Abstract. Hydrological characteristics such as topographic parameters, drainage attributes, and land use/land cover patterns are essential to evaluate the water resource management of a watershed area. In the current study, delineation of a watershed and calculation of morphometric characteristics were undertaken using the ASTER global digital elevation model (GDEM). The drainage density of the basin was estimated to be very high, which indicates that the watershed possesses highly permeable soils and low to medium relief. The stream order of the area ranges from first to sixth order, showing a semi-dendritic and radial drainage pattern that indicates heterogeneity in textural characteristics, and it is influenced by structural characteristics in the study area. The bifurcation ratio (Rb) of the basin ranges from 2.0 to 4.42, and the mean bifurcation ratio is 3.84 in the entire study area, which signifies that the drainage pattern of the entire basin is controlled much more by the lithological and geological structure. The elongation ratio is 0.14, which indicates that the shape of the basin has a narrow and elongated shape. A land use/land cover map was generated by using a Landsat-8 image acquired on 10 August 2015 and classified to distinguish mainly the alluvial deposit from the mountainous rock.
Abstract. The current research investigates the significance of remote sensing data to evaluate the fluviological features and to identify the morphometric parameters of Yalamlam basin, West of Saudi Arabia. Hydrological characteristics, such as topographic parameters, drainage attributes, and the land use, land cover pattern were evaluated for the water resource management of the watershed area. Under GIS environment, the delineation of the watershed and the calculation of morphometric characteristics using ASTER GGDEM was undertaken. The drainage density of the basin has been estimated to be very high which indicates that the watershed possesses high permeable soils and low to medium relief (Hadley and Schumn 1961). The stream order of the area ranges from first to sixth order showing semi dendritic and radial drainage pattern that indicates the heterogeneity in textural characteristics and is influenced by structural characteristics in the study area. The bifurcation ratio (Rb) of the basin ranges from 2.0 to 4.42 and the mean bifurcation ratio is 3.84 of the entire study area that signifies that the drainage pattern of the entire basin is much more controlled by the lithological and geological structure. The elongation ratio is 0.14, which indicates that the shape of the basin belongs to the narrow and elongated shape. Land use and land cover map were generated by using Landsat-8 image acquired on August 10th 2015 was classified to distinguish mainly the alluvial deposit from the mountainous rock. The study reveals that hydrological evaluation using ASTER GGDEM is more precise and applied with compared to other techniques at the watershed scale.
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