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Journal of Applied Sciences

Year: 2009 | Volume: 9 | Issue: 23 | Page No.: 4115-4126
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Authors

R. Khavari

M. Arian

M. Ghorashi

Keywords

Research Article

Neotectonics of the South Central Alborz Drainage Basin, in NW Tehran, N Iran

R. Khavari, M. Arian and M. Ghorashi
The study records evidences of neotectonic activities in the South flank of the Central Alborz mountain range that found to be responsible for the present-day geomorphic set-up of the area since the last phase of major uplifting. Geomorphic indices indicate the presence of differential uplifting in the geological past. Neotectonic activity of the study area is investigated by a large number of geomorphic indices of DEM-derived catchments and drainage lines using GIS: drainage basin asymmetry, stream gradient, channel width and depth as well as sinuosity. The stream network asymmetry was studied using morphometric measures of transverse topographic symmetry, asymmetry factor and drainage basin shape. Analysis of the drainage basin and a number of subcatchments in the study area results in a field of T-vectors that defines anomalous zones of the basin asymmetry. This method demonstrates a neotectonic tilting of the drainage basin toward W-NW. Subcatchments of the basin indicate different directions of stream migration depending on their flow direction in the area. There are neither lithologic controls nor localized climate that causes the asymmetry, so it seems reasonable for the stream migration that tectonics can account.
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