The University of Southampton
University of Southampton Institutional Repository

Cross-shore suspended sand and bed load transport on beaches

Cross-shore suspended sand and bed load transport on beaches
Cross-shore suspended sand and bed load transport on beaches
Simple formulas are developed to predict the time-averaged rates of cross-shore suspended sand and bed load transport. The net suspended sand transport rate is expressed as the product of the depth-averaged current and the suspended sediment volume per unit bottom area with a reduction factor that accounts for the correlation between the time-varying fluid velocity and sediment concentration. The net bed load transport rate under nonlinear waves is assumed to be onshore and proportional to ?U3 where ?U is the standard deviation of the horizontal velocity. The probabilities of sediment movement and suspension are introduced to account for the initiation of sediment movement and suspension. Simple functions are proposed to account for the effects of a steep bottom slope on the bed load and suspended sediment transport rates. The proposed formulas are found to be in agreement with three data sets within a factor of about 2. The proposed formulas are shown to be consistent with existing simple formulas. The formulas are incorporated into a time-averaged wave model and the continuity equation of bottom sediment to predict the beach profile evolution. The numerical model is compared with seven small-scale tests including berm erosion tests and seven large-scale tests including dune erosion tests. The numerical model predicts the overall beach profile evolution including the berm and dune erosion but does not always predict the fairly subtle profile changes including bar migration accurately.
0148-0227
Kobayashi, Nobuhisa
3fe27828-b0c1-43c1-9fd6-6a973d3bc72e
Payo, A
755309ea-3c8a-4461-a533-d2fe25121d83
Schmied, Lauren
f1ca3579-70c3-49ac-b054-ce3295ac71ff
Kobayashi, Nobuhisa
3fe27828-b0c1-43c1-9fd6-6a973d3bc72e
Payo, A
755309ea-3c8a-4461-a533-d2fe25121d83
Schmied, Lauren
f1ca3579-70c3-49ac-b054-ce3295ac71ff

Kobayashi, Nobuhisa, Payo, A and Schmied, Lauren (2008) Cross-shore suspended sand and bed load transport on beaches. Journal of Geophysical Research, 113 (C7). (doi:10.1029/2007JC004203).

Record type: Article

Abstract

Simple formulas are developed to predict the time-averaged rates of cross-shore suspended sand and bed load transport. The net suspended sand transport rate is expressed as the product of the depth-averaged current and the suspended sediment volume per unit bottom area with a reduction factor that accounts for the correlation between the time-varying fluid velocity and sediment concentration. The net bed load transport rate under nonlinear waves is assumed to be onshore and proportional to ?U3 where ?U is the standard deviation of the horizontal velocity. The probabilities of sediment movement and suspension are introduced to account for the initiation of sediment movement and suspension. Simple functions are proposed to account for the effects of a steep bottom slope on the bed load and suspended sediment transport rates. The proposed formulas are found to be in agreement with three data sets within a factor of about 2. The proposed formulas are shown to be consistent with existing simple formulas. The formulas are incorporated into a time-averaged wave model and the continuity equation of bottom sediment to predict the beach profile evolution. The numerical model is compared with seven small-scale tests including berm erosion tests and seven large-scale tests including dune erosion tests. The numerical model predicts the overall beach profile evolution including the berm and dune erosion but does not always predict the fairly subtle profile changes including bar migration accurately.

Text
jgrc10689.pdf - Accepted Manuscript
Download (835kB)

More information

Published date: 1 July 2008
Organisations: Energy & Climate Change Group

Identifiers

Local EPrints ID: 381827
URI: http://eprints.soton.ac.uk/id/eprint/381827
ISSN: 0148-0227
PURE UUID: bc7921f4-df28-4e4d-b16a-ab6510c4ae12

Catalogue record

Date deposited: 13 Oct 2015 16:02
Last modified: 18 Nov 2019 20:18

Export record

Altmetrics

Contributors

Author: Nobuhisa Kobayashi
Author: A Payo
Author: Lauren Schmied

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×