Investigation and Evaluation of Bivariate and Multivariate Statistical Methods in Landslide Hazard Zonation (Case study: Marbor River Basin)
2005
Shirani, Kurosh | Ghayoumian, Jafar | Mokhtari, Ahmad
In this research, Marbor river catchment (hydrologic unit of Kahredan) with 800 square kilometers area, located in south part of Esfahan province is studied. Landslide distribution map was prepared using aerial photos interpretation and was confirmed during field survey. Moreover by applying the other, There information sources such as maps, the factors affecting on landslide (8 factors) determined and proper maps in 1:50000 scales was prepared. In order to promoting accuracy, speed and facility, descriptive and spatial data were digitized using Ilwis software. A number of 4 conventional methods in Marbor catchment were analyzed. Before analyzing of the methods, using effective parameters in each method, landslide hazard map with appropriate classes was prepared. Using landslide Index equation and landslide precision, different methods were analyze and compared. Using landslide Index equation and landslide precision, different methods were analyze and compared. The obtained index and comparing landslide distribution map with landslide hazard zonation map (obtained with each method) results the best methods as fallowing, Bivariate method of Information Value, bivariate method of Density Area, multivariate using linear regression analysis and multivariate using discriminant analysis, respectively. Finally, Bivariate method however its simplicity has appropriate accuracy, So that the ultimate map is better overlapped to landslide potential of the region.
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