Document Type : Research Paper
Authors
1 Professor, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
2 Assistant Professor, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
3 M.Sc. Student, Geomorphology in Environmental Planning, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
4 Lecturer of RS & GIS Center, Shahid Beheshti University, Tehran, Iran
Abstract
Landslides and slope instabilities are major hazards for human activities often causing economic
losses and property damages. Sikan River Basin (Ilam province) due to the topography, tectonic,
lithology, and climate has enough potential for occurrence of this phenomenon. The objectives of this
study were to determine effective parameters controlling the landslide occurrence and to prepare
zonation map of landslide risk in Sykan River Basin. In view of this, 11 geophysical characteristics
including (height, slop, slop direction), geomorphologic (the slop of land surface), geology (lithology,
the distance from the fault), hydrography (the distance from the river), coverage, land use (land use
and the distance from road, the distance from village), pedology (soil texture), and dependent variable
(landslide distribution) were selected an independent variable and were analyzed using logistic
regression model. The results showed that the influential factors on landslides occurrence in the basin
are the distance from river, land use, the distance from village, the materials (lithology), slope, and the
shape of land surface. Finally, the study area was classified into five major area based on landslide
occurrence risk which 19.1 km2 of total area had very low risk, 15.9 km2 had low risk, 14.9 km2 had
average risk and 14.6 km2 had high risk and 9.1 km2 had also very high risk. The model evaluation
showed a high accuracy 74.2% in the study area. The results of this study can be useful for landslide
risk management and for controlling the accelerated parameters.
Keywords
)