سال انتشار: ۱۳۸۵
محل انتشار: هفتمین سمینار بین المللی مهندسی رودخانه
تعداد صفحات: ۸
Mohammad Zounemat Kermani – PHD student of hydraulic, Department of Civil Engineering, K.N.Toosi university, Vali- Asr & Mirdamad crossroad, Tehran, Iran
Saeed Reza Sabagh-Yazdi – Assistant professor, Department of Civil Engineering, K.N.Toosi university, university, Vali-Asr & Mirdamad crossroad, Tehran. Iran
Digital elevation models (DEMs) are readily available data sets that represent the elevation of the earth’s surface at discrete points in a
regular, rectangular grid. They also can be used to derive a wealth of information about the morphology of a land surface .The algorithms
included in most raster processing systems use neighborhood operations to calculate slope, aspect, and shaded relief and points of inflection. they also present non-neighbourhood problems such as determining direction of flow in the interior of large flat area. A major emphasis in geomorphology over the past six decades has been on the development of quantitative physiographic methods to describe the evolution and behaviour of surface- drainage networks. These parameters have been used in various studies of geomorphology and surface-water hydrology, such as flood characteristics, sediment yield, and evolution of basin morphology This paper presents an investigation and a method of using DEMs to determine the surface-drainage (runoff) network for a watershed. The characteristics of each part of the watershed are different. The results are provided by using the ArcGIS software.