典型草原地区蒸散发研究与分析  

Research for Evapotranspiration of the Typical Grassland

作　　者：王军[1] 李和平[1] 鹿海员[1] 贾金良 

机构地区：[1]水利部牧区水利科学研究所,呼和浩特010020 [2]鄂尔多斯市水利工程局,内蒙古鄂尔多斯017000

出　　处：《水土保持研究》2013年第2期69-72,315,共4页Research of Soil and Water Conservation

基　　金：水利部公益性行业科研专项"牧区灌溉人工草地高效用水技术研究"(201001039)

摘　　要：蒸散发(ET)作为影响水资源空间分布的关键因素之一,准确监测、模拟其值的空间变化,对提高水资源利用效率和保护区域生态环境具有重要意义。选择北方典型草原区锡林河流域作为研究对象,通过气象数据和TM数据,利用遥感和GIS技术,构建了锡林河流域反演蒸散发的SEBAL模型。结果显示,卫星过境当天流域蒸散发为0～9.1mm/d,其中蒸散发在0～2mm/d之间的像元占流域总面积的70%以上,地表水资源不足是导致蒸散发较小的主要原因;按照土地利用类型统计,水域分布的地区日蒸散发相对较高,草地分布的地区日蒸散发相对较低;相关性分析显示,地表温度的大小变化对ET空间分布影响较大。反演结果对流域尺度的水资源管理定量化研究具有重要意义,同时,可为深入研究"水—草—畜"系统平衡奠定理论基础。As the key factor affected uneven regional distribution of water resources, ET values estimated or simulated accurately are of the great significance for many fields, such as raising water resource use efficiency and its temporal and protecting ecological environment. Xilin River basin was selected as the case study that is typical grassland in China, sorted out TM data and meteorology data, and built the SEBAL model to calculate ET by remote sensing technology and GIS. The results showed that evapotranspiration of the basin ranged from 0 to 9.1 mm daily, but evapotranspiration of the 70% areas of the basin merely alternated between 0 and 2 mm daily. The result also showed that the ET24 of water areas was relatively higher and the ET24 of grassland was relatively lower, what＇s more, the change of surface temperature had greater influence on ET from the result of correlation analysis. The model inversion results have greater significance on the quantification of water resources management and establishment of the theory foundation to study the water- glass livestock system balance.

关 键 词：蒸散发 SEBAL模型 相关性分析 锡林河流域 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]