Mass Movements Hazard Zonation with Using Specific Interpolation and Giving Percentage to Each Sub Factors in Damavand Drainage Basin
Subject Areas : GeopoliticAli Asghar Mohammadi 1 , Sadat Feiznia 2
1 - ندارد
2 - ندارد
Keywords: Hazard Zonation, Mass movements, Specific Interpolation,
Abstract :
Recognition of effective factor in mass movements' occurrence and land slide Hazardzonation is one of the most important measures in prevention and reduction of theirhazards. In this research mass movements hazard zonation was done in DamavandDrainage Basin with 761 km2 area, located in Southern Albours Mountains using specificinterpolation method and giving percentage to each sub factors .For doing this, first massmovements inventory map of the area which was prepared using air photos with the scaleof 1:20000 and 1:50000 and field works. (Sefidgari, 2001) was used. In this map 410landslides, 162 falls, 56 soliflucsion, 26 soliflucsion flow and the total of 654 massmovements were shown. In this research, the effective factors for mass movements'occurrence were recognized to be as follows: land use, geological formation, rainfall,slope, aspect and elevation. Then by using mass movements' inventory map andquantification of effective factor in mass movements' occurrence, mass movements'hazard zonation was done in the area as follows: first mass movements inventory map wasquantified by giving percentages to each sub factor of above-mentioned factors. Foredoing this, all the factors that were quantified, were interred in to Arc view softwareenvironment as quantified, descriptive tables. Here all 654 movements were interred in todescriptive tables according to above-mentioned factors and sub factors. Then each factorand their quantitative number for mass movements were prepared as raster map. Thisprocess was done by extensional facilities of Arc view which is called "Extension SpatialAnalyst". The raster maps of six factors with cellular resolution of. /0014 meters, for massmovements were added together, in order to obtain hazard zonation of each movement.For evaluation of hazard zonation accuracy and separation ability of the used method,mass movements hazard zonation maps were overlaid with vector maps of massmovements' inventory maps and necessary change about the kind of considered factorswere made. The privileges of this method is as follows: It uses actual data obtained fromthe field works, by using this method, effective factors in mass movements occurrencecould be identified, it can be performed in any area, and the accuracy of hazard zonation isdepended on the accuracy of information gathered in the field. ward each other and thehigh distribution coefficient confirms this factor.
