GIS-based morphometric analysis of the Dewana basin, Sulaimani, Kurdistan, Iraq

Lanja H. Ahmed and Basim Al-Qayim
Department of Geology, University of Sulaimani, Sulaimaniyah, Kurdistan, Iraq


Abstract

An integrated remote sensing data are used in a detailed morphometric study of the
Dewana drainage basin, Sulaimani Governorate of the northeastern part of Iraq. The
basin is considered as a good example of a medium scale drainage basin of a
mountainous terrain with variable geomorphological processes and landscapes. Major
basin divides recognized by the homoclinal ridges of Baranan Mountain to the northeast
and Sagerma Mountain to the southwest.
Satellite images as well as Digital Elevation Model with topographic, geologic, and
structural maps were used in addition to field investigations to perform a GIS-based
drainage network and morphometric analysis. An analysis which becomes important
sources of the area with increasing agricultural development.
Arc GIS 9.3 was used for digitizing, measuring and drawing the spatial data of these
analyses. Detailed morphometric analysis was applied to the Dewana basin, using
variable geomorphological and hydrogeomorphological parameters, by calculating
network aspects from two sets of topographic maps at scale of 1:20,000 and 1:50,000.
Different sets of morphometric parameters were calculated such as: linear, relief and
aerial parameters. Morphometric analysis results are discussed and correlated with each
other and to standard values to evaluate fluvial-geomorphic evolution of the basin.
The study shows that the Dewana basin is of the 6th order drainage basin, with relatively,
high values of drainage density and basin relief which implies that surface runoff is not
rapidly removed from the basin, making it susceptible to gully erosion and landslides.
Shape parameters of the basin indicate that it has elongated form, which reflects strong
structural controls on the morphology of the basin. Drainage pattern is dominated by
dendritic, sub-parallel to sub-trellis types which emphasize structural controls in addition
to variable lithologic characters of the basin rocks.

Key Words:
Morphometic Analysis
,GIS, Kurdistan, Iraq


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