Investigation of Effective Factors on Landslides Occurrence and Landslide Hazard Zonation – Case Study Shirin Rood Drainage Basin, Sari, Iran
Methodology In the primary phases and after the field works and providing different maps, nine following factors Altitude classes, slope, aspect, rainfall, lithology, land use, distance from road, distance from fault and distance from hydrographic network, were determined as primary effective factors on landslides occurrence. Also, landslides distribution map of the area with doing field works and GPS recording was derived (Fig.1). After this phase all of the maps with using GIS techniques was analyzed. For doing this was used from Arc/info, Idrisi and Arc /view software and was supplied a data network. Then, each of the primary effective factor maps has been crossed with landslides distribution map in Idrisi software circumstance and earned results was analyzed (1). With doing this work, was determined that two factors, aspect and distance from hydrographic network are not effective on landslides occurrence of the area. Table 1 shows the most and low effect classes of each factor after the final analysis (4).  Figure. 1. Landslide distribution map of shirinrood drainage basin Table 1. The most and low effect classes of each factors
|