Tidal exchange at the bay‐ocean boundary

Chadwick, D. B.; Largier, John L.

doi:10.1029/1999jc900165

Cited by 61 publications

(49 citation statements)

References 31 publications

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Section: Methodsmentioning

confidence: 99%

“…2). Maximum velocity estimates of this ebb-jet have been reported to be about 50 cm s -1 in the eastern side of the channel and 25 cm s The horizontal distribution of Stage I P. crassipes zoeae sampled at the entrance of SDB and tidal velocity estimates reported were more spatially uniform across stations than at the CBB site (Chadwick & Largier 1999).Differences in the horizontal distribution of Stage I Pachygrapsus crassipes and panopeid larvae relative to tidal currents at each site will affect larval exchange between regions of SDB and between SDB and nearshore coastal waters. In the case of panopeid larvae, the vertical distribution, which is uniform, may be less important to net transport than the observed horizontal distribution relative to tidal currents at the CBB site.…”

mentioning

confidence: 99%

“…Once larvae are released into the water column, physical features can concentrate or disperse them. For example, an intensified ebb-tide current that develops on the eastern side of the channel extending from inside the Coronado Bay Bridge past the CBB site has been documented by Chadwick & Largier (1999). This tidal jet would entrain newly released zoeae and keep them concentrated in the eastern region of the channel, within a few hundred meters from shore.…”

mentioning

confidence: 99%

“…Other sources of freshwater include non-point source runoff during winter storms and incidental runoff from agricultural and landscape watering. The negligible freshwater inflow results in sluggish circulation and a marked increase in average residence time estimates for the inner regions of SDB (Largier et al 1996, 1997, Chadwick & Largier 1999.Larval transport simulations. The extent to which physical processes and larval behavior mediate the transport and dispersal of brachyuran larvae spawned in SDB was examined using computer simulations.…”

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confidence: 99%

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Vertical migration behavior and horizontal distribution of brachyuran larvae in a low-inflow estuary: implications for bay-ocean exchange

DiBacco

Sutton²,

McConnico³

2001

Mar. Ecol. Prog. Ser.

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Rhythmic vertical migration has been well documented as a behavioral mechanism of brachyuran larvae that are actively exported from or retained within estuaries with net tidal residual flows, such as partially mixed estuaries. However, the effectiveness of vertical migratory behavior in mediating net larval transport in a low-inflow estuary (LIE), which is characterized by little or no freshwater inflow for extended periods of time, has not been addressed. Larval transport hypotheses, developed using a validated hydrodynamic model of San Diego Bay (SDB; an LIE), predicted that vertical migratory behavior was necessary to transport larvae out of the bay, while larvae lacking vertical migratory behavior would be retained within the bay. These predictions were tested in a field study that examined the temporal and spatial (vertical and horizontal) distribution of 2 brachyuran families, Pachygrapsus crassipes (Grapsidae) and Lophopanopeus spp. (Panopeidae), sampled at 2 sites within SDB. P. crassipes zoeae exhibited vertical migratory behavior, which enhanced their net export from the bay. Stage I P. crassipes zoeae were concentrated in surface layers (0 to 2 m) during nocturnal ebb tides, but exploited low-velocity conditions associated with the benthic-boundary layer, which retarded transport back into the bay during flood tide. The lack of Post-Stage I P. crassipes zoeae within SDB suggests that the observed vertical migratory behavior was an effective means for exiting the bay. Stage I and Post-Stage I Lophopanopeus spp. larvae were sampled within SDB, but exhibited no clear rhythmic migration patterns. The lack of vertical migratory behavior and the presence of all larval stages of development suggest that Lophopanopeus spp. larvae were retained within the bay throughout meroplanktonic development. Heterogeneous horizontal distributions of Stage I P. crassipes and Lophopanopeus spp. zoeae reflect hatching sites and physical circulation features which concentrate larvae at specific areas. Differences in larval behavior observed for grapsid and panopeid larvae in SDB had a significant effect on their dispersal and retention.KEY WORDS: Larval behavior · Selective tidal stream transport · Low-inflow estuary · Vertical migration · Zoeae · Larvae · Numerical simulations · San Diego Bay · Pachygrapsus crassipes · Lophopanopeus spp. 217: 191-206, 2001 they develop prior to reentering estuaries and recruiting to adult populations (Christy 1982). The coupling of vertical migration by larvae with differential horizontal advection associated with tidal phase, termed selective tidal stream transport, can mediate the horizontal distribution and dispersal of planktonic larvae (Epifanio 1988, McConaugha 1988. Bousfield (1955) recognized that vertical movements out of seaward-moving water layers could facilitate larval retention within an estuary. Vertical migratory behavior has been well documented in decapod larvae (recent studies include Paula 1989, Queiroga et al. 1994, 1997, Lochmann et al. 1995, Rodriguez et ...

