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  • 1
    Online Resource
    Online Resource
    The Inner-Shelf Dynamics Experiment
    American Meteorological Society ; 2021
    In:  Bulletin of the American Meteorological Society Vol. 102, No. 5 ( 2021-05), p. E1033-E1063
    Details
    In: Bulletin of the American Meteorological Society, American Meteorological Society, Vol. 102, No. 5 ( 2021-05), p. E1033-E1063
    Abstract: The inner shelf, the transition zone between the surfzone and the midshelf, is a dynamically complex region with the evolution of circulation and stratification driven by multiple physical processes. Cross-shelf exchange through the inner shelf has important implications for coastal water quality, ecological connectivity, and lateral movement of sediment and heat. The Inner-Shelf Dynamics Experiment (ISDE) was an intensive, coordinated, multi-institution field experiment from September–October 2017, conducted from the midshelf, through the inner shelf, and into the surfzone near Point Sal, California. Satellite, airborne, shore- and ship-based remote sensing, in-water moorings and ship-based sampling, and numerical ocean circulation models forced by winds, waves, and tides were used to investigate the dynamics governing the circulation and transport in the inner shelf and the role of coastline variability on regional circulation dynamics. Here, the following physical processes are highlighted: internal wave dynamics from the midshelf to the inner shelf; flow separation and eddy shedding off Point Sal; offshore ejection of surfzone waters from rip currents; and wind-driven subtidal circulation dynamics. The extensive dataset from ISDE allows for unprecedented investigations into the role of physical processes in creating spatial heterogeneity, and nonlinear interactions between various inner-shelf physical processes. Overall, the highly spatially and temporally resolved oceanographic measurements and numerical simulations of ISDE provide a central framework for studies exploring this complex and fascinating region of the ocean.
    Type of Medium: Online Resource
    ISSN: 0003-0007 , 1520-0477
    URL: Article
    DOI: 10.1175/BAMS-D-19-0281.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2021
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  • 2
    Online Resource
    Online Resource
    Inhomogeneous Turbulent Dispersion across the Nearshore Induced by Surfzone Eddies
    American Meteorological Society ; 2019
    In:  Journal of Physical Oceanography Vol. 49, No. 4 ( 2019-04), p. 1015-1034
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 49, No. 4 ( 2019-04), p. 1015-1034
    Abstract: In various oceanic regions, drifter-derived diffusivities reach a temporal maximum and subsequently decrease. Often, these are regions of inhomogeneous eddies, however, the effect of inhomogeneous turbulence on dispersion is poorly understood. The nearshore region (spanning from the surfzone to the inner shelf) also has strong cross-shore inhomogeneous turbulence. Nearshore Lagrangian statistics are estimated from drifter trajectories simulated with a wave-resolving two-dimensional Boussinesq model with random, normally incident, and directionally spread waves. The simulation is idealized and does not include other (wind, tidal, Coriolis) processes. The eddy field cross-shore inhomogeneity affects both the mean cross-shore drift and cross- and alongshore diffusivities. Short-time diffusivities are locally ballistic, and the mean drift is toward the eddy velocity variance maximum. The diffusivities reach a maximum and subsequently decrease, that is, are subdiffusive. The diffusivity maximum and time to maximum are parameterized taking into account the eddy field inhomogeneity. At long times, the cross- and alongshore diffusivities scale as t −1/2 and t −1/4 , respectively, which is related to the offshore decay of the eddy intensity. A diffusion equation, with a space-dependent Fickian diffusivity related to the eddy velocity variance, reproduced the short-, intermediate-, and long-time behavior of the mean drift and cross-shore diffusivity. The small Middleton parameter, indicating fixed float dispersion, suggests the Eulerian time scale can parameterize the Lagrangian time scale in this region. Although this idealized simulation had no mean currents, and thus no shear dispersion or mixing suppression, inhomogeneous turbulence effects may be relevant in other regions such as the Antarctic Circumpolar Current (ACC) and western boundary current extensions.
