تحليلي بر محدوديت هاي پهنه بندي مناطق حساس به حركات توده اي

An Analytical Approach on Limitations of Mass Movement of West and South- West of Sensitive Zonation (Case Study: Orumiyyeh Area)

Alongside the rapid development of computer hardwares and softwares in late 1990s, the use of Geographical Information Systems (GIS) in Iran has been accelerated for zoning sensitive areas for occurance of landslides. However, the utilization of such services and facilities would not present precise results without some consideration of base data. The western and south-western parts of Orumiyyeh are generally susceptible for toppling and rotational landslide occurrences. It was emerging at first glance that the ground level data could be easily accessed;hence, regarding the available facilities, seven land characteristics including slope gradient, hydrography, vegetation cover, pedology, lithology, landuse, and the land permeability were extracted by GIS analysis. However the results of this analysis indicated these data were suffering either from their scales, lesser validities due to shortage of research backgrounds. Therefore, relying on these insufficient data could only resulted to the very small scale and general maps. Although the hazard/susceptibility maps of landslides have applications in some of development and watershed management schemes, one can carry out a cost - effective zoning with detailed and comprehensive study of important or the most important influential factors of landslides.