Quantifying dispersion in an estuary

A Lagrangian drifter approach

D. Spencer, C. J. Lemckert, Y. Yu, Johann Gustafson, S. Y. Lee, Hong Zhang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Describing the physical drivers of water bodies plays an integral role in the marine environment. Lagrangian drifters are used to describe hydrodynamics, where tracking groups (clusters) of drifting floats is performed to determine the dispersion behaviour in the water. Using two types of Lagrangian drifters released in Moreton Bay, Australia, the dispersion behaviour is determined over the duration of a semi-diurnal spring tide cycle. A Self-Locating Datum Marker Buoy (SLDMB) was designed as the first drifter type. The second drifter (Small Drifter) was designed to be approximately half the size of the SLDMB. SLDMB and Small Drifter clusters were deployed for approximately 16hrs and 9-12hrs, respectively. Their trajectories and dispersion were influenced by the oscillating tidal current during the course of the drifter deployment, as well as fluctuating wind speed and direction. The Small Drifters exhibited a higher degree of dispersion than the SLDMBs; illustrating that the different drifter design had a significant impact on their susceptibility to wind induced shear dispersion-a consideration that all drogue based studies need to consider when interpreting results. A MIKE 3 model was used to assist with the investigation at hand using a dispersion coefficient of 0.2m2/s. The model required further adjustments with respect to tidal forcing and bathymetry resolution in order to enhance dispersion simulation.

Original languageEnglish
Pages (from-to)29-34
Number of pages6
JournalJournal of Coastal Research
Volume70
DOIs
Publication statusPublished - 1 Apr 2014
Externally publishedYes

Fingerprint

drifter
estuary
tidal cycle
tidal current
bathymetry
wind direction
marine environment
wind velocity
hydrodynamics
trajectory

Cite this

Spencer, D. ; Lemckert, C. J. ; Yu, Y. ; Gustafson, Johann ; Lee, S. Y. ; Zhang, Hong. / Quantifying dispersion in an estuary : A Lagrangian drifter approach. In: Journal of Coastal Research. 2014 ; Vol. 70. pp. 29-34.
@article{8521d9031b444b1d9e5dd68e410eff4b,
title = "Quantifying dispersion in an estuary: A Lagrangian drifter approach",
abstract = "Describing the physical drivers of water bodies plays an integral role in the marine environment. Lagrangian drifters are used to describe hydrodynamics, where tracking groups (clusters) of drifting floats is performed to determine the dispersion behaviour in the water. Using two types of Lagrangian drifters released in Moreton Bay, Australia, the dispersion behaviour is determined over the duration of a semi-diurnal spring tide cycle. A Self-Locating Datum Marker Buoy (SLDMB) was designed as the first drifter type. The second drifter (Small Drifter) was designed to be approximately half the size of the SLDMB. SLDMB and Small Drifter clusters were deployed for approximately 16hrs and 9-12hrs, respectively. Their trajectories and dispersion were influenced by the oscillating tidal current during the course of the drifter deployment, as well as fluctuating wind speed and direction. The Small Drifters exhibited a higher degree of dispersion than the SLDMBs; illustrating that the different drifter design had a significant impact on their susceptibility to wind induced shear dispersion-a consideration that all drogue based studies need to consider when interpreting results. A MIKE 3 model was used to assist with the investigation at hand using a dispersion coefficient of 0.2m2/s. The model required further adjustments with respect to tidal forcing and bathymetry resolution in order to enhance dispersion simulation.",
keywords = "dispersion, estuary, Lagrangian drifter, SLDMB",
author = "D. Spencer and Lemckert, {C. J.} and Y. Yu and Johann Gustafson and Lee, {S. Y.} and Hong Zhang",
year = "2014",
month = "4",
day = "1",
doi = "10.2112/SI70-006.1",
language = "English",
volume = "70",
pages = "29--34",
journal = "Journal of Coastal Research",
issn = "0749-0208",
publisher = "Coastal Education Research Foundation (CERF)",

}

Quantifying dispersion in an estuary : A Lagrangian drifter approach. / Spencer, D.; Lemckert, C. J.; Yu, Y.; Gustafson, Johann; Lee, S. Y.; Zhang, Hong.

In: Journal of Coastal Research, Vol. 70, 01.04.2014, p. 29-34.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Quantifying dispersion in an estuary

T2 - A Lagrangian drifter approach

AU - Spencer, D.

AU - Lemckert, C. J.

AU - Yu, Y.

AU - Gustafson, Johann

AU - Lee, S. Y.

AU - Zhang, Hong

PY - 2014/4/1

Y1 - 2014/4/1

N2 - Describing the physical drivers of water bodies plays an integral role in the marine environment. Lagrangian drifters are used to describe hydrodynamics, where tracking groups (clusters) of drifting floats is performed to determine the dispersion behaviour in the water. Using two types of Lagrangian drifters released in Moreton Bay, Australia, the dispersion behaviour is determined over the duration of a semi-diurnal spring tide cycle. A Self-Locating Datum Marker Buoy (SLDMB) was designed as the first drifter type. The second drifter (Small Drifter) was designed to be approximately half the size of the SLDMB. SLDMB and Small Drifter clusters were deployed for approximately 16hrs and 9-12hrs, respectively. Their trajectories and dispersion were influenced by the oscillating tidal current during the course of the drifter deployment, as well as fluctuating wind speed and direction. The Small Drifters exhibited a higher degree of dispersion than the SLDMBs; illustrating that the different drifter design had a significant impact on their susceptibility to wind induced shear dispersion-a consideration that all drogue based studies need to consider when interpreting results. A MIKE 3 model was used to assist with the investigation at hand using a dispersion coefficient of 0.2m2/s. The model required further adjustments with respect to tidal forcing and bathymetry resolution in order to enhance dispersion simulation.

AB - Describing the physical drivers of water bodies plays an integral role in the marine environment. Lagrangian drifters are used to describe hydrodynamics, where tracking groups (clusters) of drifting floats is performed to determine the dispersion behaviour in the water. Using two types of Lagrangian drifters released in Moreton Bay, Australia, the dispersion behaviour is determined over the duration of a semi-diurnal spring tide cycle. A Self-Locating Datum Marker Buoy (SLDMB) was designed as the first drifter type. The second drifter (Small Drifter) was designed to be approximately half the size of the SLDMB. SLDMB and Small Drifter clusters were deployed for approximately 16hrs and 9-12hrs, respectively. Their trajectories and dispersion were influenced by the oscillating tidal current during the course of the drifter deployment, as well as fluctuating wind speed and direction. The Small Drifters exhibited a higher degree of dispersion than the SLDMBs; illustrating that the different drifter design had a significant impact on their susceptibility to wind induced shear dispersion-a consideration that all drogue based studies need to consider when interpreting results. A MIKE 3 model was used to assist with the investigation at hand using a dispersion coefficient of 0.2m2/s. The model required further adjustments with respect to tidal forcing and bathymetry resolution in order to enhance dispersion simulation.

KW - dispersion

KW - estuary

KW - Lagrangian drifter

KW - SLDMB

UR - http://www.scopus.com/inward/record.url?scp=84910629087&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/quantifying-dispersion-estuary-lagrangian-drifter-approach

U2 - 10.2112/SI70-006.1

DO - 10.2112/SI70-006.1

M3 - Article

VL - 70

SP - 29

EP - 34

JO - Journal of Coastal Research

JF - Journal of Coastal Research

SN - 0749-0208

ER -