Document Type : Research Paper
Authors
1 Assistant Professor, Soil Conservation and Watershed Management Research Institute, Iran
2 Associate Professor, Faculty of Geography, Tehran University, Iran
3 Assistant Professor, Soil Conservation and Watershed Management Research Institute, Iran
Abstract
One of the hillslope movement processes is land sliding which causes both human loss and economic damages. Factors such as structural and dynamic developed landforms , forests clearing, incorrect technical principals in construction and maintenance of rural and forest roads, lack proper management and using existing resource causes much damages to rural settlements, construction activities, forest, rangeland, and agriculture lands every year. Landslide Hazard Zonation is the first step for proper land management to overcome these problems. To prepare LHZ, several thematic layers such as lithology, slope, elevation, land use, distance from faults and distance form drainage were digitally prepared. Landslide distribution map of the area was prepared through Arial photos interpretation and also field checks. The thematic layers were integrated using information value, area density and LNRF models in a GIS environment. Finally to validate the results, a sub-basin was selected as a control area and the calculated weights for this sub-basin were applied for the rest of the catchments. The result of this investigation indicates that most of the landslide occurred in pdr, Js lithological units composed of marl, clay and silt layers, slope class 30- 50 and on elevation 2000- 2500 m. Also, most of the instability are on rangeland and occurred in a distance of 0-300 m from drainage network. The research shows that the estimated percentage of high hazard class is 79, 63, and 66 percent for area density, LNRF, and information value models respectively.
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