Investigation of Effective Factors on Landslides Occurrence and Landslide Hazard Zonation – Case Study Shirin Rood Drainage Basin, Sari, Iran
Landslides hazard zonation of shirinrood drainage basin With regard to seven effective factors that determined, Landslide hazard zonation of the area was done. For doing this, have been used from method of valuing area accumulation. Landslide hazard zonation with using valuing area accumulation method: The weight of different classes of each causative factor in this method is derived from equation 1 (2): 
Where: A: The number of landslides in each class of factors. B: The area of each class of factors. C: The number of total landslides in shirinrood drainage basin. D: The total area of shirinrood drainage basin. After was derived the weight of different factors classes (Table 2), this weight was generalized to each maps of factors with using RECLASS menue in Idrisi software circumstance (1). Then, was derived landslide hazard zonation map with overlaying of final maps in related to different factors and summing of each pixel values. Finally, the earned zonation map was classified into five hazard zones. For classification of the zonation map, at first was drawn the cumulative curve of pixels frequencies versus the values of pixels in Excel software circumstance and was used of it in classification of hazard zones.
 Fig.2. Landslide hazard zonation map using area accumulation method |
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