Delineation of the Watersheds Basin in the Konya City and Modelling by Geographical Information System

Year 2016, Volume: 11 Issue: 3, 303 - 311, 30.09.2016

Nahida Hameed Hamza Al-qaysi

Abstract

The purpose of this study is to delineation the watersheds basin in the
Konya city from topographical map using Shuttle Radar Topography Mission
digital elevation model (SRTM 1 Arc Second Digital Terrain Elevation Data - Global
(approx. 30 m resolution)) in ArcGIS. Digital elevation model (DEM) was used as
a main data source combination with the PC version of ArcGIS and Extract
hydrologic information from a digital elevation model (DEM) in ArcGIS using
Hydrology Tools. DEM's have been developed by the Earth Resources Observation
Systems (EROS) Data Center of the United States Geological Survey (USGS), and
downloaded from their internet site. A spatial hydrology model is one
which simulates the water flow and transport on a specified region of the earth
using GIS data structures, the boundary of the region is represented by a
polygon, such as a river basin boundary or an aquifer boundary. The results
showed that by using watershed function in ArcGIS for watershed delineation in
the Konya city basin and sub basin can be determined. This work is mainly a
case-study of simple applicability of GIS as a tool of watershed delineation
and drainage extraction. Watershed boundary, flow direction ,flow accumulation,
 flow length, stream ordering have been
prepared using Hydrology Tool; and contour has been prepared using Surface Tool
in ArcGIS-10.3.1 software and DEM, and build model for these processes then show
the DEM in three dimension in Arcsine. The total area of watershed calculated
from watershed layer is about (40233.94 km²) but according to Konya
Wikipedia it is works out to be (38,873 km²).

Keywords

Digital elevation models, Watershed delineation, Flow direction, Model Building, Geographic information systems

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