Bedload transport: a walk between randomness and determinism. Part 1. The state of the art

This paper outlines the various approaches used to calculate bedload transport. As bedload transport exhibits considerable spatial and temporal variations, computing the bedload transport rates and morphological changes experienced by streambeds is difficult. A large body of experimental work has re...

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Bibliographic Details
Published in:Journal of hydraulic research Vol. 58; no. 1; pp. 1 - 17
Main Author: Ancey, Christophe
Format: Journal Article
Language:English
Published: Madrid Taylor & Francis 02.01.2020
Taylor & Francis Ltd
Subjects:
Bed forms
Bed load
Bedload transport
bedload transport rate
history of hydraulics
morphodynamics
Particle motion
random motion
Scaling
Scaling laws
Sediment transport
Sedimentary structures
Shear stress
stochastic model
Streambeds
Temporal variations
Transport
Transport processes
Water discharge
ISSN:0022-1686, 1814-2079
Online Access:Get full text
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Summary:This paper outlines the various approaches used to calculate bedload transport. As bedload transport exhibits considerable spatial and temporal variations, computing the bedload transport rates and morphological changes experienced by streambeds is difficult. A large body of experimental work has revealed scaling laws relating the mean transport rate to hydraulic conditions (that is, water discharge , bottom shear stress or stream power ω): , or . The most common approach used to calculate bedload transport has thus long involved determining the one-to-one function (or any other dependence of on or ω) from experiments or theoretical considerations. However, the predictive power of such relationships is limited: scientists are unable to predict to within better than one order of magnitude, and morphodynamic models based on fail to explain the development of bedforms without the use of additional assumptions. Progressively, other calculation approaches have appeared, with many relying on the idea that bedload transport is a macroscopic transport process that primarily reflects random particle motion at the grain scale. The present paper reviews the main ideas being explored today.
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ISSN:0022-1686
1814-2079
DOI:10.1080/00221686.2019.1702594