The Role of Vegetation on Debris Slope Stability (Case study: Tuskestan– Chaharbagh Road, Golestan Province)

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Mohsenipour Sowmeh Saraei H.; NAJAFI NEJAD A.; HOSSEINALIZADEH M.; FOROUZEH M.R.; PARSAKHOO A.

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Journal: Journal of Water and Soil Conservation Year:2021 | Volume:27 | Issue:5 Page(s): 185-200

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Title

The Role of Vegetation on Debris Slope Stability (Case study: Tuskestan– Chaharbagh Road, Golestan Province)

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Keywords

Bioengineering

Debris slope

Root tensile strength

Slope stability

Vegetation

Abstract

Background and Objectives: One of the problems that human beings face due to maladministration and overexploitation of existing resources is the instability of the Debris slopes. Problems often caused by slope instability include road accidents, road blockage and financial and human losses. There are various methods for stabilizing unstable slopes. One of these methods is to apply the Vegetation because of features such as Bioengineering capabilities, economical issues, bio-technical issues and high durability, self-regeneration, self-renewal and no negative impacts on the environment at Slope stability. The purpose of this study is to investigate the role of plant species in the stability of Debris slopes of Tuskestan-Chaharbagh road as a Bioengineering approach. Materials and Methods: Firstly, the study area was investigated and 35 locations (14 locations were stable and 21 locations were debris) were selected for sampling from plants and soil. The sampling of roots was done at the depth of 0-30 cm of the dominant species at each slope and the sampling of soil was conducted at the depth of 0-20 cm. The density and canopy percentage of the Vegetation at the grasslands and forests were measured respectively with square plot (1 m 2 ) and circular plot (100 m 2 ). Some of the soil characteristics such as: shear strength, cohesion, internal friction angle, humidity, aggregate stability, slope, gradation curves (the percentage of fine-grained and course-grained particles) and the Root tensile strength of the dominant species were measured at some of the slopes. The study was tested by the independent T-test using SAS software. Results: The results of the experiment showed that the mean of the above parameters on the stable and Debris slopes were: 0. 1739-15. 82 kg/cm 2 for shear strength, 0. 0996-0. 0999 kPascal for cohesion, 11. 071-0. 928% for humidity, 0. 4343-0. 4588% for aggregate stability, 35. 5-43% for slope and 183. 34-108. 93 mega Pascal for Root tensile strength. Vegetation also had meaningful impacts on the above parameters at the 5% level and it should be added that the density and canopy percentage of Vegetation, were more at stable slopes compared with the Debris slopes. The dominant rangeland at the stable slopes were species (Melica persica) and (Astragalus sp. ) and at the Debris slopes specie (Tussilago farfara). On the other hand, dominant tree species at the stable slopes was (Carpinus betulus) and shrub species (Rubus sp. ) at the Debris slopes. The species (Melica persica) and (Astragalus sp. ), with the highest density average of grassland herbaceous and bush plants with the highest average of canopy percentage and also the tree species (Carpinus betulus) with the highest average of canopy percentage, has had the most impact on the slopes stability and soil conservation. On the other hand, the specie of (Crataegus monogyna) with the highest density average of shrubs plants and the highest average of canopy percentage has had the most impact on the slopes instability. Conclusion: The Vegetation with a high density and canopy percentage leads to the increase of shear strength, internal friction angle, course-grain particles percentage, soil humidity and Root tensile strength and causes a decline at cohesion, fine-grain particles percentage, aggregate stability and slope at the stable slopes in comparison with the Debris slope and therefore results in the fixation of the slope. Therefore, Vegetation is considered as Bioengineering method for the fixation of the Debris slopes.

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APA: Copy

Mohsenipour Sowmeh Saraei, H., NAJAFI NEJAD, A., HOSSEINALIZADEH, M., FOROUZEH, M.R., & PARSAKHOO, A.. (2021). The Role of Vegetation on Debris Slope Stability (Case study: Tuskestan– Chaharbagh Road, Golestan Province). JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 27(5 ), 185-200. SID. https://sid.ir/paper/961738/en

Vancouver: Copy

Mohsenipour Sowmeh Saraei H., NAJAFI NEJAD A., HOSSEINALIZADEH M., FOROUZEH M.R., PARSAKHOO A.. The Role of Vegetation on Debris Slope Stability (Case study: Tuskestan– Chaharbagh Road, Golestan Province). JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2021;27(5 ):185-200. Available from: https://sid.ir/paper/961738/en

IEEE: Copy

H. Mohsenipour Sowmeh Saraei, A. NAJAFI NEJAD, M. HOSSEINALIZADEH, M.R. FOROUZEH, and A. PARSAKHOO, “The Role of Vegetation on Debris Slope Stability (Case study: Tuskestan– Chaharbagh Road, Golestan Province),” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 27, no. 5 , pp. 185–200, 2021, [Online]. Available: https://sid.ir/paper/961738/en

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