Using global sensitivity analysis to quantify the uncertainty of root reinforcement in vegetated slope stability

IF 3.9 2区 农林科学 Q1 AGRONOMY Plant and Soil Pub Date : 2025-01-15 DOI:10.1007/s11104-024-07162-z
Jiantang Xian, Jun Zhu, Anthony Kwan Leung, Chenguang Wu, Song Feng, Jie Zhang
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Abstract

Aims

Variabilities of vegetation and soil cause uncertainty to the factor of safety (FoS) of unsaturated vegetated slopes, yet the significance of these variabilities on the uncertainty of FoS is unclear. This study aims to quantify the effect of the uncertainties of root reinforcement and soil hydromechanical properties to the uncertainty of the FoS.

Methods

The variance‐based global sensitivity analysis was adopted to evaluate how the variance of FoS of vegetated slopes can be apportioned by the variabilities of soil and root parameters. A copula theory was applied to model the correlation amongst the parameters.

Results

For slip depths shallower than 0.30 m, the major source of the variance of the FoS included the parameters that define root reinforcement, followed by the parameters of soil shear strength. The variation of transpiration‐induced soil suction had limited effect on the FoS variance under heavy rainfall. Taking into account the correlations amongst the parameters had minor influence on their contribution to the variance of the FoS.

Conclusions

We observed threshold slip depths, where the relative contribution of uncertainties in root and soil parameters on the FoS uncertainty underwent a transition. Root reinforcement for slips as deep as 0.60 m can provide reliable slope stabilisation effects.

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采用全局敏感性分析方法量化植被边坡根系加固的不确定性
目的 植被和土壤的变异性会对非饱和植被边坡的安全系数(FoS)造成不确定性,但这些变异性对安全系数不确定性的影响尚不清楚。本研究旨在量化根系加固和土壤水力学性质的不确定性对安全系数不确定性的影响。方法采用基于方差的全局敏感性分析,评估土壤和根系参数的变异如何分摊植被边坡安全系数的变异。结果对于滑移深度小于 0.30 米的斜坡,FoS 变异的主要来源包括定义根系加固的参数,其次是土壤抗剪强度参数。蒸腾作用引起的土壤吸力变化对暴雨下的 FoS 变异影响有限。我们观察到,在临界滑移深度,根系和土壤参数的不确定性对 FoS 不确定性的相对影响发生了转变。对 0.60 米深的滑移进行根部加固可提供可靠的边坡稳定效果。
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来源期刊
Plant and Soil
Plant and Soil 农林科学-农艺学
CiteScore
8.20
自引率
8.20%
发文量
543
审稿时长
2.5 months
期刊介绍: Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.
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