Journal article

Effect of instream logs on bank erosion potential: a flume study with a single log

Nuosha Zhang, Ian Rutherfurd, Marco Ghisalberti

Journal of Ecohydraulics | Informa UK Limited | Published : 2020


It is well established that riparian trees reduce bank erosion. However, fallen trees can increase bank erosion as the flow is deflected and accelerated between the log and its root-plate and the bank face, increasing the boundary shear stress and eroding the bank. This erosion contributes to hydraulic variability but can also be a concern in restoring wood loads in rivers. In this first quantitative study into this phenomenon, we develop a theoretical hydraulic model to estimate the near-bank velocity around a single log using principles of continuity and energy loss for a range of log characteristics (morphology, angle, distance from the bank) and flow characteristics. Flume experiments su..

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