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Assessment of the Relationship Between NDVI-Based Actual Evapotranspiration by SEBS
Iranian Journal of Science and Technology, Transactions A: Science ( IF 1.7 ) Pub Date : 2020-06-07 , DOI: 10.1007/s40995-020-00895-3 Mina Arast , Abolfazl Ranjbar , Seyed Hojat Mousavi , Khodayar Abdollahi
Iranian Journal of Science and Technology, Transactions A: Science ( IF 1.7 ) Pub Date : 2020-06-07 , DOI: 10.1007/s40995-020-00895-3 Mina Arast , Abolfazl Ranjbar , Seyed Hojat Mousavi , Khodayar Abdollahi
Groundwater has emerged to be a formidable poverty reduction tool in many developing countries because it can be distributed to poor communities far more cheaply, quickly and easily. This study investigated the applicability of seasonal actual evapotranspiration (\({\mathrm{ET}}_{\mathrm{a}}\)) in modeling trends in water table depth level and vegetation cover using in the Zayanderud basin, Iran. To this end, the surface energy balance system (SEBS) algorithm was applied to estimate the changes in \({\mathrm{ET}}_{\mathrm{a}}\). By this approach, atmospherically corrected moderate-resolution imaging spectroradiometer products from 2000 to 2017 were used to determine the sensitivity of SEBS, physiological characteristics, and environmental factors. We found that the variations in the actual evapotranspiration estimated by SEBS (SEBS \({\mathrm{ET}}_{\mathrm{a}}\)) are mostly influenced by meteorological factors, net radiation, land cover type, NDVI, and water table depth. The SEBS \({\mathrm{ET}}_{\mathrm{a}}\) in the western part of the basin showed a higher value than that in the eastern part. The annual \({\mathrm{ET}}_{\mathrm{a}}\) has temporally increased from 45.66 to 112.34 mm in the eastern area of the basin and 97.64 mm in the western areas. Also, SEBS \({\mathrm{ET}}_{\mathrm{a}}\) was evaluated in the western and eastern parts of the study site comparatively, but there was not a significant difference between evaporation and SEBS \({\mathrm{ET}}_{\mathrm{a}}\) of the two sides. The correlation of NDVI and groundwater levels with SEBS \({\mathrm{ET}}_{\mathrm{a}}\) was relatively stronger in wet seasons than in dry seasons. This difference may be attributed to a water availability mechanism according to which as the depth of groundwater raises, NDVI decreases, while SEBS \({\mathrm{ET}}_{\mathrm{a}}\) increases. Therefore, this study contributes to our enhanced understanding of the planning and management of groundwater over arid and semi arid ecosystem.
更新日期：2020-06-07
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