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Vertical migration behavior and horizontal distribution of brachyuran larvae in a low-inflow estuary: implications for bay-ocean exchange

DiBacco

Sutton²,

McConnico³

2001

Mar. Ecol. Prog. Ser.

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“…Moreover, all of these acoustic methods are strictly limited to weakly stratified flows and none give an accurate measure of the turbulent mixing over large scales. Conductivity, Temperature and Depth (CTD) profilers equipped with fluorometers can be used to track natural or injected dye tracer to better understand mixing [2]. However, these results are still limited to non-synoptic profile data.…”

Section: Introductionmentioning

confidence: 99%

Development of a Hydraulic-Control Wave-Maker (Hcw) for the Study of Combined Waves and Flows

Lynett

2014

Int. Conf. Coastal. Eng.

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The aim of the research presented here is to develop a new experimental device which would permit the study of multiscale and vertically-variable oceanographic flows using a system called the Hydraulic-Control Wave-maker (HCW). Both the inlet and outlet flume boundaries are composed of an adjustable set of vertical baffles. Each baffle is connected to an individual flow control system, such that the vertical distribution of flow is entirely controllable. In such a system, any arbitrary flow can be reasonably created, and different sets of baffles can be connected to different reservoirs to create vertical density profiles. In this study, before constructing the experimental device, numerical analyses to verify the method of HCW, such as its ability to generate waves are carried out. Moreover, the small physical model with one baffle connected to our own flow control system is developed by ourselves. Long and short sine wave are generated by a small-scale HCW and the snapshots are presented. In practical, thus, The possibility of system can be confirmed.

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Observations and modeling of a tidal inlet dye tracer plume

et al. 2016

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A 9 km long tracer plume was created by continuously releasing Rhodamine WT dye for 2.2 h during ebb tide within the southern edge of the main tidal channel at New River Inlet, NC on 7 May 2012, with highly obliquely incident waves and alongshore winds. Over 6 h from release, COAWST (coupled ROMS and SWAN, including wave, wind, and tidal forcing) modeled dye compares well with (aerial hyperspectral and in situ) observed dye concentration. Dye first was transported rapidly seaward along the main channel and partially advected across the ebb‐tidal shoal until reaching the offshore edge of the shoal. Dye did not eject offshore in an ebb‐tidal jet because the obliquely incident breaking waves retarded the inlet‐mouth ebb‐tidal flow and forced currents along the ebb shoal. The dye plume largely was confined to <4 m depth. Dye was then transported downcoast in the narrow (few 100 m wide) surfzone of the beach bordering the inlet at 0.3 m s−1 driven by wave breaking. Over 6 h, the dye plume is not significantly affected by buoyancy. Observed dye mass balances close indicating all released dye is accounted for. Modeled and observed dye behaviors are qualitatively similar. The model simulates well the evolution of the dye center of mass, lateral spreading, surface area, and maximum concentration, as well as regional (“inlet” and “ocean”) dye mass balances. This indicates that the model represents well the dynamics of the ebb‐tidal dye plume. Details of the dye transport pathways across the ebb shoal are modeled poorly perhaps owing to low‐resolution and smoothed model bathymetry. Wave forcing effects have a large impact on the dye transport.

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Tidal exchange at the bay‐ocean boundary

Cited by 61 publications

References 31 publications

Vertical migration behavior and horizontal distribution of brachyuran larvae in a low-inflow estuary: implications for bay-ocean exchange

Vertical migration behavior and horizontal distribution of brachyuran larvae in a low-inflow estuary: implications for bay-ocean exchange

Development of a Hydraulic-Control Wave-Maker (Hcw) for the Study of Combined Waves and Flows

Observations and modeling of a tidal inlet dye tracer plume

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