Do cutoffs on pristine meandering rivers tend to be more upstream-skewed than the main channel?

Xingyan Guo, Dong Chen, Gary Parker

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

Abstract

Meander bends are rarely symmetric in the streamwise direction. Instead, they tend to show a preferred skewing, with the apex either pointing upstream (upstream-skewed) or downstream (downstream-skewed). There are theoretical reasons for both planform morphologies, and both can be seen in the field. Here we focus on skewing in cutoffs versus skewing in the main channel bends, and consider reaches that generally display neck cutoffs rather than chute cutoffs. In order to avoid the effects of human interference, we have selected five natural reaches, from various places around the world, which are in remote locations with negligible engineering works. We use Landsat images and Google Earth Pro to extract planform data for our study reaches. In total, 936 channel bends and 144 cutoffs have been evaluated. The percentage upstream skewed (PUS) among bends and cutoffs is estimated as 50.8% and 84.4%, respectively. The results indicate that while upstream- and downstream-skewed bends are found with nearly equal frequency in freely meandering channels, single-bend cutoff loops are strongly biased toward upstream-skewing.

Original languageEnglish (US)
Title of host publicationWorld Environmental and Water Resources Congress 2019
Subtitle of host publicationHydraulics, Waterways, and Water Distribution Systems Analysis - Selected Papers from the World Environmental and Water Resources Congress 2019
EditorsGregory F. Scott, William Hamilton
PublisherAmerican Society of Civil Engineers
Pages221-228
Number of pages8
ISBN (Electronic)9780784482353
DOIs
StatePublished - Jan 1 2019
Event19th World Environmental and Water Resources Congress 2019: Hydraulics, Waterways, and Water Distribution Systems Analysis - Pittsburgh, United States
Duration: May 19 2019May 23 2019

Publication series

NameWorld Environmental and Water Resources Congress 2019: Hydraulics, Waterways, and Water Distribution Systems Analysis - Selected Papers from the World Environmental and Water Resources Congress 2019

Conference

Conference19th World Environmental and Water Resources Congress 2019: Hydraulics, Waterways, and Water Distribution Systems Analysis
CountryUnited States
CityPittsburgh
Period5/19/195/23/19

ASJC Scopus subject areas

  • Water Science and Technology

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