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/JPO-D-18-0102.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2019
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  • 3
    Online Resource
    Online Resource
    Relating Lagrangian and Eulerian horizontal eddy statistics in the surfzone
    American Geophysical Union (AGU) ; 2014
    In:  Journal of Geophysical Research: Oceans Vol. 119, No. 2 ( 2014-02), p. 1022-1037
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 119, No. 2 ( 2014-02), p. 1022-1037
    Abstract: Drifters and current meters sample the same surfzone eddies Surfzone Eulerian and Lagrangian statistics are related by theory Surfzone particle dynamics are explored
    Type of Medium: Online Resource
    ISSN: 2169-9275 , 2169-9291
    URL: Issue
    URL: Article
    DOI: 10.1002/jgrc.v119.2
    DOI: 10.1002/2013JC009415
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2014
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  • 4
    Online Resource
    Online Resource
    A Lagrangian stochastic model of surf zone drifter dispersion : MODELING SURF ZONE DISPERSION
    American Geophysical Union (AGU) ; 2012
    In:  Journal of Geophysical Research: Oceans Vol. 117, No. C3 ( 2012-03), p. n/a-n/a
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 117, No. C3 ( 2012-03), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2011JC007701
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2012
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    detail.hit.zdb_id: 3094268-8
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    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 5
    Online Resource
    Online Resource
    Observations of drifter dispersion in the surfzone: The effect of sheared alongshore currents
    American Geophysical Union (AGU) ; 2009
    In:  Journal of Geophysical Research Vol. 114, No. C7 ( 2009-07-31)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 114, No. C7 ( 2009-07-31)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2009JC005328
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2009
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    detail.hit.zdb_id: 3094104-0
    detail.hit.zdb_id: 2130824-X
    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
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    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    Cobble Tracking Observations at Torrey Pines State Beach, CA, USA
    American Geophysical Union (AGU) ; 2023
    In:  Journal of Geophysical Research: Earth Surface Vol. 128, No. 9 ( 2023-09)
    Details
    In: Journal of Geophysical Research: Earth Surface, American Geophysical Union (AGU), Vol. 128, No. 9 ( 2023-09)
    Abstract: Three hundred forty four radio‐frequency identification tagged cobbles were tracked for 26 months at a southern California beach Cobble displacements increased with incident wave energy, fit an exponential distribution, and exhibited alongshore sub‐diffusive spreading The initial release location influenced cobble movement and final positions. Many cobbles moved to, or remained at higher, more stable elevations
    Type of Medium: Online Resource
    ISSN: 2169-9003 , 2169-9011
    URL: Article
    DOI: 10.1029/2023JF007199
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2023
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    detail.hit.zdb_id: 2130824-X
    detail.hit.zdb_id: 2138320-0
    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    The Effect of Barotropic and Baroclinic Tides on Three‐Dimensional Coastal Dispersion
    American Geophysical Union (AGU) ; 2018
    In:  Geophysical Research Letters Vol. 45, No. 20 ( 2018-10-28)
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 45, No. 20 ( 2018-10-28)
    Abstract: Compared to realistic models without tides, baroclinic tides induce 2‐3 times larger horizontal and vertical dispersion Three‐dimensional drifter tracking is important for passive tracer dispersion
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/2018GL079884
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2018
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    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 8
    Online Resource
    Online Resource
    The effect of a non-zero Lagrangian time scale on bounded shear dispersion
    Cambridge University Press (CUP) ; 2012
    In:  Journal of Fluid Mechanics Vol. 691 ( 2012-01-25), p. 69-94
    Details
    In: Journal of Fluid Mechanics, Cambridge University Press (CUP), Vol. 691 ( 2012-01-25), p. 69-94
