Transient Tidal Circulation and Momentum Balances at a Shallow Inlet

Hench, James L.; Luettich, Richard A.

doi:10.1175/1520-0485(2003)33<913:ttcamb>2.0.co;2

Cited by 99 publications

(106 citation statements)

References 29 publications

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“…These findings agree with the conceptual hypotheses of Sha (1989) and Sha and Van den Berg (1993). In a numerical model study for an idealized and a natural tidal inlet, Hench and Luettich (2003) give an additional explanation of how momentum balances contribute to circulation processes by tidal forcing alone. The inlet jet induces a "dynamical wall effect" with momentum imbalances due to tidal phase lags resulting in transient, cross-inlet elevation differences and thus secondary circulation for different stages of the tide.…”

Section: Sediment Recirculation Patterns At the Eastern Ebb-tidal Delmentioning

confidence: 99%

Morphological and sedimentological response of a mixed-energy barrier island tidal inlet to storm and fair-weather conditions

Herrling

2014

Earth Surf. Dynam.

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Abstract. The environment of ebb-tidal deltas between barrier island systems is characterized by a complex morphology with ebb-and flood-dominated channels, shoals and swash bars connecting the ebb-tidal delta platform to the adjacent island. These morphological features reveal characteristic surface sediment grain-size distributions and are subject to a continuous adaptation to the prevailing hydrodynamic forces. The mixed-energy tidal inlet Otzumer Balje between the East Frisian barrier islands of Langeoog and Spiekeroog in the southern North Sea has been chosen here as a model study area for the identification of relevant hydrodynamic drivers of morphology and sedimentology. We compare the effect of high-energy, wave-dominated storm conditions to mid-term, tide-dominated fair-weather conditions on tidal inlet morphology and sedimentology with a processbased numerical model. A multi-fractional approach with five grain-size fractions between 150 and 450 µm allows for the simulation of corresponding surface sediment grain-size distributions. Net sediment fluxes for distinct conditions are identified: during storm conditions, bed load sediment transport is generally onshore directed on the shallower ebb-tidal delta shoals, whereas fine-grained suspended sediment bypasses the tidal inlet by wave-driven currents. During fair weather the sediment transport mainly focuses on the inlet throat and the marginal flood channels. We show how the observed sediment grain-size distribution and the morphological response at mixed-energy tidal inlets are the result of both wave-dominated less frequent storm conditions and mid-term, tide-dominant fair-weather conditions.

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Section: Sediment Recirculation Patterns At the Eastern Ebb-tidal Delmentioning

confidence: 99%

Morphological and sedimentological response of a mixed-energy barrier island tidal inlet to storm and fair-weather conditions

Herrling

2014

Earth Surf. Dynam.

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“…The model was developed in the USA (Hench andLeuttich 2003, Leuttich andWesterink 1995) for use in modelling tides and surges on shelf seas. The ADCIRC model allows the simulation of multiple barrage schemes in conjunction to explore their cumulative impact upon the environment and their power production potential and was chosen because it is freely available online.…”

Section: -D Model (Adcirc)mentioning

confidence: 99%

Environmental impacts of tidal power schemes

Wolf

Walkington

Holt

et al. 2009

Proceedings of the Institution of Civil Engineers - Maritime En

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This paper describes the potential environmental changes caused by tidal power installations with illustration for schemes in the eastern Irish Sea, focussing mainly on major estuarine barrages. The generic impacts in the near-field and far-field are discussed. Results from a 0-D and a 2-D model are presented: the former allows rapid calculations to be made for a large range of options while the latter allows the full effect on 2D hydrodynamics to be investigated. It is shown that there may be a significant change in tidal amplitude at the coast of Northern Ireland. The bed stress in the Bristol Channel will be significantly reduced if a Severn barrage is constructed. Some effects on the tidal mixing are expected although the location of tidal fronts in the Irish and Celtic Seas will not be changed significantly. The largest environmental impact is expected to be on the amount of inter-tidal area retained after construction of an estuarine barrage. It is shown that the loss of mudflats can be substantially reduced by using a dual-mode (ebb and flood generation) scheme with an increased number of turbines over the lowest-cost option.

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“…Physical transport in the vicinity of barrier island inlets is strongly influenced by tides, local geometry, and bathymetry, which create a characteristic circulation pattern (e.g. Stommel & Farmer 1952, Zimmerman 1981, Brown et al 2000, Hench et al 2002 that is expected to hydrographically isolate adjacent water bodies on the landward side of barrier islands , Hench & Luettich 2003. On an ebb tide (Fig.…”

Section: Discussionmentioning

confidence: 99%

Basin-scale patterns of mtDNA differentiation and gene flow in the bay scallop Argopecten irradians concentricus

Marko¹,

Barr²

2007

Mar. Ecol. Prog. Ser.

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The bay scallop Argopecten irradians concentricus Say is a commercially and recreationally important species along the East Coast of the US that consistently shows evidence of recruitment limitation. To determine if limited planktonic larval exchange between populations inhabiting lagoonal basins or sounds contributes to recruitment limitation in central North Carolina, a hypervariable portion of mtDNA (885 bp) was sequenced from 219 adults from 4 sounds (Topsail, Bogue, Back, and Pamlico), 3 of which (Bogue, Back, and Pamlico) are connected by inshore waterways. Although the largest sound (Pamlico) harbored the greatest genetic diversity, diversity was high in all 4 sounds, with no evidence of recent bottlenecks. An analysis of molecular variance indicates significant genetic structure among sounds (φ CT = 0.0069, p = 0.023); all pairwise comparisons among sounds were significant, with the exception of those involving Pamlico Sound. Despite being connected by a short (3 km) inshore waterway, adjacent Bogue and Back Sounds were highly significantly differentiated (φ CT = 0.0145, p = 0.000). Coalescent-based estimates of gene flow indicated that most sounds exchange ≤ 4 migrants each generation. Bogue and Back Sound populations, which were heavily impacted by a localized red tide outbreak in 1987 and which subsequently experienced a recruitment failure, each receive < 4 migrants each generation from all other sounds combined. Dynamic physical processes in the vicinity of Beaufort Inlet can explain such limited larval exchange between Bogue and Back Sounds, but if dispersal is primarily controlled by tidally dominated surface flow, net dispersal distances may be limited throughout the region. Therefore, patterns of gene flow and genetic differentiation are consistent with the hypothesis that individual sounds are demographically independent and are closed with respect to fishery management issues.

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Transient Tidal Circulation and Momentum Balances at a Shallow Inlet

Cited by 99 publications

References 29 publications

Morphological and sedimentological response of a mixed-energy barrier island tidal inlet to storm and fair-weather conditions

Morphological and sedimentological response of a mixed-energy barrier island tidal inlet to storm and fair-weather conditions

Environmental impacts of tidal power schemes

Basin-scale patterns of mtDNA differentiation and gene flow in the bay scallop Argopecten irradians concentricus

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