IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Flood risk management and adaptation : Backwater rise due to driftwood accumulations
Backwater rise due to driftwood accumulations
Author : LUKAS SCHMOCKER(1), DIETER BRÄNDLI(2), VOLKER WEITBRECHT(3) & ROBERT M. BOES(4)
ABSTRACT
During flood events mountain torrents and rivers may transport significant amounts of driftwood or large woody debris
(LWD). This driftwood can accumulate and block spillways at hydropower plants as well as bridges and weirs along rivers.
Blocking of a river cross section will always lead to a backwater rise and possible overtopping of the flood embankment.
Furthermore, also manmade driftwood retention structures such as debris racks result in a backwater rise, once they start
to retain driftwood. For both cases, it is of primary importance to quantify the resulting backwater rise. The present paper
summarizes a series of laboratory tests, where the backwater rise due to a driftwood accumulation at a rack or bridge was
investigated. The backwater rise was determined depending on various flow conditions and for different driftwood
characteristics. The results highlight the decisive effect of the Froude number and the porosity of the driftwood
accumulation on the backwater rise.
File Size : 3,227,313 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Flood risk management and adaptation
Date Published : 18/08/2015
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