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Restoration of the rivers Brede, Cole and Skerne: a joint Danish and British EU-LIFE demonstration project, III—channel morphology, hydrodynamics and transport of sediment and nutrients

✍ Scribed by B. Kronvang; L.M. Svendsen; A. Brookes; K. Fisher; B. Møller; O. Ottosen; M. Newson; D. Sear

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
139 KB
Volume
8
Category
Article
ISSN
1052-7613

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✦ Synopsis

  1. A comprehensive monitoring programme was initiated for the Brede, Cole and Skerne river restoration projects in order to elucidate the impact of re-meandering on flood levels, floodplain inundation, adjustment of river morphology, sediment transport and overbank sediment deposition.

  2. Reducing the bankfull capacity, raising the bed level and lowering the bank level allowed an increase in flooding frequency and in the amount of water passing onto the floodplain in all three rivers. In the river Brede, restoration of the natural hydrological contact between the river and its floodplain resulted in high deposition of sediment (189 t year -1 ) and sediment-associated phosphorus (770 kg P year -1 ).

  3. Construction work caused excessive downstream loss of sediment and phosphorus as documented from sediment mass balances for the River Brede and River Cole. Short-term adjustments in river morphology were recorded in the River Cole based on the fluvial auditing procedure. Post-restoration morphology changed compared with that before restoration in terms of both total diversity and the type of features recorded.

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