Ebb-tidal flow characteristics near inlets

Özsoy, Emin; Ünlüata, Ümi̇t

doi:10.1016/s0302-3524(82)80015-7

Cited by 50 publications

(76 citation statements)

References 11 publications

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“…First, we will verify the proposed velocity model with the field measurements and compare it with known jet flow model ( Ozsoy and Unluata, 1982 ) along with the hydrodynamic model MOHID ( Marcos and Neves, 2013 ). Second, we will compare the analytically developed concentration moments with concentration moments calculated by the numerical model.…”

Section: Resultsmentioning

confidence: 99%

“…Proposed exponential attenuation model for mean velocity (16) was additionally tested and compared to the hydrodynamic model MOHID as well as to the existing theoretical model for jet flow ( Ozsoy and Unluata, 1982 ). Recent velocity measurements with the same experimental setup were conducted at 9 different locations (see Fig.…”

Section: Verification Of Proposed Velocity Modelmentioning

confidence: 99%

See 1 more Smart Citation

Concentration statistics of solute transport for the near field zone of an estuary

Galešić

Andričević

Gotovac

et al. 2016

Advances in Water Resources

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Section: Resultsmentioning

confidence: 99%

Section: Verification Of Proposed Velocity Modelmentioning

confidence: 99%

Concentration statistics of solute transport for the near field zone of an estuary

Galešić

Andričević

Gotovac

et al. 2016

Advances in Water Resources

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“…A number of analytical predications of river mouth hydrodynamics have suggested that increasing bed friction will increase the rate of momentum extraction from the flow, increase the rate of flow deceleration and increase the lateral spreading of the outflow [e.g., Borichansky and Mikhailov , 1966; Ozsoy , 1977, 1986; Ozsoy and Unluata , 1982; Wang , 1984; Izumi et al , 1999]. All of these feedbacks may in turn influence the spatial patterns of sediment transport and deposition.…”

Section: Discussionmentioning

confidence: 99%

Morphodynamics of subaqueous levee formation: Insights into river mouth morphologies arising from experiments

2010

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[1] Levee formation by deposition from sediment-laden flows debouching into open waters has been conceptually and analytically linked to jet hydrodynamics since the middle of the 20th century. Despite this long-standing association between jets and levees, the morphodynamics controlling subaqueous levee development remain largely unquantified and poorly understood. Here we report the results of physical experiments on subaqueous levee development modeled on floodplain tie channel processes. In the laboratory, we created subaqueous levees from a sediment-laden jet entering a basin of still water. Levee formation occurred where the local shear velocity of the jet declined below the critical shear velocity for entrainment of sediment into suspension. The rate of levee deposition depended on the rate of lateral sediment transfer to the jet margins and the settling velocity of suspended sediment. In our friction-dominated flows, lateral sediment flux to the levees was primarily due to dispersive lateral transport driven by turbulence. High rates of sediment transfer from the jet core to the margins led to levee growth that outpaced deposition along the flow centerline. Under hypopycnal conditions, we failed to produce levees. We observed distinct differences in levee morphology due to changes in the size and density of suspended sediment under identical hydrodynamic conditions. Our experimental results and review of published data on hypopycnal river mouths suggest that suspended sediment characteristics, relative magnitude of bed friction, and channel outlet aspect ratios may have a more significant influence on river mouth morphology than the buoyancy of discharging waters as envisioned in existing conceptual models.Citation: Rowland, J. C., W. E. Dietrich, and M. T. Stacey (2010), Morphodynamics of subaqueous levee formation: Insights into river mouth morphologies arising from experiments,

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“…The approximate equations of motion for the jet, derived from the standard shallow water equations, are the following [ Ozsoy and Unluata , ]:

\frac{\partial D u^{2}}{\partial x} + \frac{\partial Duv}{\partial y} - \frac{g u^{2}}{c^{2}} + \frac{1}{ρ} \frac{\partial {italicτ}_{italicyx}}{\partial y}

\frac{\partial Du}{\partial x} + \frac{\partial Dv}{\partial y} = 0

where u , v are the depth‐averaged x ‐, y ‐directed fluid velocities, C is the Chezy coefficient, and ρ , D , τ yx , g are the fluid density, water depth, lateral shear stress, and gravitational acceleration, respectively. Different from the original formulation of Ozsoy and Unluata [], here the friction term is expressed with the Chezy coefficient rather than with the friction coefficient f .…”

Section: Introductionmentioning

confidence: 86%

“…The initial bar progrades basinward, and eventually, the bar stagnates, flow bifurcates around it, leading to runaway vertical aggradation and bar emergence. It is not clear how waves modify this morphodynamic process, but previous work [ Oszoy and Unluata , ; Ismail and Wiegel , ] has shown that waves drastically alter the dynamics of jet spreading, which is a key component for mouth bar formation. Our hypothesis is that waves will increase the spreading of the turbulent jet and therefore create wider mouth bars that stagnate closer to the river mouth.…”

Section: Introductionmentioning

confidence: 99%

Growth of river mouth bars in sheltered bays in the presence of frontal waves

et al. 2013

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[1] One of the key processes for the formation of deltas and their fluvial networks is the deposition of mouth bars in front of prograding distributaries. Waves influence mouth bar growth, but it is not clear how and to what extent. Toward this end, we conduct a modeling study on deltas forming in sheltered bays, where waves are locally generated and both longshore currents and surf zone are absent. We focus on the simplified case of a homopycnal river plume subject to frontal wave attack, and we begin by isolating the effects of waves on jet spreading. An analytical model for the hydrodynamic interaction between incoming waves and a turbulent expanding jet is developed and tested with the numerical model Delft3D coupled to the wave model SWAN. Both the analytical model and Delft3D predict that incoming surface gravity waves increase the spreading of the jet and the interaction between wave and current boundary layers causes an increase in bottom friction. To investigate how waves influence mouth bar morphodynamics, a set of numerical simulations is run with Delft3D-SWAN utilizing a geometry and wave characteristics typical of sheltered bays. Our numerical results show that in the presence of waves, mouth bars form up to 35% closer to the river mouth and 40% faster when compared to cases without waves. The distance from the river mouth to the stagnated mouth bar decreases with increasing wave height and wave period. The timescale of bar formation is inversely proportional to wave height and directly proportional to wave period. Our modeling study suggests that wave influence on mouth bar growth is complex. Small waves, like the ones modeled here, promote mouth bar formation via increased jet spreading and faster formation time, which in turn should create deltas with more distributary channels. On the other hand, large waves suppress mouth bar formation, as seen in other studies, leading to fewer distributary channels.

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Ebb-tidal flow characteristics near inlets

Cited by 50 publications

References 11 publications

Concentration statistics of solute transport for the near field zone of an estuary

Concentration statistics of solute transport for the near field zone of an estuary

Morphodynamics of subaqueous levee formation: Insights into river mouth morphologies arising from experiments

Growth of river mouth bars in sheltered bays in the presence of frontal waves

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