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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Managing deltas : Case study Ęc delta restoration at a steep river mouth
Case study Ęc delta restoration at a steep river mouth
Author : TERRIER S.(1), DE CESARE G.(2), SCHLEISS A.J.(3), ANDRĘŽ S.(4), LECOMTE E.(5) & DE MONTMOLLIN G.(6)
ABSTRACT
The mouth of the Baye de Clarens torrent in Switzerland is currently constrained by lateral training walls, sequent sills
and a bridge with a low hydraulic capacity. Due to a bed load trap upstream, few sediments reach the mouth. To
improve flood protection and reestablish a natural dynamic mouth, a project of a delta with restored bed load was
designed. In order to ensure that this newly formed delta guarantees flood protection and results in a sustainable
sediment management, a physical model has been built at a scale of 1:25. Tests have been performed with several flood
hydrographs and corresponding bed load volumes. Two opening angles for the left training wall have been taken into
account for the delta evolution. For all cases tested, the newly formed delta does not hinder free flow. No significant
backwater effect could be observed. Deposition of sediments occurs on the block ramp at the end of floods, but these
deposits are quickly washed out at the beginning of each new flood.
File Size : 2,348,418 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Managing deltas
Date Published : 20/08/2015
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