Abstract
Numerous methods and techniques are used in the hydrological modeling and the estimation of runoff , evapotranspiration and infiltration . Each model uses specific parameters as inputs for the analysis . Due to the great spatial and temporal variability of watershed characteristics , precipitation patterns and the number of variables involved in the physical process , the relation of rainfall-runoff , evapotranspiration and infiltration is one of the most complex hydrologic phenomena . The main objective of the present study is to study the relation of rainfall – runoff , evapotranspiration and infiltration using remote sensing and GIS techniques based on land use/land cover , soil types and basin parameters computed from the digital elevation model of Shuttle Radar Topographic Mission (SRTM) data . Runoff is estimated using Soil Conservation Service (SCS) – Curve Number (CN) losses method with Hydrologic Engineering Center (HEC-1) model in WMS package . This technique was employed to simulate the characteristics of surface runoff i.e. runoff volume , peak flow , time of peak flow for different sub watersheds and outlets for three storm events of rainfall belong to three different antecedent moisture conditions (AMC),. The evapotranspiration , calculated by Surface Energy Balance Algorithm for Land (SEBAL) method using Landsat-7 ETM+ imagery . Depending upon the rainfall , runoff and evaptranspiration the rainfall- infiltration coefficients calculated for each sub basins . The results shows the effect of soil types , land use/land cover , vegetation densities and basin morphometric parameters on the spatial distribution of the surface runoff , evapotranspiration and the recharge of the ground water in the sub basins of Kandukuru Vagu basin .
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* Dept.of Geography , Education College , al-Mustansiriyah University ,Baghdad ,Iraq (presently working for Ph.D programme in the department of Geology OU , under ICCR exchange programme)
Key words : Kandukuru Vagu basin , SEBAL , GIS , Remote Sensing , watershed , runoff , evapotranspiration , infiltration . groundwater , SCS , Curve Number , HEC-1 .
Ayad Ali Faris * , Y.Sudhakar Reddy
Dept. of Geology , University College of Science , Osmania University
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