Large wood in rivers and its influence on flood hazard

作者: V. Ruiz-Villanueva , A. Díez-Herrero , J.M. Bodoque , E. Bladé

DOI: 10.18172/CIG.2523

关键词:

摘要: In terms of flood hazard, the presence large wood (logs, trees, branches and roots) in rivers may aggravate consequences events. This material affect infrastructures such as bridges, weirs, etc., especially those intersecting forested mountain rivers. Until recently, a widely accepted practice was to systematically remove debris from river channels preventive measure. However, studies have shown that this be useless is transported deposited after each even not benefit long term natural balance ecosystem. Therefore, woody must managed included hazard risk analysis. paper we present comprehensive methodological approach study role rivers, with focus on hazard. First, understand dynamics recruitment, contributing areas delivering streams delineated recruitment mechanisms studied. Thus, an estimate can obtained potential volume deliverable wood. To analyse transport numerical model, which allows simulates behaviour individual pieces together hydrodynamics. Finally, impact magnitude events (in water level, flow velocity or flooded areas), using example occurred December 1997 Sierra de Gredos. The results allowed us reproduce deposit patterns during event reconstruct bridge blockage. caused upstream level rise by up 2 meters reduced velocity, favoured sediment deposits. Consequently, effects flooding were equivalent greater event. increase has been numerically quantified.

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