抽象的

Morphometric analysis of a Guigou Sub- Watershed, Sebou Basin, Middle Atlas, Morocco Using GIS Based ASTER (DEM) image

My Hachem Aouragh , Ali Essahlaoui

Morphometric analysis of watersheds involves the quantification of the channel network and related parameters such as drainage area, gradient and relief. They play a vital role for understanding the geo-hydrological behavior of drainage basin and express the prevailing climate, geology, geomorphology, structural, etc. The present work is an attempt to carry out a detailed study of linear and shape Morphometric parameters of Guigou watershed by using ASTER (DEM) image and Geographical Information System (GIS) techniques. Drainage pattern of the study area is sub-dendritic and parallel with moderate drainage texture. Sub-dendritic drainage pattern of the study area exhibit homogeneity in texture and lack of structural control but parallel drainage pattern suggest that the area has a gentle, uniform slopes and with less resistant bed rock. The mean bifurcation ratio value is 3.88 which indicates geologically controlled drainage pattern. The variation in stream length ratio might be due to changes in slope and topography. The study of morphometric analysis using remote sensing and GIS techniques plays a major role in determining the fluvial landforms in a basin scale and considered very useful for planning and management of drainage basin.