Towards an improved mapping of evapotranspiration in semi-arid regions

被引：0

作者：

Gokmen, Mustafa ^{[1
]}

van der Tol, Christiaan ^{[1
]}

Vekerdy, Zoltan ^{[1
]}

Verhoef, Wouter ^{[1
]}

Batelaan, Okke ^{[2
,3
]}

Sarikaya, Hasan Z. ^{[4
]}

机构：

[1] Univ Twente, Dept Water Resources, Fac Geoinformat Sci & Earth Observat ITC, NL-7500 AE Enschede, Netherlands

[2] Vrije Univ Brussels, Dept Hydrol & Hydraul Engn, B-1050 Elsene, Belgium

[3] Katholieke Univ Leuven, Dept Earth & Environm Sci, B-3000 Louvain, Belgium

[4] Minist Environm & Forestry Turkey, Ankara, Turkey

来源：

REMOTE SENSING AND HYDROLOGY | 2012年 / 352卷

关键词：

evapotranspiration; evaporative fraction; Bowen ratio; remote sensing; SEBS; soil moisture; EVAPORATIVE FRACTION; TEMPERATURE;

D O I：

暂无

中图分类号：

TP7 [遥感技术];

学科分类号：

081102 ; 0816 ; 081602 ; 083002 ; 1404 ;

摘要：

In drylands, evapotranspiration is mainly limited by soil moisture, but current surface energy balance models do not directly make use of this fact. We tested the single-source energy balance model SEBS in a semi-arid region and showed that SEBS is significantly overestimating the evaporative fraction for sparsely vegetated drylands. As an alternative for such conditions, we derived an empirical function of soil moisture, temperature gradient and NDVI, which performed significantly better. This was then integrated with the evaporative fraction output of SEBS for an improved mapping of evapotranspiration in a semi-arid region. Ground measurements of the evaporative fraction from five Bowen ratio energy balance systems were used first to test SEBS and then to calibrate the empirical equation. The resulting method uses remote sensing data and in situ air temperature measurement.

引用

页码：149 / 153

页数：5

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