    Abstract: Previous studies of shear dispersion in bounded velocity fields have assumed random velocities with zero Lagrangian time scale (i.e. velocities are $\delta $ -function correlated in time). However, many turbulent (geophysical and engineering) flows with mean velocity shear exist where the Lagrangian time scale is non-zero. Here, the longitudinal (along-flow) shear-induced diffusivity in a two-dimensional bounded velocity field is derived for random velocities with non-zero Lagrangian time scale ${\tau }_{L} $ . A non-zero ${\tau }_{L} $ results in two-time transverse (across-flow) displacements that are correlated even for large (relative to the diffusive time scale ${\tau }_{D} $ ) times. The longitudinal (along-flow) shear-induced diffusivity ${D}_{S} $ is derived, accurate for all ${\tau }_{L} $ , using a Lagrangian method where the velocity field is periodically extended to infinity so that unbounded transverse particle spreading statistics can be used to determine ${D}_{S} $ . The non-dimensionalized ${D}_{S} $ depends on time and two parameters: the ratio of Lagrangian to diffusive time scales ${\tau }_{L} / {\tau }_{D} $ and the release location. Using a parabolic velocity profile, these dependencies are explored numerically and through asymptotic analysis. The large-time ${D}_{S} $ is enhanced relative to the classic Taylor diffusivity, and this enhancement increases with $ \sqrt{{\tau }_{L} } $ . At moderate ${\tau }_{L} / {\tau }_{D} = 0. 1$ this enhancement is approximately a factor of 3. For classic shear dispersion with ${\tau }_{L} = 0$ , the diffusive time scale ${\tau }_{D} $ determines the time dependence and large-time limit of the shear-induced diffusivity. In contrast, for sufficiently large ${\tau }_{L} $ , a shear time scale ${\tau }_{S} = \mathop{ ({\tau }_{L} {\tau }_{D} )}\nolimits ^{1/ 2} $ , anticipated by a simple analysis of the particle’s domain-crossing time, determines both the ${D}_{S} $ time dependence and the large-time limit. In addition, the scalings for turbulent shear dispersion are recovered from the large-time ${D}_{S} $ using properties of wall-bounded turbulence.
    Type of Medium: Online Resource
    ISSN: 0022-1120 , 1469-7645
    URL: Article
    DOI: 10.1017/jfm.2011.443
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2012
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  • 9
    Online Resource
    Online Resource
    Observed and modeled drifters at a tidal inlet
    American Geophysical Union (AGU) ; 2015
    In:  Journal of Geophysical Research: Oceans Vol. 120, No. 7 ( 2015-07), p. 4825-4844
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 120, No. 7 ( 2015-07), p. 4825-4844
    Type of Medium: Online Resource
    ISSN: 2169-9275 , 2169-9291
    URL: Issue
    URL: Article
    DOI: 10.1002/jgrc.v120.7
    DOI: 10.1002/2014JC010541
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2015
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    SSG: 16,13
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  • 10
    Online Resource
    Online Resource
    Relative Dispersion on the Inner Shelf: Evidence of a Batchelor Regime
    American Meteorological Society ; 2021
    In:  Journal of Physical Oceanography Vol. 51, No. 2 ( 2021-02), p. 519-536
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 51, No. 2 ( 2021-02), p. 519-536
    Abstract: Oceanographic relative dispersion (based on drifter separations r ) has been extensively studied, mostly finding either Richardson–Obukhov ( ) or enstrophy cascade [ ] scaling. Relative perturbation dispersion (based on perturbation separation r − r 0 , where r 0 is the initial separation) has a Batchelor scaling ( ) for times less than the r 0 -dependent Batchelor time. Batchelor scaling has received little oceanographic attention. GPS-equipped surface drifters were repeatedly deployed on the Inner Shelf off of Pt. Sal, California, in water depths ≤ 40 m. From 12 releases of ≈18 drifters per release, perturbation and regular relative dispersion over ≈4 h are calculated for 250 ≤ r 0 ≤ 1500 m for each release and the entire experiment. The perturbation dispersion is consistent with Batchelor scaling for the first 1000–3000 s with larger r 0 yielding stronger dispersion and larger Batchelor times. At longer times, and scale-dependent diffusivities begin to suggest Richardson–Obukhov scaling. This applies to both experiment averaged and individual releases. For individual releases, nonlinear internal waves can modulate dispersion. Batchelor scaling is not evident in as the correlations between initial and later separations are significant at short time scaling as ~ t . Thus, previous studies investigating are potentially aliased by initial separation effects not present in the perturbation dispersion . As the underlying turbulent velocity wavenumber spectra is inferred from the dispersion power law time dependence, analysis of both and is critical.
    Type of Medium: Online Resource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/JPO-D-20-0170.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2021
    detail.hit.zdb_id: 2042184-9
    detail.hit.zdb_id: 184162-2
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