Geomorphologic Study of Rock-fall Hazard in Kermanshah-Ilam, from Homeil City to Shabab Village

Homeil-Shabab road, a part of communication road of Kermanshah –Ilam, was established to shorten the distance between these two cities in 2006-2009. Since that time, the road has witnessed the events like rock-fall of the slopes.The present study aims at not only investigating the reasons for rock-fall event but also determining the dangerous regions for the aforesaid phenomenon. Therefore, the area was testes through field studies and 33 fall areas along the road were recognized. Each area was evaluated according to 11 parameters including slope sloping, slope height, slope materials, the distance of the slope from the surface of the road, shape of the roadside, slope vegetation, slope direction, slope geological construction, shape of slope sloping, the distance of the rock-fall area from the fault and the length of slope in direction of horizon to determine the amount of rock-fall danger. A numerical value from 1-10 was assigned to each parameter. Then, the quantitative value of each area was assessed according to the aforementioned parameters. The findings show that out of all 33 fall areas, 6.6% areclassified as the low –hazard class, 30.30% in the moderate-hazard class, 39.39% in the high-hazard class, and 24.24% in very high-hazard class.