Journal
ECOLOGICAL ENGINEERING
Volume 71, Issue -, Pages 1-9Publisher
ELSEVIER
DOI: 10.1016/j.ecoleng.2014.07.004
Keywords
Large woody debris; Flood water retention; Flow attenuation; Flow volume; Exceedance time; Field experiments
Funding
- administrative district of Erzgebirge (Department of the Environment)
- city of Olbernhau
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Large woody debris (LWD) is a natural component of watercourses. To prevent flood-related damage caused by LWD, trunks and big branches are removed from the channels during maintenance work, thus accelerating runoff and intensifying incision. However, the impact of in-channel LWD on flood waves is not adequately known. This project shows the results of experiments on the potential of LWD as an in-channel roughness element. LWD was installed and secured in a 282 m long channel of a first-order stream. Artificial flood waves with a return period of 3.5 years were generated, and the retention effect of the LWD was monitored. Results show a significant delaying of the flood wave progression and a distinctive shift of flow volume from high to low runoff coefficients, but only a low attenuation of peak discharge. The authors conclude that LWD plays an important role as an in-channel roughness element to decelerate runoff and increase water retention in the channel. (C) 2014 Elsevier B.V. All rights reserved.
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