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Restoring Habitat Downstream of Dams: Challenges and Opportunities

Author(s): G. Mathias Kondolf

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Abstract: The profound impacts of dams on the channel form, bed sediments, and aquatic habitats of downstream reaches (such as incision, channel geometry simplification, and bed coarsening) are increasingly recognized. Restoring these habitats depends on restoration of physical processes, both flow and sediment supply, which are best understood in the context of basin-scale alterations to the fluvial system. Sediment trapping by dams can be compounded by other impacts such as aggregate extraction. Sediment starvation can be partially avoided through strategic placement of dams within the river network, and by implementing sustainable sediment management features to pass sediment through or around the dam.

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Year: 2018

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