Impact of floodplain vegetation on morphological process in the straight compound open-channel

A numerical study

Sung-Uk Choi, Hyedeuk Bae

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The present paper introduces a numerical model that is capable of simulating the morphological change of a straight open-channel. The computational procedures take three steps, namely flow prediction, estimation of bedload, and building the new channel shape in response to the bedload transport. The one-dimensional depth-averaged equation, called the lateral distribution method, with vegetation drag term is used for flow prediction, and the vectorized formula proposed by Kovacs and Parker (1994) is used to estimate bedload. The Exner's equation is solved to predict the channel shape with the help of the sliding algorithm proposed by Menendez et al. (2008). First, the flow model is applied to a compound channel without vegetation on the floodplain. Then, non-dimensional eddy viscosity is calibrated for vegetated flows. Finally, the model is applied to a hypothetical compound channel with floodplain vegetation. The impacts of vegetation on the flow and morphological process are investigated and discussed.

Original languageEnglish
Title of host publication34th IAHR Congress 2011 - Balance and Uncertainty
Subtitle of host publicationWater in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering
PublisherInternational Association for Hydro-Environment Engineering and Research (IAHR)
Pages3427-3433
Number of pages7
ISBN (Electronic)9780858258686
Publication statusPublished - 2011 Jan 1
Event34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering - Brisbane, Australia
Duration: 2011 Jun 262011 Jul 1

Publication series

Name34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering

Conference

Conference34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering
CountryAustralia
CityBrisbane
Period11/6/2611/7/1

Fingerprint

floodplain
bedload
vegetation
Drag
Numerical models
prediction
drag
sliding
Viscosity
eddy
viscosity

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Water Science and Technology
  • Environmental Science (miscellaneous)

Cite this

Choi, S-U., & Bae, H. (2011). Impact of floodplain vegetation on morphological process in the straight compound open-channel: A numerical study. In 34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering (pp. 3427-3433). (34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering). International Association for Hydro-Environment Engineering and Research (IAHR).
Choi, Sung-Uk ; Bae, Hyedeuk. / Impact of floodplain vegetation on morphological process in the straight compound open-channel : A numerical study. 34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering. International Association for Hydro-Environment Engineering and Research (IAHR), 2011. pp. 3427-3433 (34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering).
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Choi, S-U & Bae, H 2011, Impact of floodplain vegetation on morphological process in the straight compound open-channel: A numerical study. in 34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering. 34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering, International Association for Hydro-Environment Engineering and Research (IAHR), pp. 3427-3433, 34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering, Brisbane, Australia, 11/6/26.

Impact of floodplain vegetation on morphological process in the straight compound open-channel : A numerical study. / Choi, Sung-Uk; Bae, Hyedeuk.

34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering. International Association for Hydro-Environment Engineering and Research (IAHR), 2011. p. 3427-3433 (34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - The present paper introduces a numerical model that is capable of simulating the morphological change of a straight open-channel. The computational procedures take three steps, namely flow prediction, estimation of bedload, and building the new channel shape in response to the bedload transport. The one-dimensional depth-averaged equation, called the lateral distribution method, with vegetation drag term is used for flow prediction, and the vectorized formula proposed by Kovacs and Parker (1994) is used to estimate bedload. The Exner's equation is solved to predict the channel shape with the help of the sliding algorithm proposed by Menendez et al. (2008). First, the flow model is applied to a compound channel without vegetation on the floodplain. Then, non-dimensional eddy viscosity is calibrated for vegetated flows. Finally, the model is applied to a hypothetical compound channel with floodplain vegetation. The impacts of vegetation on the flow and morphological process are investigated and discussed.

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M3 - Conference contribution

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Choi S-U, Bae H. Impact of floodplain vegetation on morphological process in the straight compound open-channel: A numerical study. In 34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering. International Association for Hydro-Environment Engineering and Research (IAHR). 2011. p. 3427-3433. (34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering).