An Evaluation of Potential Vulnerability of slopes on the landslide occurrence in mountain's catchment by determining special factor method Case Study: Garangoo,s Catchment, Northern Slope of Sahand Mountain in East Azerbaijan

Author
M. Bayati Khatibi
Assistant professor, Department of Geographical research group ,Tabriz University
Abstract
The landslide events on the slope of mountains catchment is the result of the activity of many processes and also the effects of many factors, such as litology, slope, land use, amount of precipitation, fault, road and stream. These factors play an important role on the landslide events in mountain region, but in a particular site ,a special factor always plays the major role on these events so that determining of this factor in the prevention action is of great importance .In Garangoo,s catchment, which has special differences in term of litological and geological characteristics and also in terms of the shape of connection between human and environment, the differences in these characteristics ,causes of the landslide events to be different. In this paper, regardeding the distribution of the landslides on nine map layers of the agents, map was event frequency calculated and special factor was selected on triggering of the landslide events ,by using a the determination of special factor method. In the final stage, using Arc/View was zonate the potential vulnerability area with the related landslide events. This calcution and zonation map showed that volcano ash and marl, that old and large landslides have been occurrend over these materials, are favorable areas for the landslides occurrence. On the other parts of Garangoo,s catchment, irrigation planting ,with disturbance outcome on the slope, has become the major triggering factor on the landslides occurrence.

Keywords

The Journal of Spatial Planning and Geomatics
Volume 11, Issue 0
March 2007
Pages 29-56