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Landslide risk zoning and spatial analysis of instability in rural settlements of Nahavand city with LNRF model
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Ali akbar Sarmadi seifi *  |
| ndri , sarmadi232003@yahoo.com |
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Abstract: (37 Views) |
This research examines the factors affecting the occurrence of landslides and spatial analysis of rural settlements, in which it uses the (LNRF) model using geographic information system. In terms of political-administrative divisions, the studied area is located in the south of Hamedan province in Nahavand city and in terms of geology in two zones of Sanandaj-Sirjan and High Zagros.
At first, records of landslide occurrences in Nahavand city were investigated based on field studies and library documents, and 42 landslides were identified and analyzed. Then maps of environmental factors including lithology, climate, land construction, slope and slope direction of the range and land use were prepared. Each of the environmental factors was overlapped with the occurrence of landslides, and the investigation and analysis of the occurrence of landslides in each of the environmental factors was done.
In this research, for zoning the risk of landslides from the LNRF model using GIS software with the integration of six geo-environmental factors including: lithology, land use, rainfall, distance from important tectonic faults, the slope of the slopes and the direction of the slopes, the landslide hazard zoning map in Three classes of low, medium and high risk areas were prepared. In this regard, the number of 42 identified landslides was named with an index called the formal coefficient of probability of occurrence of range movements (LNRF). This amount was calculated and zoned for each of the factors involved in landslides. The results obtained from the model show that 24 percent of the study area and 34 rural settlements are in the high risk zone, which is mainly limited to the northern slopes of Gareen Mountain, which has a slope between 15 and 30 percent, sensitive surface sediments (mainly clay) to the ground Landslides are close to springs and waterways and close to structural complications and faults. The obtained results show that the areas with high potential in the risk zoning map correspond to the location of the landslides.
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| Keywords: landslide, zoning, rural settlement, GIS, LNRF, Nahavand. |
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Type of Study: Research |
Subject:
سکونتگاههای شهری و روستایی
Received: 2024/04/21 | Accepted: 2025/07/12
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