Monitoring Evapotranspiration for Terrestrial Groundwater Dependant Ecosystems Using Satellite-Based Energy Balance Model (original) (raw)

Abstract

Understanding and mitigating against the impact of land use change and groundwater extraction on groundwater dependant ecosystems (GDE) requires information on the distribution and environmental water needs of these ecosystems. Conventional field based techniques for determining plant water use and plant stress are very labour intensive and time consuming. In this study, we proposed an alternative method using multi-temporal satellite images and the application of the Surface Energy Balance Algorithm for Land (SEBAL). Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper (ETM+) images were used to derive land surface temperatures and evapotranspiration (ET) for the targeting ecosystems and species. The radiative transfer model (MODTRAN 4.1) was used with atmospheric profile data to atmospherically correct the Landsat data. Vegetation indices and surface temperature were derived from the satellite images and used to estimate fractional vegetation cover, leaf area index (LAI), emi...

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