Event-based Rainfall-runoff Simulations using GETFLOWS for Kourtimalei Catchment in Djibouti

Abstract

This work was focused on the simulation of a surface terrestrial water flow process model in the area of Kourtimalei in Djibouti using GIS, RS and GETFLOWS, a physics-based surface and subsurface fully coupled fluids flow code. A trial and error were used to calibrate the model using observed surface water level of the pond. The manual calibration was performed until the surface water level of the pond RMSE to be 0.40 m with K>0.8. Furthermore kappa coefficient was used to evaluate the agreement between the pond areas extents derived from available LANDSAT-8 images during the simulation period with the pond area extents results of GETFLOWS simulation. The analysis showed that GETFLOWS successfully simulated the surface water flow process. We conclude that the use satellite derived datasets can help calibrate and evaluate GEFTLOWS hydrologic model for an ungauged watershed like in the present case..