Document Type : Research Paper
Authors
1 MSc, Soil Conservation and Watershed Management Research Institute, Iran
2 Scientific Board, Soil Conservation and Watershed Management Research Institute, Iran
3 Professor, Department of Geology, Tehran Shomal Unit, Islamic Azad University, Iran
Abstract
Geometrical parameters and river morphology are the main properties of each river which are used for river training, management and protection projects. So approaches to estimate these characteristics of Zohreh River are the main scopes of this research. Zohreh River as one of the permanent river of Persian Gulf basin has 64 km length in Hendijan delta and 169, 90 and 12 m3/s as maximum, average and minimum discharges
respectively. Mean High High Water (MHHW) level is 2.7 m that penetrates 17 km from river mouth upstream. Zohreh River banks are consisting urban, industrial, commerce and fishery activities which are sensitive to any changes on river regime and morphology parameters. Necessity of determining Zohreh River morphology and its
changes led us to do research using GIS and field observations methods. Aerial photos (1967), satellite images (TM, 1989 and ETM+, 2002), topography map, previous studies and Ilwis and AutoCAD softwares were the materials used in this research. Results have shown two river cut offs which occurred since 1967 and channel meandering increased from 43 meanders to 48. Also sinuosity coefficient decreased from 3.59 to 3.06 and mean radius curvature and wave length increased 26% and 0.06% respectively. According to Korins classification and mean central angle of Zohreh River, it is fallen in extreme developed meanders morphology category.
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