Wood is recognized as a key element of river ecosystem for a large number of positive feedbacks with biotic and abiotic components, both when it is present as large wood deposit or as live vegetation on the riparian zone. Despite the positive impacts of wood, when considering the high flow events, the presence of woody riparian vegetation within the channel can increase the potential risk related to local wood accumulation, bridge clogging or damages at hydraulic structures. Both the effects given by the riparian vegetation and in-channel dead wood need to be considered when evaluating the large wood-related hazards in rivers. For these reasons, we need to increase the knowledge on the relative importance of floodplains in recruiting large wood. An analysis was conducted on the base of a post event field survey on the Ombrone Grossetano River (Italy) which helped to identify the main variables controlling the uprooting process of riparian vegetation. The implementation of a conceptual model for plant stability helped to predict the tree uprooting that occurred during that flood event. The proposed approach can be extended to any other gravel-bed rivers, such that the evaluation of the vulnerability of woody riparian vegetation can give practical advices for maintenance strategies about vegetation cutting.

中文翻译：

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洪水事件中木质河岸植被的脆弱性

木材被认为是河流生态系统的重要组成部分，当大量生物沉积物或河岸带上的活植物存在时，木材会产生大量具有生物和非生物成分的积极反馈。尽管有木材的积极影响，但考虑到高流量事件，通道内木质河岸植被的存在会增加与局部木材积聚，桥梁堵塞或水工建筑物损坏有关的潜在风险。在评估河流中与木材相关的大型危害时，必须考虑河岸植被和河道内枯木的影响。由于这些原因，我们需要增加对洪泛区在招募大型木材方面的相对重要性的认识。在事后对Ombrone Grossetano河（意大利）进行的现场调查中进行了分析，这有助于确定控制河岸植被连根拔起过程的主要变量。植物稳定性概念模型的实施有助于预测在洪灾期间发生的树木连根拔起。所提出的方法可以扩展到任何其他砾石河床，这样对木质河岸植被脆弱性的评估可以为维护植被砍伐的策略提供实用建议。