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Dynamic adjustments in bankfull width of a braided reach

Dynamic adjustments in bankfull width of a braided reach
Dynamic adjustments in bankfull width of a braided reach

Remarkable channel degradation has occurred in a braided reach of the Lower Yellow River owing to the recent operation of Xiaolangdi reservoir, and downstream progressive incision has caused a significant process of channel widening. For the 104 km long braided reach, the dynamic adjustments in bankfull channel widths were investigated at both the section scale and reach scale, based on post-flood cross-sectional profiles surveyed annually from 1999 to 2013. It was found that the bankfull width at one section increased by up to 2887 m (296% increase) over 14 years, with an increase in the reach-scale bankfull width of 666 m (59% increase) in the braided reach. Fluvial erosion intensity was identified as a key factor influencing the variation in bankfull width, based on a comparison of various fluvial and non-fluvial factors controlling channel widening. Empirical relationships were developed, in the form of simple power functions, between these bankfull widths and the previous four-year average fluvial erosion intensity during flood seasons at the hydrometric station of Huayuankou. It is concluded that the significant increase in bankfull width was prominent in the channel evolution of the braided reach, which resulted in a major loss of floodplains.

geology, Hydrology & water resourceriver engineering
1741-7589
207-216
Xia, Junqiang
f5f6bd2c-9e99-4d18-8c77-ebfa85e23433
Zhou, Meirong
78773bca-9c26-4c39-8d43-f865feed8960
Li, Jie
6506aa74-64d1-4c5f-ac5c-875791c687ff
Zhang, Xiaolei
dc316297-4466-4b52-b384-05e840738b4e
Carling, Paul A.
8d252dd9-3c88-4803-81cc-c2ec4c6fa687
Xia, Junqiang
f5f6bd2c-9e99-4d18-8c77-ebfa85e23433
Zhou, Meirong
78773bca-9c26-4c39-8d43-f865feed8960
Li, Jie
6506aa74-64d1-4c5f-ac5c-875791c687ff
Zhang, Xiaolei
dc316297-4466-4b52-b384-05e840738b4e
Carling, Paul A.
8d252dd9-3c88-4803-81cc-c2ec4c6fa687

Xia, Junqiang, Zhou, Meirong, Li, Jie, Zhang, Xiaolei and Carling, Paul A. (2019) Dynamic adjustments in bankfull width of a braided reach. Proceedings of the Institution of Civil Engineers: Water Management, 172 (4), 207-216. (doi:10.1680/jwama.17.00043).

Record type: Article

Abstract

Remarkable channel degradation has occurred in a braided reach of the Lower Yellow River owing to the recent operation of Xiaolangdi reservoir, and downstream progressive incision has caused a significant process of channel widening. For the 104 km long braided reach, the dynamic adjustments in bankfull channel widths were investigated at both the section scale and reach scale, based on post-flood cross-sectional profiles surveyed annually from 1999 to 2013. It was found that the bankfull width at one section increased by up to 2887 m (296% increase) over 14 years, with an increase in the reach-scale bankfull width of 666 m (59% increase) in the braided reach. Fluvial erosion intensity was identified as a key factor influencing the variation in bankfull width, based on a comparison of various fluvial and non-fluvial factors controlling channel widening. Empirical relationships were developed, in the form of simple power functions, between these bankfull widths and the previous four-year average fluvial erosion intensity during flood seasons at the hydrometric station of Huayuankou. It is concluded that the significant increase in bankfull width was prominent in the channel evolution of the braided reach, which resulted in a major loss of floodplains.

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More information

Accepted/In Press date: 27 November 2017
e-pub ahead of print date: 2 January 2018
Published date: 1 August 2019
Keywords: geology, Hydrology & water resourceriver engineering

Identifiers

Local EPrints ID: 433260
URI: http://eprints.soton.ac.uk/id/eprint/433260
ISSN: 1741-7589
PURE UUID: 7764c9f8-e907-4c5a-ada1-541eb4213162

Catalogue record

Date deposited: 12 Aug 2019 16:30
Last modified: 09 Nov 2021 15:52

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Contributors

Author: Junqiang Xia
Author: Meirong Zhou
Author: Jie Li
Author: Xiaolei Zhang
Author: Paul A. Carling

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