How wood in rivers affects flood risk

Indonesia’s flood phenomenon: this coukd be one of the explanation

The River Management Blog

Look upstream at a logjam

UPDATE: This work was accepted for publication in the journal “Earth Surfaces Process & Landforms” on 12/02/2016.

One of the key objectives of my PhD research at University of Southampton was to try and assess how changing volumes of wood in rivers affects the likelihood and magnitude of flooding. The amount of wood in rivers can increase for various reasons, such as artificial insertion in the river for river restoration, river managers choosing to cease clearing natural deadwood from channels, or the growth/restoration of streamside (riparian) forests. We know that if wood is put into a river then flood water moves slower through/around it, and thus for a short distance downstream flood water will have a longer “travel time”. What no-one has done before is look at the effects upon flooding at a distant downstream location (such as a town) of changing the speed water moves through a small…

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