Designing Mapping tool for Reference Evapotranspiration Spatial Distribution in Syrian Coast Using GIS
Keywords:
Reference Evapotranspiration; Blaney – Criddle Formula; Spatial AnalysisAbstract
Most hydrological calculations require an accurate estimate of evaporation and evapotranspiration values, especially those relating to water resource management, and water balance calculations at the regional level. For these purposes, several methods and equations have been proposed and developed to calculate and estimate the values of evaporation and reference (ET0), which have varied from experimental simple equations to complex equations based on physical processes, accompanying both evaporation and the affecting on it factors.
A number of software tools are designed to estimate evaporation values in targeted locations, but all of these tools are point-based, so they compute the evaporation value at a specific location (often the location of the climate station), based on the climatic input or data of the site. In this research, a software tool was designed within ArcGIS platform to calculate evapotranspiration values, and to map them in the Syrian coastal basin, from climate data, using spatial analysis methods and spatial mathematical extrapolation as basic tools in GIS. The tool designed was based on the Blaney-Criddle empirical equation.
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