River improvement techniques for mitigating river bed degradation and channel width reduction in the sandy Hii River where sediment transport occurs at normal times

River improvement techniques for mitigating river bed degradation and channel width reduction in the sandy Hii River where sediment transport occurs at normal times

In the sandy Hii River, a large amount of sediment yield from upper river basin had brought developments of braided channels covered with sand waves. In the braided channels, sediment materials on the river beds are capable to move in normal discharge conditions. In recent years, however, the sedime...

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Main Authors: Gotoh Takahisa, Fukuoka Shoji
Format: Article
Language:English
Published: EDP Sciences 2018-01-01
Series:E3S Web of Conferences
Online Access:https://doi.org/10.1051/e3sconf/20184002033
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spelling doaj-aafe2ac4fff64ed3acaf8247a6155d5c2021-02-02T08:13:48ZengEDP SciencesE3S Web of Conferences2267-12422018-01-01400203310.1051/e3sconf/20184002033e3sconf_riverflow2018_02033River improvement techniques for mitigating river bed degradation and channel width reduction in the sandy Hii River where sediment transport occurs at normal timesGotoh TakahisaFukuoka ShojiIn the sandy Hii River, a large amount of sediment yield from upper river basin had brought developments of braided channels covered with sand waves. In the braided channels, sediment materials on the river beds are capable to move in normal discharge conditions. In recent years, however, the sediment yield decreases due to constructions of check dams and ground sills in the upper river basin. Thus, the river beds downstream of the ground sill have gradually degraded and the main channel widths have been narrowed with the progressing bed degradation. Firstly, we clarified that the effects of non-equilibrium sediment transports around the ground sill during normal discharge conditions on the bed degradation and the channel width reduction by using annual observed data and numerical simulations for bed variations. In addition, we provided the river improvement techniques for mitigating bed degradation and channel width reduction by improving state of non-equilibrium sediment transports passing through the ground sill.https://doi.org/10.1051/e3sconf/20184002033
collection DOAJ
language English
format Article
sources DOAJ
author Gotoh Takahisa
Fukuoka Shoji
spellingShingle Gotoh Takahisa
Fukuoka Shoji
River improvement techniques for mitigating river bed degradation and channel width reduction in the sandy Hii River where sediment transport occurs at normal times
E3S Web of Conferences
author_facet Gotoh Takahisa
Fukuoka Shoji
author_sort Gotoh Takahisa
title River improvement techniques for mitigating river bed degradation and channel width reduction in the sandy Hii River where sediment transport occurs at normal times
title_short River improvement techniques for mitigating river bed degradation and channel width reduction in the sandy Hii River where sediment transport occurs at normal times
title_full River improvement techniques for mitigating river bed degradation and channel width reduction in the sandy Hii River where sediment transport occurs at normal times
title_fullStr River improvement techniques for mitigating river bed degradation and channel width reduction in the sandy Hii River where sediment transport occurs at normal times
title_full_unstemmed River improvement techniques for mitigating river bed degradation and channel width reduction in the sandy Hii River where sediment transport occurs at normal times
title_sort river improvement techniques for mitigating river bed degradation and channel width reduction in the sandy hii river where sediment transport occurs at normal times
publisher EDP Sciences
series E3S Web of Conferences
issn 2267-1242
publishDate 2018-01-01
description In the sandy Hii River, a large amount of sediment yield from upper river basin had brought developments of braided channels covered with sand waves. In the braided channels, sediment materials on the river beds are capable to move in normal discharge conditions. In recent years, however, the sediment yield decreases due to constructions of check dams and ground sills in the upper river basin. Thus, the river beds downstream of the ground sill have gradually degraded and the main channel widths have been narrowed with the progressing bed degradation. Firstly, we clarified that the effects of non-equilibrium sediment transports around the ground sill during normal discharge conditions on the bed degradation and the channel width reduction by using annual observed data and numerical simulations for bed variations. In addition, we provided the river improvement techniques for mitigating bed degradation and channel width reduction by improving state of non-equilibrium sediment transports passing through the ground sill.
url https://doi.org/10.1051/e3sconf/20184002033
work_keys_str_mv AT gotohtakahisa riverimprovementtechniquesformitigatingriverbeddegradationandchannelwidthreductioninthesandyhiiriverwheresedimenttransportoccursatnormaltimes
AT fukuokashoji riverimprovementtechniquesformitigatingriverbeddegradationandchannelwidthreductioninthesandyhiiriverwheresedimenttransportoccursatnormaltimes
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