一种简化蒸散发遥感反演模型及其在灌区的应用  

A Simplified ET Mapping Algorithm and Its Application in Irrigation District

作　　者：蔡学良 崔远来[2] 

机构地区：[1]International Water Management Institute,Colombo,Sri Lanka.PO BOX 20075 [2]武汉大学水文水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《灌溉排水学报》2009年第2期51-54,共4页Journal of Irrigation and Drainage

基　　金：国家自然科学基金项目(50579059,50879060,50839002);教育部博士点基金项目(20050486002);国家科技支撑计划项目(2006BAD11B08)

摘　　要：提出简化的地表能量平衡模型(SSEB)将站点作物蒸散发量递推到整个灌区。首先由气象观测资料计算作物潜在蒸散发量,结合Landsat ETM+60 m热红外波段反演的地表温度差异把站点单日ET扩展到灌区,再融合ETM+和MODIS 1 km热红外时间系列数据,进一步提取全年灌区尺度蒸散发分布图。用湖北漳河灌区2000年的影像资料,将SSEB与SEBAL模型计算结果进行对比,结果表明,二者的决定系数R2达到了0.89。漳河灌区蒸散发主要来源于二、三干渠,年总蒸散发量中,作物蒸发蒸腾占67%,林地蒸散发占17%,水面加上裸地等其它用地的无效蒸散发占16%。This paper introduces a remote sensing approach to extrapolate in situ reference ET to larger spatial domain using simplified surface energy balance （SSEB） algorithm. Crop potential ET was calculated and then extrapolated to whole irrigation district according to the land surface temperature differences derived from two Landsat ETM＋ images. These results were further extended to whole year based on time series MODIS data. The comparison showed very high correlation （R^2= 0. 89） between ET from SSEB and surface energy balance algorithm for land （SEBAL）. ET in Zhanghe irrigation district was mainly from 2nd and 3rd main canal with significant contribution from local storage command area. Crop ET （67%） is the sole largest consumer of annual ET, seconded by forest （17%）. However, non-beneficial ET from open water bodies and fallow land also accounts up to 16%.

关 键 词：灌区 蒸散发 遥感 SSEB 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]