Abstract
To achieve the morphometric analysis of Abdan basin, Survey of Yemen Geological Survey and Mineral Resources Board (YGSMRB) topomaps in 1:100000 scales are procured and the boundary line has been extracted by joining the ridge points. The drainage map is prepared with the help of GIS tool and morphometric parameters such as linear, aerial and relief aspects of the basin have been determined. For detailed study we used SRTM data for preparing DEM, elevation and slope map. GIS was used to estimate the linear, aerial and relief aspects of morphometric parameters. The result indicate that the drainage area is 922.933 km 2 , perimeter 163.115 km, basin length 54.156 km, drainage texture 1.974, constant of channel maintenance 1.145, the stream frequency 0.349, drainage density 0.873, length over flow 0.572. Mean bifurcation ratio 4.355 so the drainage pattern has not been disturbed by structural disturbance. Form factor 0.315 and circulatory ratio 0.436 indicate that the basin is sub-circular to elongate in shape.
Highlights
Drainage basins are the fundamental units to understand geometric characteristics of fluvial landscape, such as topology of stream networks, and quantitative description of drainage texture, pattern, shape and relief characteristics (Obi Reddy et al, 2004; Subba Rao, 2009)
Morphometric analysis of a river basin offers a quantitative description of the drainage system, which is an important aspect of the characterization of basins (Strahler, 1964)
The study of linear aspects shows that the basin has formed subdendritic to subparallel type drainage pattern with highest order fifth
Summary
Drainage basins are the fundamental units to understand geometric characteristics of fluvial landscape, such as topology of stream networks, and quantitative description of drainage texture, pattern, shape and relief characteristics (Obi Reddy et al, 2004; Subba Rao, 2009). Morphometric analysis is an important technique to evaluate and understand the behaviour of hydrological system. Morphometric analysis of a river basin offers a quantitative description of the drainage system, which is an important aspect of the characterization of basins (Strahler, 1964). The morphometric analysis is performed through measurement of linear, aerial, relief, gradient of channel network and contributing ground slope of the basin (Ali, 1988; Nautiyal, 1994; Nag and Chakraborty, 2003; Magesh et al, 2012b). Morphometric analysis of a river basin comprises of discrete morphologic region and has special relevance to drainage pattern and geomorphology (Strahler, 1957; Dornkamp and King, 1971)
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