Résumé:
The use of modern techniques in the study of the external geodynamics of Oued-Al-Nadja basin is one of the topics that are closely related to the environmental, economic and social problems of a complex geographical area wich is located in the North-East of Algeria. In this research, remote sensing and geographic information systems (GIS) techniques were used to exploit the DEM model in order to obtain the morphological and physiological characteristics of the study area and the factors influencing the external dynamics of the surface such as the slopes as directions, heights and their effect soil and its types, the study of the formal characteristics of the basin, and the hydrographic study of water net work in terms of regulation, gradient, discharge density and shape. The satellite imagery of the with its genesations was used to explore the of earth its characteristics, vegetation and its densities, population centers and distribution of the satellite from Landsat and its distribution from optical and optical analysis of satellite images and the use of mathematical indicators based on mathematical equations to distinguish between different regions as well as analysis and processing of statistical data for the population and elements of the climate recorded in few stations distributed within the basin using specialized GIS programs to create a database for the basin. This is done in order to monitor and fellow the dynamics of the surface in Oued-AlNadja and to identify the most important factors that lead to soil erosion, Thus posing a threat to humans and their environment in the near and long term.
