的蒸散量,可为灌区水资源的节约利用提供参考。Evapotranspiration(ET)is a key link in the hydrological cycle and energy cycle,and accurate estimation of ET is crucial for agricultural water use scheduling and water resources management.In order to establish a quick estimation method of regional ET based on remote sensing technology,this paper selected the Yongji Irrigation Area of the Hetao Irrigation District as the study area.By using Landsat remote sensing images and land use classification results,a SEBAL model was constructed to estimate the daily ET for the 2019 growing season in the Yongji Irrigation Area.Then,the spatial and temporal variation characteristics of ET in the study area and the differences of ET in different land types were analyzed.The results indicate that:①Compared with the FAO P-M formula,SEBAL model estimation results yield a determination coefficient R 2 of 0.94;the root-mean-square error(RMSE)is 0.43 mm/d,and the relative error(MRE)is 8.62%.The inversion accuracy of the model is higher,which can provide a reasonable ET estimation for the study area.②The average daily ET in the Yongji Irrigation Area shows an unimodal trend during the growing season,with a maximum value of 4.56 mm/d in July and a minimum value of 1.87 mm/d in October,and there are obvious differences in spatial distribution.③The daily ET of different land use types is as follows:water bodies>arable land>urban and rural land>grassland>wasteland.Overall,the estimation of regional ET based on the SEBAL model can provide a reference for the economical utilization of water resources in irrigation areas.

关 键 词：蒸散发 SEBAL模型 土地利用 永济灌域 

分 类 号：S274[农业科学—农业水土工程]