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Controls of sediment burial depth and distribution on a small gravel bed channel Xing, Tianqi
Abstract
This study utilizes tracer data spanning a 12-year period from a small gravel-bed stream to investigate sediment burial depth and distribution in relation to key controls, including flow shearing work (expressed as time-integrated excess flow energy expenditure, ΩT), bedload grain size, and channel morphology. Higher ΩT leads to increased vertical mixing, especially among moved tracers, which tend to fit exponential and Gamma distributions, with the distribution shape is influenced by ΩT . Tracers with smaller grain sizes exhibit deeper and more dispersed burial, while coarser materials tend to concentrate near the bed surface. The central tendency of burial depth shows a notable negative correlation with grain size, particularly in larger size classes. Bed morphology doesn’t strongly impact the average burial depth, but it does cause different burial patterns. Deeper sediment burial is found in sidebars and pools, suggesting different levels of vertical mixing. Results of this study allow for the description of the role of flow, bed material grain size, and bed morphology on vertical sediment dispersion in a low sediment transport regime channel. Generalizing these findings requires further analysis in diverse fluvial systems. Any extrapolation requires a careful and justified scaling approach, acknowledging the study’s site-specific nature.
Item Metadata
Title |
Controls of sediment burial depth and distribution on a small gravel bed channel
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Creator | |
Supervisor | |
Publisher |
University of British Columbia
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Date Issued |
2024
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Description |
This study utilizes tracer data spanning a 12-year period from a small gravel-bed stream to investigate sediment burial depth and distribution in relation to key controls, including flow shearing work (expressed as time-integrated excess flow energy expenditure, ΩT), bedload grain size, and channel morphology. Higher ΩT leads to increased vertical mixing, especially among moved tracers, which tend to fit exponential and Gamma distributions, with the distribution shape is influenced by ΩT . Tracers with smaller grain sizes exhibit deeper and more dispersed burial, while coarser materials tend to concentrate near the bed surface. The central tendency of burial depth shows a notable negative correlation with grain size, particularly in larger size classes. Bed morphology doesn’t strongly impact the average burial depth, but it does cause different burial patterns. Deeper sediment burial is found in sidebars and pools, suggesting different levels of vertical mixing. Results of this study allow for the description of the role of flow, bed material grain size, and bed morphology on vertical sediment dispersion in a low sediment transport regime channel. Generalizing these findings requires further analysis in diverse fluvial systems. Any extrapolation requires a careful and justified scaling approach, acknowledging the study’s site-specific nature.
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Genre | |
Type | |
Language |
eng
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Date Available |
2024-03-07
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0440643
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2024-05
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Campus | |
Scholarly Level |
Graduate
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Rights URI | |
Aggregated Source Repository |
DSpace
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Rights
Attribution-NonCommercial-NoDerivatives 4.0 International