Volume 13, Issue 26 (12-2022)
jwmr 2022, 13(26): 105-114 |
Back to browse issues page
Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:
nasiri M, mohammadzade M, lotfalian M, parsakhoo A. (2022). Zoning and Field Study of Landslid es along Forest Roads of Darabkola-Sari. jwmr. 13(26), 105-114. doi:10.52547/jwmr.13.26.105
URL: http://jwmr.sanru.ac.ir/article-1-1183-en.html
URL: http://jwmr.sanru.ac.ir/article-1-1183-en.html
Abstract: (1163 Views)
Extended Abstract
Introduction and Objective: In the northern provinces of Iran, especially Mazandaran, Gilan and Golestan provinces, the percentage of landslides is relatively high due to the construction of forest roads. Considering the importance of road maintenance projects during the implementation of the forest respiration plan, it’s necessary to zoning areas suseptble to landslides. Given that the effects of the forest respiration plan were not studied; in this study we investigate the effect of respiration plan on the maintenance projects of forest roads. The purpose of this study is landslide hazard zoning around forest roads by considering the ground control points (GCPs) and modeling the factors affecting the occurrence of landslides around forest roads.
Material and Methods: Darabkola forest in the southeast of Sari was selected for this study. First, the factors affecting the occurrence of landslides were identified in the region. Then the layers of slope, slope direction, road network, soil and buffer of distance from road, fault lines and waterways was prepared using the QGIS 3.61 software. Also, GCPs from area suseptble to landslide as well as recently occurred landslides were recorded separately using the GPS device and then digitized in QGIS environment. Prioritization was performed using the analytical hierarchy process (AHP) and after applying the weight of the layers and reclassification, the final zoning map was obtained.
Results: According to the results, 29.71 and 35.28% of the area have very low and low risk of landslides, respectively. Also, 21.75% of the area has a medium risk, 10.89% of the area equivalent to 289 hectares has a high risk and 2.37% of the area which is equivalent to about 63 hectares of the area has a very high risk of landslides. The results of accuracy of landslide zoning showed that from 29 points recorded as ground control points, 22 of them are located in areas with high and very high landslide risk and only 4 of them are located in areas with moderate landslide risk. Therefore, the results of zoning are consistent with the ground reality with high accuracy and showed less efficiency in only 3 cases. In Darabkola forest, due to the presence of marl bedrock and lack of drainage, several shallow landslides with distances of less than 200 meters along the road have been recorded, which are developing due to lack of management. Also, most of the landslides in the study area observed at a distance of less than 200 meters from waterways. Field visits show that most recorded landslides observed in areas where the road crosses along valleys and or intersects the valleys and due to lack of drainage, it causes multiple landslide along the road.
Conclusion: This study showed that zoning confirms the ground realities. Accoeding to the intersection of roads and waterways in the valleys, Darabkola forest roads need projects related to soil and water conservation. It seems that improving the road drainage and using soil bioengineering methods can help to improve road maintainance and vegetation cover in landslide area.
Introduction and Objective: In the northern provinces of Iran, especially Mazandaran, Gilan and Golestan provinces, the percentage of landslides is relatively high due to the construction of forest roads. Considering the importance of road maintenance projects during the implementation of the forest respiration plan, it’s necessary to zoning areas suseptble to landslides. Given that the effects of the forest respiration plan were not studied; in this study we investigate the effect of respiration plan on the maintenance projects of forest roads. The purpose of this study is landslide hazard zoning around forest roads by considering the ground control points (GCPs) and modeling the factors affecting the occurrence of landslides around forest roads.
Material and Methods: Darabkola forest in the southeast of Sari was selected for this study. First, the factors affecting the occurrence of landslides were identified in the region. Then the layers of slope, slope direction, road network, soil and buffer of distance from road, fault lines and waterways was prepared using the QGIS 3.61 software. Also, GCPs from area suseptble to landslide as well as recently occurred landslides were recorded separately using the GPS device and then digitized in QGIS environment. Prioritization was performed using the analytical hierarchy process (AHP) and after applying the weight of the layers and reclassification, the final zoning map was obtained.
Results: According to the results, 29.71 and 35.28% of the area have very low and low risk of landslides, respectively. Also, 21.75% of the area has a medium risk, 10.89% of the area equivalent to 289 hectares has a high risk and 2.37% of the area which is equivalent to about 63 hectares of the area has a very high risk of landslides. The results of accuracy of landslide zoning showed that from 29 points recorded as ground control points, 22 of them are located in areas with high and very high landslide risk and only 4 of them are located in areas with moderate landslide risk. Therefore, the results of zoning are consistent with the ground reality with high accuracy and showed less efficiency in only 3 cases. In Darabkola forest, due to the presence of marl bedrock and lack of drainage, several shallow landslides with distances of less than 200 meters along the road have been recorded, which are developing due to lack of management. Also, most of the landslides in the study area observed at a distance of less than 200 meters from waterways. Field visits show that most recorded landslides observed in areas where the road crosses along valleys and or intersects the valleys and due to lack of drainage, it causes multiple landslide along the road.
Conclusion: This study showed that zoning confirms the ground realities. Accoeding to the intersection of roads and waterways in the valleys, Darabkola forest roads need projects related to soil and water conservation. It seems that improving the road drainage and using soil bioengineering methods can help to improve road maintainance and vegetation cover in landslide area.
Type of Study: Research |
Subject:
حفاظت آب و خاک
Received: 2022/02/14 | Revised: 2023/01/25 | Accepted: 2022/04/4 | Published: 2022/12/1
Received: 2022/02/14 | Revised: 2023/01/25 | Accepted: 2022/04/4 | Published: 2022/12/1
Send email to the article author
| Rights and permissions | |
 |
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
