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Displacement characteristics of coarse fluvial bed sediment

Displacement characteristics of coarse fluvial bed sediment
Displacement characteristics of coarse fluvial bed sediment
[1] Previous work highlights the need for data collection to identify appropriate models for temporal evolution of tracer dispersal in rivers. Results of 64 gravel-bed field tracer experiments covering a wide range of flow and sediment supply regimes are compiled here to determine the probabilistic character of gravel transport. We focus on whether particle travel distances and waits are thin- or heavy-tailed. While heavy-tailed travel distance distributions are observed between successive monitoring events in different hydrological and sediment supply regimes, heavy-tailedness does not persist through total travel distance over multiple monitoring events, suggesting that individual monitoring events occur before particle travel distance exceeds the characteristic correlation length for the channel (such that particles that start in fast paths remain in fast paths and particles in slow paths remain in slow paths). After a large number of transport events, super-diffusive spreading was not observed at any of the gravel bed streams. Continuous-time tracking of x, y, z coordinates of tracers in natural streams is necessary to capture exact step and waiting time distributions.
2169-9011
155-165
Hassan, Marwan A.
8a357cce-b94e-4d0a-a04e-ec18482c72a9
Voepel, Hal
7330972a-c61c-4058-b52c-3669fadfcf70
Schumer, Rina
57f38ba2-9732-4f50-8604-0758d3b816dc
Parker, Gary
ba61d7e0-5277-4619-bb2b-891c676b1771
Fraccarollo, Luigi
90f24774-e7aa-4e45-b149-07edad395c00
Hassan, Marwan A.
8a357cce-b94e-4d0a-a04e-ec18482c72a9
Voepel, Hal
7330972a-c61c-4058-b52c-3669fadfcf70
Schumer, Rina
57f38ba2-9732-4f50-8604-0758d3b816dc
Parker, Gary
ba61d7e0-5277-4619-bb2b-891c676b1771
Fraccarollo, Luigi
90f24774-e7aa-4e45-b149-07edad395c00

Hassan, Marwan A., Voepel, Hal, Schumer, Rina, Parker, Gary and Fraccarollo, Luigi (2013) Displacement characteristics of coarse fluvial bed sediment. Journal of Geophysical Research: Earth Surface, 118 (1), 155-165. (doi:10.1029/2012JF002374).

Record type: Article

Abstract

[1] Previous work highlights the need for data collection to identify appropriate models for temporal evolution of tracer dispersal in rivers. Results of 64 gravel-bed field tracer experiments covering a wide range of flow and sediment supply regimes are compiled here to determine the probabilistic character of gravel transport. We focus on whether particle travel distances and waits are thin- or heavy-tailed. While heavy-tailed travel distance distributions are observed between successive monitoring events in different hydrological and sediment supply regimes, heavy-tailedness does not persist through total travel distance over multiple monitoring events, suggesting that individual monitoring events occur before particle travel distance exceeds the characteristic correlation length for the channel (such that particles that start in fast paths remain in fast paths and particles in slow paths remain in slow paths). After a large number of transport events, super-diffusive spreading was not observed at any of the gravel bed streams. Continuous-time tracking of x, y, z coordinates of tracers in natural streams is necessary to capture exact step and waiting time distributions.

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More information

Accepted/In Press date: 3 December 2012
e-pub ahead of print date: 25 February 2013
Published date: March 2013
Organisations: Geography & Environment

Identifiers

Local EPrints ID: 394162
URI: https://eprints.soton.ac.uk/id/eprint/394162
ISSN: 2169-9011
PURE UUID: d034e09b-0f5c-4e11-b620-c3654ce76ee8

Catalogue record

Date deposited: 11 May 2016 11:24
Last modified: 20 Nov 2017 17:33

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