TSEB模型在复杂下垫面下模拟结果比较研究  

Comparative Study of Simulation Results of TSEB Model under Various Landcovers and Environment Conditions

作　　者：徐艳豪 丁忠昊 宋立生 Xu Yanhao;Ding Zhonghao;Song Lisheng(School of Geographical Sciences,Southwest University,Chongqing 400715,China)

机构地区：[1]西南大学地理科学学院,重庆400715

出　　处：《遥感技术与应用》2022年第1期85-93,共9页Remote Sensing Technology and Application

基　　金：国家自然科学基金项目“耦合土壤水分的土壤蒸发和植被蒸腾遥感估算与验证研究”(42071298)、“流域尺度土壤蒸发和植被蒸腾遥感估算与验证研究”(41701377)。

摘　　要：地表蒸散发对干旱半干旱地区水文过程模拟以及水文平衡有重要影响,复杂地表更是对地表蒸散发模拟提出了新的挑战。利用TSEB(Two-Source Energy Balance)模型,分别以Landsat、MODIS卫星数据为驱动数据,得到黑河下游绿洲地表蒸散发时空分布格局,并利用大孔径闪烁仪和涡动相关仪的观测数据对模拟结果分别在公里级和百米级尺度进行验证,研究结果表明:在大孔径闪烁仪观测的公里级尺度下,基于Landsat数据和MODIS数据驱动的TSEB估算感热通量与大孔径闪烁仪观测数据比较的均方根误差分别为48.47 W/m^(2)、58.57 W/m^(2)。基于涡动相关仪观测百米级尺度,Landsat数据驱动的TSEB估算感热通量与涡动相关仪观测数据的均方根误差为89.37 W/m^(2)。因此,得出以中高分辨率卫星遥感数据作为驱动数据模型模拟效果更好,LAS观测公里级尺度数据能部分解决遥感地表蒸散发验证空间不匹配问题。Land surface evapotranspiration has an important impact on the simulation of earth’s hydrological processes and hydrological balance,especially in the arid and semi-arid regions.Where the heterogeneous land surface conditions pose new challenges to the simulation of evapotranspiration using the remote sensing models.In this paper,the satellite data collected from Landsat and MODIS were used as driving data of TSEB model,respectively,to obtain the temporal and spatial distribution pattern of land surface evapotranspiration in the downstream of the Heihe watershed.Then the surface heat fluxes measured by the large aperture scintillator with a source area of several kilometers and the eddy covariance with a source area of several hundred meters were used to evaluate the model outputs at the multiple spatial scales.The results showed that the TSEB estimated surface sensible heat flux using Landsat and MODIS data is comparable with the observations from the large aperture scintillator,with Root Mean Square Error(RMSE)values of 48.47 W/m^(2) and 58.57W/m^(2),respectively.While comparing with the observation of eddy covariance,the Landsat data-driven TSEB estimates produced RMSE value of 89.37W/m^(2).Therefore,it can conclude that the TSEB model has a better agreement with ground measurements when using the finer satellite remote sensing data as model inputs.In addition,large aperture scintillator observation with a source area of several kilometers can partially solve the spatial mismatch issues between the remote sensing products and the ground measurements.

关 键 词：蒸散发 TSEB模型 Landsat和MODIS遥感数据 真实性检验 

分 类 号：P426[天文地球—大气科学及气象学] P407