Modélisation hydrologique des bassins de la Mitidja.

Abstract

The prediction of the behaviour of the water cycle is linked to the climatic change which affects the balance of nature. For that various methods have emerged, among them the models rain-flow in hydrology. As part of our study, we have chosen the conceptual model of Rural Engineering with two parameters adjustable in the monthly time step (GR2M) developed by a group of Cemagref (Antony) by Mouelhi in 2003 and we applied it on the watershed of the Mitidja plain for the prediction of hydrological changes in future horizons and this from the reference periods of previous years (1969-2003). The Gr2m model divides into two tanks: production tank and routing tank adding an external output of the basin other than the atmosphere; all this by mathematical resolution and a well-designed algorithm. Our work is divided into two stages: calibration and validation of the parameters by flow simulation from the rainfall and monthly potential evapotranspiration and comparing it with the observed flow.