Sunday 1 August 2010 by Libadmin2005

5th International Scientific Conference - SGEM2005, www.sgem.org, SGEM2005 Conference Proceedings/ ISBN: 954-918181-2, June 13-17, 2005, 567- 578pp


Landslide Hazard Zonation (LHZ) is a method to evaluate the risk where there is the
potential for landslides. Therefore, many terrain factors affecting the landslides have been
exposed firstly. The factors contributing to the hazard in an area can usually be identified,
results of the investigations frequently being presented as a landslide hazard zonation map
indicating zones of similar risk of the occurrence of a landslide. North railway track is one of
the areas susceptible to landslides in Iran, consist of several landslide evidences. The effects
include damage or distrurbance to villages, farmlands and railway as well as the
exacerbation of erosion of the land surface and consequently an increase in the rate of
transportation of sediments. The method of landslide zonation used in this study was based on
a simple grid unit. A number of factors contributing to the likelihood of landsliding were
considered, including lithology, slope, tectonic and seismotectonic , human activity and
hydrology. For each grid unit, the incidence of landsliding and an assessment of the likely
contributory factors were recorded in terms of a surface percentage index. A computer
program was written using fuzzy sets to calculate the LHZ for each unit. This was used to
prepare the LHZ map. Finally, the study area has been classified into five classes of relative
landslide hazard, namely, very low, low, moderate, high and very high. The result shows that
the study area with nearlly 20.2 percent of its surface being affected by high and very high
landslide hazard.