Performance of the METRIC model in estimating evapotranspiration fluxes over an irrigated field in Saudi Arabia using Landsat-8 images

被引：45

作者：

Madugundu, Rangaswamy ^{[1
]}

Al-Gaadi, Khalid A. ^{[1
,2
]}

Tola, ElKamil ^{[1
]}

Hassaballa, Abdalhaleem A. ^{[1
]}

Patil, Virupakshagouda C. ^{[1
]}

机构：

[1] King Saud Univ, Precis Agr Res Chair, Riyadh 11451, Saudi Arabia

[2] King Saud Univ, Coll Food & Agr Sci, Dept Agr Engn, Riyadh 11451, Saudi Arabia

来源：

HYDROLOGY AND EARTH SYSTEM SCIENCES | 2017年 / 21卷 / 12期

关键词：

AGRICULTURAL WATER PRODUCTIVITY; SENSIBLE HEAT-FLUX; ENERGY-BALANCE; MAPPING EVAPOTRANSPIRATION; SEBAL MODEL; SOIL; TEMPERATURE; SATELLITE; SCALE; CROP;

D O I：

10.5194/hess-21-6135-2017

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Accurate estimation of evapotranspiration (ET) is essential for hydrological modeling and efficient crop water management in hyper-arid climates. In this study, we applied the METRIC algorithm on Landsat-8 images, acquired from June to October 2013, for the mapping of ET of a 50 ha center-pivot irrigated alfalfa field in the eastern region of Saudi Arabia. The METRIC-estimated energy balance components and ET were evaluated against the data provided by an eddy covariance (EC) flux tower installed in the field. Results indicated that the METRIC algorithm provided accurate ET estimates over the study area, with RMSE values of 0.13 and 4.15 mm d(-1). The METRIC algorithm was observed to perform better in full canopy conditions compared to partial canopy conditions. On average, the METRIC algorithm overestimated the hourly ET by 6.6% in comparison to the EC measurements; however, the daily ET was underestimated by 4.2 %.

引用

页码：6135 / 6151

页数：17

共 81 条

[21] Radiometric surface temperature calibration effects on satellite based evapotranspiration estimation [J].