应用地表温度与植被指数梯形空间关系估算陆面蒸散量

被引：4

作者：

王文

王晓刚

黄对

雍斌

机构：

[1] 河海大学水文水资源与水利工程科学国家重点实验室

来源：

农业工程学报 | 2013年 / 29卷 / 12期

基金：

国家自然科学基金重大项目;

关键词：

蒸散; 遥感; 温度; 植被指数; 梯形关系; Priestley-Taylor系数; MODIS;

D O I：

暂无

中图分类号：

P333.1 [水量平衡];

学科分类号：

081501 ;

摘要：

提出了以Priestley-Taylor方程为基础,综合利用地面气象观测数据与卫星遥感观测数据的陆面蒸散量估算方法。其基本思路是:基于地表能量平衡原理,利用遥感观测与地面气象观测数据,计算给定气温条件下全植被覆盖与祼土地面在极湿、极干状况下的地表温度,构建每个像元的地表温度(Ts)与植被指数(VI)的理论梯形空间,进而根据该象元Ts-VI坐标点在该梯形中的位置,计算其Priestley-Taylor系数,并利用Priestley-Taylor方程估算像元的蒸散比。利用美国一个半干旱地区的地面观测数据进行了精度验证,结果表明该方法具有较理想的精度,蒸散量估算的平均绝对误差约为35.5%。

引用

页码：101 / 109

页数：9

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