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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >A new model to analyse the impact of woody riparian vegetation on the geotechnical stability of riverbanks
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A new model to analyse the impact of woody riparian vegetation on the geotechnical stability of riverbanks

机译：分析木本河岸植被对河岸岩土工程稳定性影响的新模型

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We present a geotechnical stability analysis for the planar failure of riverbanks, which incorporates the effects of root reinforcement and surcharge for mature stands of woody riparian vegetation. The analysis relies on a new method of representing the root distribution in the soil, which evaluates the effects of the vegetation's position on the bank. The model is used in a series of sensitivity analyses performed for a wide range of bank morphological (bank slope and height) and sedimentological (bank cohesion and friction angle) conditions, enabling discrimination of the types of bank environment for which vegetation has an effect on bank stability. The results indicate that woody vegetation elements have a maximal impact on bank stability when they are located at the ends of the incipient failure plane (i.e. at the bank toe or at the intersection of the failure plane with the floodplain) and that vegetation has a greater effect on net bank stability when it is growing on low, shallow, banks comprised of weakly cohesive sediments. However, the magnitude of these effects is limited, with vegetation typically inducing changes (relative to non-vegetated banks) in simulated factors of safety of less than 5%. If correct, this suggests that the well documented effects of vegetation on channel morphology must be related to alternative process mechanisms (such as the interaction of vegetation with river flows) rather than the mechanical effects of vegetation on bank failure, except in special cases where the equivalent non-vegetated bank has a highly marginal stability status. Copyright (c) 2007 John Wiley & Sons, Ltd.
机译：我们提出了河岸平面破坏的岩土工程稳定性分析，其中包括了对成熟的木质河岸植被林分的根系加固和附加费的影响。该分析依靠一种表示土壤根系分布的新方法，该方法可评估植被位置对河岸的影响。该模型用于一系列敏感性分析，针对广泛的河岸形态（河岸坡度和高度）和沉积学（河岸内聚力和摩擦角）条件进行分析，从而能够区分植被对河床环境产生影响的类型。银行稳定。结果表明，当木质植被元素位于初期破坏面的两端时（即在岸脚趾处或破坏面与洪泛区的交点处），对堤岸稳定性的影响最大。当其生长在低，浅，由弱粘性沉积物组成的浅堤上时，对净堤稳定性的影响。但是，这些影响的程度是有限的，植被通常会导致模拟安全系数的变化（相对于无植被的河岸）小于5％。如果是正确的话，这表明充分记录的植被对河道形态的影响必须与替代过程机制（例如植被与河水的相互作用）有关，而不是与植被对河岸破坏的机械影响有关，除非在特殊情况下等效的非植被银行具有很高的边际稳定性。版权所有（c）2007 John Wiley＆Sons，Ltd.

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