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Estimation of the Actual Evapotranspiration by the sebal Method in the Irrigated Rice Perimeter of Zatta (Yamoussoukro—Côte d’Ivoire)

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Journal of Water Resource and Protection 2023年第10期15卷 539-556页

作者： Junias Léandre Kra Moïse Botou Adahi Brice Arthur Konan-Waidhet Jean-Yves Konan N’Guessan Joël Doyéré Koné Emmanuel Nogbou Assidjo Department of Geosciences and Environment Université Jean Lorougnon Guédé (UJLoG) Daloa C&ocircte d’Ivoire Department of Rural Engineering and Geographical Sciences Institut National Polytechnique Félix Houphou&eumlt-Boigny (INP-HB) Yamoussoukro C&ocircte d’Ivoire Department of Chemical and Food Engineering Institut National Polytechnique Félix Houphou&eumlt-Boigny (INP-HB) Yamoussoukro C&ocircte d’Ivoire

In this study, the sebal (Surface Energy Balance Algorithm for Land) model was used to map the spatio-temporal distribution of actual evapotranspiration in the Yamoussoukro department (Côte d’Ivoire). Like other regions of the country, the Yamoussoukro district is confronted with the phenomenon of evapotranspiration (ET). This is a very important component that comes into play in the water balance but also in the calculation of the water needs of agricultural crops. Consequently, its estimation is of paramount importance in research related to the rational management of water resources, particularly agricultural water. The objective of this study was to analyze the spatio-temporal distribution of actual evapotranspiration (AET) as a function of land cover and land use. The methodology used is based on the sebal model which uses remote sensing (Landsat 8_OLI/TIRS) and climatic data to estimate actual evapotranspiration and analyze the spatio-temporal distribution of AET. The results reveal that the AET varied from 0 to 5.44 mm/day over the period from December 2019 to February 2020 with an average value of 4.92 mm/day. The highest average values occurred for water bodies (4.90 mm/day) and flooded vegetation (4.88 mm/day) while the lowest values occurred in residential areas (2.04 mm/day). Furthermore, the results show that the difference between the sebal model and the FAO-Penman-Monteith method is minimal with an average RMSE of 0.36 mm/day for all the satellite images. This study demonstrates the considerable potential of remote sensing for the characterization and estimation of spatial evapotranspiration in the Zatta irrigated rice-growing area.

关键词： Evapotranspiration Water Balance Rational Management Remote Sensing sebal model

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Simplified sebal method for estimating vast areal evapotranspiration with MODIS data

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Water Science and Engineering 2011年第1期4卷 24-35页

作者： Xiao-chun ZHANG Jing-wei WU Hua-yi WU Yong LI State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan 430079 P. R. China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan 430070 R R. China School of Earth Sciences and Engineering Hohai University Nanjing 210098 R R. China

The sebal （surface energy balance algorithm for land） model provides an efficient tool for estimating the spatial distribution of evapotranspiration, and performs a simple adjustment procedure to calculate sensible heat flux using the wind speed data set from only one weather station. This paper proposes a simplified method to modify the traditional sebal model for calculating the 24-hour evapotranspiration （ ETduly ） in the Haihe Basin with data from 34 weather stations. We interpolated the wind speeds using the inverse distance weighting method to establish a wind field and then used it to calculate the friction velocity directly. This process also simplifies the iterative computation process of sensible heat flux. To validate the feasibility of this simplified method, we compared the results with those obtained with an appropriate but more complex method proposed by Tasumi, which separates a vast area into several sub-areas based on the weather conditions, and runs the sebal model separately in each sub-area. The results show good agreement between the evapotranspiration generated by the two methods, with a coefficient of determination （r2） of 0.966, which indicates the feasibility of estimating evapotranspiration over a large region with the simplified method.

关键词： evapotranspiration sebal model MOD1S, remote sensing sensible heat flux Haihe Basin

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