Calibration and Validation of the GR2M Hydrologic Model in the Kouilou-Niari Basin in Southwestern Congo-Brazzaville

The hydrologic simulation of a catchment area, described as the transformation rainfall into runoff, generally uses model. This work opts for global conceptual model GR2M, monthly time step model, to study Kouilou-Niari basin, second most important ones Republic Congo. includes two parameters behavior area. choice GR2M is justified by reduced number and scale. objective this determine characteristic calibrating validating procedure. use these enables follow evolution water resources from climatic variables. It has been first carried out characterization some physical, geological factors governing flow, dealing with main variables which constitute inputs Then, rainfall-runoff modeling allows calibrate validate at Taking account involved in processes complexity cathment gives acceptable results throughout basin. values Nash-Sutcliffe criterion those correlation coefficient obtained are greater than 80% validation, explains performance robustness on