Land capability zonation toward Landslide occurance Using Dempster-shafer and ‎Frequency Ratio Models

Document Type : Complete scientific research article

Authors

kharazmi university

Abstract

Background and objectives
Landslides are significant natural geologic hazard around the world. Expansion of urban and man-‎made structures into potentially hazardous areas leads to extensive damage to infrastructure and ‎occasionally results in loss of life every year.Identification of factor affecting existing of landslide ‎as well as its zonation in the given watershed is one of the basic tools for landslide control and ‎selection of appropriate and effective solution as well. Thus, a research study with objective of ‎recognizing factor affecting landslide and determination of lands with hypothential to its occurrence ‎was conducted to prepare landslide zonation map for the Sorkhoon watershed using Dempster-‎shafer and Frequency Ratio Models.‎
Materials and methods:‎
to reach this goal, after preparing of Landslide inventory map using field survey and aerial photo ‎interpretation , data layers of distance from stream , distance from faults , elevation, slope, aspect , ‎Topography wetness index (TWI), distance from roads , land use, lithology and Stream Power index ‎‎(SPI) as Factors affecting landslides were selected and after applying Dempster - Shafer and ‎frequency Ratio methods the final Landslide Hazard zoning was prepared. For calculating of ‎weight of Affective Factors, was used the analytic hierarchy process in the software of expert ‎choice . To validation of used methods the ROC curve was used
Results: ‎
The main factors that caused the landslides in this area based on field observations and Expertise ‎opinions include lithology , distance from roads and slope , respectively, with scores ( 181/0 , 163/0 ‎‎, 145/0 ) and vis-à-vis factors of rainfall, slope and Topography wetness index (TWI) respectively ‎with scores ( 018/0 , 036/0 , 054/0 ) have the lowest impact on landslides. According to the results, ‎Frequency Ratio Models have obtained higher AUC ( 0.927 ) as compared to the Dempster - Shafer ‎‎( 0.858 ) that shows the high correlation between Hazard Map and distribution map Landslide ‎inventory map and better evaluation of Frequency Ratio toward Dempster – Shafer model.‎
Conclusion:‎
The results of the validation showed that the frequency ratio model Has higher efficiency and ‎accuracy toward Dempster - Shafer model for preparing of zonation map. Based on the results of ‎the frequency Ratio model 21128200 square meters ( 7.05 percentage ) of the region located in the ‎very low risk class , 67,144,500 square meters ( 20.45 percentage ) of the area located in the low ‎risk class, 90,113,400 square meters ( 27.45 percentage ) located in the moderate Risk class, , ‎‎91733400 square meters ( 27.94 percentage ) of the area located in the high class, and finally ‎‎56.160000 square meters ( 17.11 percentage ) of the area located in the very high risk class. ‎

Keywords

References

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Journal of Water and Soil Conservation
Volume 24, Issue 3
August 2017
Pages 41-57

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