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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Floodplain influences on sediment dynamics of the urban creek
Floodplain influences on sediment dynamics of the urban creek
Author : S. AHILAN(1), M. GUAN(1), N.G. WRIGHT(1) & P.A. SLEIGH(1)
ABSTRACT
This study explores the influence of floodplains on the sediment dynamics of Johnson Creek, a highly urbanised stream
known for frequent flooding and which contains sections that do not meet water quality standards under the U.S. Federal
Clean Water Act. The study area is focused on the downstream of Johnson Creek, the East Lent reach, where the bank of
the creek has been reconfigured to reconnect the river to a restored floodplain on a 28-ha site to provide more space for
the river to flow and be stored. The aim of this study is to investigate whether sediments from the watershed accumulate in
the restored floodplain over a period of time or flushes out to the main Willamette River. A two dimensional hydromorphodynamic
model has been adopted for the study region, which models suspended load sediment dynamics between
the main channel and the floodplain. Simulation results indicate that about 30% sediment generated from the upstream
deposited in the East Lents floodplain. As pollutants from the industries and agriculture lands are generally attached to
the sediments, this can lead to serious long term health implications. Furthermore, sediment aggradation in the floodplain
over a period of time can reduce the storage capacity of the flood basin.
File Size : 982,134 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 17/08/2015
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