Giovanni Coco

A Multiscale Approach to Shoreline Prediction

Publisher: American Geophysical Union (AGU)

Date: 11-01-2021

DOI: 10.1029/2020GL090587

Nearshore hydrodynamics, beachface cobble transport and morphodynamics on a Pacific atoll motu

Publisher: Elsevier BV

Date: 07-2017

DOI: 10.1016/J.MARGEO.2017.04.012

Observations of nearshore crescentic sandbars

Publisher: American Geophysical Union (AGU)

Date: 06-2004

DOI: 10.1029/2003JC002214

Statistical Description of Swash Motion on a Beach During Beach Cusp Formation

Publisher: American Society of Civil Engineers

Date: 06-09-2006

DOI: 10.1061/40855(214)106

The influence of turbulent bursting on sediment resuspension under fluvial unidirectional currents

Publisher: Copernicus GmbH

Date: 08-12-2016

DOI: 10.5194/ESURF-2016-60

Abstract: Abstract. Laboratory experiments were undertaken in a unidirectional current flume in order to examine the role of turbulence on incipient sediment motion. An acoustic Doppler velocimeter was used to measure the instantaneous three-dimensional velocity components and acoustic backscatter (related to suspended sediment concentration). The relationship between wall turbulence (in particular, the "bursting" phenomenon) and resuspension of a non-cohesive sediment bed was examined. The results within a range above and below the measured critical velocity suggested that: 1) the contribution of turbulent bursting events remained identical in both experimental conditions 2) ejection and sweep events contributed more to the total sediment flux than up-acceleration and down-deceleration events and 3) wavelet transform revealed a correlation between the momentum and sediment flux in both test conditions. Such similarities in conditions above and below the measured critical velocity highlighted the need to re-evaluate the accuracy of a single time-averaged critical velocity for the initiation of sediment entrainment.

Coupled and noncoupled behavior of three‐dimensional morphological patterns in a double sandbar system

Publisher: American Geophysical Union (AGU)

Date: 07-2007

DOI: 10.1029/2006JC003799

Video observations of beach cusp morphodynamics

Publisher: Elsevier BV

Date: 09-2008

DOI: 10.1016/J.MARGEO.2008.05.008

Storm-driven changes in rip channel patterns on an embayed beach

Publisher: Elsevier BV

Date: 04-2011

DOI: 10.1016/J.GEOMORPH.2010.12.014

The influence of turbulent bursting on sediment resuspension under unidirectional currents

Publisher: Copernicus GmbH

Date: 19-07-2017

DOI: 10.5194/ESURF-5-399-2017

Abstract: Abstract. Laboratory experiments were conducted in an open channel flume with a flat sandy bed to examine the role of turbulence on sediment resuspension. An acoustic Doppler velocimeter (ADV) was used to measure the instantaneous three-dimensional velocity components and acoustic backscatter as a proxy to suspended sediment concentration. Estimates of sediment transport assume that there is a mean critical velocity that needs to be exceeded before sediment transport is initiated. This approach does not consider the turbulent flow field that may initiate sediment resuspension through event-based processes such as the bursting phenomenon. In this paper, laboratory measurements were used to examine the sediment resuspension processes below and above the mean critical velocity. The results within a range above and below the measured mean critical velocity suggested that (1) the contribution of turbulent bursting events remained identical in both experimental conditions, (2) ejection and sweep events contributed more to the total sediment flux than up-acceleration and down-deceleration events, and (3) wavelet transform revealed a correlation between the momentum and sediment flux in both test conditions. Such similarities in conditions above and below the measured mean critical velocity highlight the need to re-evaluate the accuracy of a single time-averaged mean critical velocity for the initiation of sediment entrainment.

The University Of Auckland

Location: New Zealand

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Discovery Projects - Grant ID: DP220101125

Start Date: 06-2022

End Date: 06-2025

Amount: $524,000.00

Funder: Australian Research Council

Discovery Projects - Grant ID: DP200100134

Start Date: 10-2020

End Date: 09-2025

Amount: $370,000.00

Funder: Australian Research Council