Development of a Coupled Hydrologic-Land Surface Model to Improve River Flow Simulation in the Karkheh Basin

Document Type : Research Paper


1 PhD, Department of Irrigation and Reclamation, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.

2 Associate Professor, Department of Irrigation and Reclamation, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.

3 Associate Professor, Institute of Geophysics, University of Tehran, Tehran, Iran.


In this study, with the aim of improving river flow simulation, the effect of coupling between Atmosphere-Land Surface Interaction Scheme (ALSIS) and HBV hydrological model in Karkheh Basin and its sub basins without considering South Karkheh basin was investigated. Before coupling, comparison between soil moisture of HBV model and ALSIS scheme was performed and the accuracy of soil moisture results of both models was evaluated with observational data.Some metrics such as NSE, RMSE, BIAS and RSR were used to compare the simulated and observed data. Comparison of simulated soil moisture results by ALSIS and HBV with observational data showed that in all sub-basins there was better agreement between ALSIS soil moisture and observational data (compared to HBV). The ALSIS scheme showed better simulation in wet seasons and high humidity and HBV model in dry seasons and low humidity. The ALSIS-HBV coupled model performed better than HBV in all sub-basins and the entire Karkheh Basin, especially at high flow. The best results were obtained for the Ghare Sou subbasin with NSE=0.76 – 0.88, RMSE=7.7 – 4.5 mm per month, and RSR=0.49 - 0.34. The greatest reduction in BIAS erroroccurred in the Kashkan subbasin, which decreased from 0.24 to 0.03.


Main Subjects

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