Evaluation of geomorphological and geological parameters in landslide hazard mapping using fuzzy logic and AHP method (Case Study: a part of Haraz Watershed)

In this study landslides occurred in a part of Haraz watershed were determined using aerial photos and field studies, then landslide hazard zonation was determined using geomorphological factors (slope, aspect and elevation) and geological factors (lithology and distance fault) as the most important effective factors on landslide hazard. So each of the effective factors as information layer was used in ILWIS environment for analysis based on fuzzy set theory using MATLAB 7.1 software before that membership functions were determined for each effective element on landslide. Then output of software computed hazard for each pixel inacase study map transformed to ILWIS software environment and landslide hazard zonation was made using fuzzy Gaussian and Triangular membership functions. Evaluation of results showed that landslide hazard mapping using gaussian membership function QS (0.23) is more accurate in comparison with map made by using triangular membership function QS (0.0515).