Document Type : Research Paper

Author

Environmental Hazards Group, Natural Disasters Research Institute, Tehran, Iran

10.22059/jrwm.2024.377135.1767

Abstract

Landslides are one of the most destructive types of domain movements, and in this research, the probability of their occurrence in the Chakrod watershed of Siahkal city, Gilan province has been investigated using the TRIGRS program. This program is able to investigate areas prone to shallow landslides caused by rainfall and the effect of rainfall and runoff on the stability of the domain. In the present research, first, the required maps of the program, including the digital elevation model, topographic slope, surface runoff flow direction, engineering geological characteristics and soil type, soil thickness, depth of underground water level and precipitation data were prepared. Next, in the geographic information system (GIS), the maps produced in raster form have been converted into text files used in the TRIGRS program. By running the program, for each cell, the minimum stability safety factor, sliding depth and pore water pressure at that depth are calculated and presented in the form of a text file, which is again converted into a raster map using GIS software; This spatial distribution map is the minimum confidence factor and landslide potential zoning for the studied basin. The results of this research showed that this program has accurately predicted landslide prone areas after infiltration modeling and runoff routing. These areas include 1395.37 hectares equivalent to 8.9% of the area of the watershed and on parts of zone 2, consisting of soils with a lot of shale and containing a lot of clay minerals, and zone 3 including soils and sliding sediments that are on steep slopes and with The thickness of the soil is high, it is consistent.

Keywords

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