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Effect of root architecture on rainfall threshold for slope stability: variabilities in saturated hydraulic conductivity and strength of root-soil composite

Wang, Xinhao ; Ma, Chao ; Wang, Yunqi ; Wang, Yujie ; Li, Tong ; Dai, Zhisheng ; Li, Muyang

Landslides, 2020-08, Vol.17 (8), p.1965-1977 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
Effect of root architecture on rainfall threshold for slope stability: variabilities in saturated hydraulic conductivity and strength of root-soil composite
Autor: Wang, Xinhao ; Ma, Chao ; Wang, Yunqi ; Wang, Yujie ; Li, Tong ; Dai, Zhisheng ; Li, Muyang
Assuntos: Afforestation ; Agriculture ; Architecture ; Civil Engineering ; Density ; Dimensions ; Earth and Environmental Science ; Earth Sciences ; Flow stability ; Fractal geometry ; Geography ; Hydraulic conductivity ; Internal friction ; Natural Hazards ; Plant roots ; Rain ; Rainfall ; Rainfall intensity ; Roots ; Shear strength ; Slope stability ; Soil stability ; Soil strength ; Soil water ; Soils ; Technical Note ; Water flow
É parte de: Landslides, 2020-08, Vol.17 (8), p.1965-1977
Descrição: Plant roots positively and negatively contribute to hillslope stability by the perspective of soil strength and water flow infiltration improvement. To further examine the controversy, this work addresses the six root architecture types on the rainfall threshold for slope stability by tests of saturated conductivity and shear strength of the root-soil composite. An infinite slope model and a 1D flow model combine to obtain the rainfall intensity-duration threshold of slope failure. The results reveal that the saturated hydraulic conductivity of root-soil composite is 1 to 4.23 times of bare soil, which increases as the length density, volume density, and volume fractal dimension of plant roots. Furthermore, plant roots can enhance the cohesion and angle of internal friction by 35.19–81.79% and 12.92–42.36%, respectively. Finally, the R-type and V-type roots have the most effective root architecture for hillslope stability. In the process of afforestation, H-type may be suitable for areas with soft slope, while V-type and R-type may be suitable for steep slopes. The results of this work present an interesting study on the interaction of plant roots on slope stability, which is worthy of further study in the future.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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Effect of root architecture on rainfall threshold for slope stability: variabilities in saturated hydraulic conductivity and strength of root-soil composite

Wang, Xinhao ; Ma, Chao ; Wang, Yunqi ; Wang, Yujie ; Li, Tong ; Dai, Zhisheng ; Li, Muyang

Berlin/Heidelberg: Springer Berlin Heidelberg

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