摘要
以锡林河流域为研究区，利用遥感对合成的MODIS影像数据进行处理，结合同期气象资料估算出流域H蒸散量。结果表明，反演得到的日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，其中低湿地植被、草甸草原蒸散量较大，锡林河流经区域的地段形成的湿地植被日蒸散量较大，植被密集的地方如耕地蒸散值较大，明显高于植被稀疏的地区。日蒸散量分布曲线基本为正态分布，主值区间为2～7mm／d，流域平均蒸散量为4．51mm／d。运用FA0推荐式进行了验证，误差在允许范围之内，说明该遥感方法具有一定的适用性。
The study area is the Xilin River watershed. Remote sensing approach was used to retrieve instanta- neous evapotranspiration based on the estimation of land surface fluxes from MODIS image in 2012, and the auxiliary environmental data from the same time periods. Daily evapotranspiration was estimated by scaling. The result of evapotranspiration distribution was consistent with land surface conditions. The daily evapo- transpiration in the upper reaches was higher than in the middle and lower reaches. The daily evapotranspira- tion of wetland vegetation and meadow grassland was higher. The daily evapotranspiration of dense vegeta- tion such as farmland was higher than the sparse one. The distribution curve of daily evapotranspiration was characterized as Gaussian distribution. The main value was between 2 and 7 mm/d and the average value was 4.51 m/d. Results were verified by using the FAO method. This level of uncertainty was acceptable; there- fore, the method that we developed was applicable.
出处
《水土保持研究》
CSCD
北大核心
2014年第1期224-228,共5页
Research of Soil and Water Conservation
基金
水利部公益性行业科研专项经费项目(201001039)
内蒙古自然科学基金项目(2013MS0611)
关键词
锡林河流域
蒸散量
遥感
Xilin River watershed
evapotranspiration
remote sensing
