Automatic delineation of a watershed using a DEM. Case study – The Oltet watershed

Andreea ZAMFIR, Daniel SIMULESCU

Abstract


This paper aims to present some solutions for automatic delineation of a watershed. In order to find this study’s applicability in the geographical reality, we decided that the river whose watershed will be delineated to be Oltet river. Automatic delineation of the Olteţ watershed was carried out comparatively, using two softwares, ArcGIS Desktop 9.3 and
Quantum GIS 1.7.0 Wroclaw, and it based on a SRTM digital elevation model of 90 m. After using GIS techniques, there have resulted two maps showing the boundary of the
Olteţ watershed. By overlapping the resulted maps, obtained with ArcGIS and QGIS, we found some small differences generated by the different way of working of each software
involved in this study. We have also calculated a circularity coefficient for the Oltet watershed and the value obtained supports its elongated form and all the implication of it.

Keywords


DEM, watershed, Olteţ, Arcgis Desktop 9.3, GRASS, Quantum GIS

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