The application of modelling method for assessment the quantity and intensity of the run-off phenomenon

الملخص EN

This research aims to provide insight on the main foundations used for monitoring run-off phenomenon in the sub-humid regions and to provide a practical guide for mapping water erosion depending on climatic and spatial data.

There are plenty of models that have been developed for modelling water erosion process.

The majority of these models rely on rain characteristics, slope degree and length, vegetation status, soil properties for calculation of the quantity and intensity of water erosion.

Among these models the models of RUSLE: Revised Universal Soil Loss Equation and WEPP: Water Erosion Prediction Project are considered the most applied models.

In fact, in these two models the rainfall factor is the key factor in the run-off process and the rain intensity is used for deriving the genetic energy for the rain drops.

Despite the wide application of modelling methods for monitoring water erosion process in the developed countries, the use of modelling for this subject in the developing countries is still limited.

Actuality, it is essential to calibrate and validate the models developed in different climatic conditions before considering their results in area having diverent claimtic conditions.

The use of modelling in water erosion process can support comprehensive management of the watershed as it can be used as effective tools by the land policy makers to draw the agricultural and environmental policy and to decide the suitable land use in the region.

Thus in this study we highlighted the main steps required for modelling water erosion.