بررسي و ارزيابي روش هاي آماري دو متغيره و LNRF در پهنه بندي خطر زمين لغزش مطالعه موردي: حوزه آبخيز جنت رودبار

Assesment and evaluation bivariate statistical and LNRF models in landslide hazard zonation case study: Gennatroodbar catchment

One of the slopemovement is landslide as natural disaster in different regions which causes human loss and economic damages. In this research, at first Gennatroodbar catchment about 5240 hectar in Ramsar city was selected. Then with use of interpretation of arial photos with scale of 1:20000 and 1:40000 related to 1373 and 1380, geological, topographic maps and field survey using GPS, was prepared as dependent variables. Also information layers including slope,lithology ,distance from faults,aspect was prepared and digitized as independent variables in GIS environment integrated dependent and independent variables, landslide was calculated in each variable class and weighted in bivariate statistical and LNRF models. Finally, landslide hazard zonation map obtained with weight maps and their algebraic sum. models evaluation was done with use of density ratio(Dr) and quality sum(Qs). Results indicated that most of the area landslide has occurred in lithological units including marl,clay and silt(90 percent),slope classes 45-70 and 15-25(50 hectar). Also most of instabilities has occurred in north and west aspects(46.75 and 41.5 hectar), distance from faults 0-2 km (97 percent). This research indicated that quality sum in density area is 2.01,LNRF, 1.28 and information value 1.11.