分布式水文模型结合遥感研究地表蒸散发  

Simulation of Land Surface Evapotraspiration Using Distributed Hydrological Model,Remote Sensing and GIS Technology

作　　者：刘三超[1] 张万昌[2] 高懋芳[2] 柳钦火[1] 

机构地区：[1]中国科学院遥感应用研究所遥感科学国家重点实验室,北京100101 [2]南京大学国际地球系统科学研究所,江苏南京210093

出　　处：《地理科学》2007年第3期354-358,共5页Scientia Geographica Sinica

基　　金：国家重点基础研究发展规划项目(G2000077900);国家重点基础研究发展规划项目(2001CB309404)资助

摘　　要：地表蒸散发是研究土壤-植被-大气系统水热平衡的关键因子。用改进的DHSVM分布式水文模型对汉江上游子午河流域蒸散发进行模拟。根据流域特点,主要进行TM遥感数据的大气校正和几何校正,在此基础上得到叶面积指数和土地覆盖等地表参数;再利用G IS技术基于DEM求出坡度、坡向和地形指数等因子。分析了蒸散发时空分布特征,表明日尺度蒸散发空间分布差异较大。初步验证了结果,表明模型在中国典型湿润区小流域取得较好效果。Evapotranspiration （ET） is the key factor to the research on water circulation and heat balance in the soil-vegetation-atmosphere system. In this article, a pixel based adapted DHSVM distributed hydrological model that integrates remote sensing and geographic information system was applied in the Ziwuhe River watershed in the upper Hanjiang River basin. The modeled pixel is 60 m large. Our study focused on the atmospheric and topographic correction on optical remote sensing data and utilizing 30 m resolution Landsat TM data to obtain leaf area index and the land use and land cover data. Some useful terrain factors as slope and aspect and topographic index could also be derived from digital elevation model. The results showed that the spatial pattern of ET was similarity in different temporal scales, moreover, it was found that daily ET spatial differences were more evident. The result also showed that the distributed model could be used in small basin of humid climate.

关 键 词：蒸散发 分布式水文模型 遥感 DEM 

分 类 号：P426.2[天文地球—大气科学及气象学]