【作者】 于红博； 包玉海； 张巧凤； 李和平； 王军；

【Author】 YU Hong-bo;Bao Yu-hai;Zhang Qiao-feng;Li He-ping;Wang Jun;Inner Mongolian Key Laboratory of Remote Sensing and Geography Information System,Inner Mongolia Normal University;College of Geograghy Science,Inner Mongolia Normal University;Institute of Water Resources for Pastoral Area,IWHR;

【机构】 内蒙古师范大学遥感与地理信息系统重点实验室； 内蒙古师范大学地理科学学院； 中国水利水电科学研究院牧区水利科学研究所；

【摘要】 本研究选择锡林河流域为研究区,基于地表能量平衡原理,利用遥感方法对2007年(枯水年)、2010年(平水年)和2012年(丰水年)4-9月的MODIS影像数据进行处理,结合同期气象资料估算出流域日蒸散量,按所占日数加权得到月蒸散量。运用FA0推荐式进行了验证,平均相对误差为16.678%,在误差允许范围之内,说明该遥感方法有一定的可用性。结果表明,反演得到的蒸散量分布与地表状况比较吻合,上游地区日蒸散量高于中下游地区,丰水年生长季的蒸散量明显高于平、枯年份生长季的蒸散量。不同土地利用类型蒸散量的排列基本为林地>耕地>未利用地>城镇居民生活用地>草地。更多还原

【Abstract】 Our study area is the Xilin River basin.Remote sensing approach was used to retrieve instantaneous evapotranspiration based on the estimation of land surface fluxes by using MODIS images from Apr.to Sept.of 2007,2010 and 2012,and using auxiliary environmental data from the same time periods.Daily evapotranspiration was estimated by scaling.Monthly evapotranspiration were weighted by the number of days.Results were verified by using the FAO method.This level of uncertainty was acceptable;therefore,the method that we concluded was applicable.The result of evapotranspiration distribution was consistent with land surface conditions.The evapotranspiration in the upper reaches was always higher than in the middle and lower reaches.The evapotranspiration value was higher in wet year than in average year and dry year.The order of evapotranspiration value of different land use type is basically:forest land>farmland>unutilized land>construction land>grassland.更多还原