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Articoli di riviste sul tema "Boundary currents"

Autore: Grafiati

Pubblicato: 25 gennaio 2025

Ultima modifica: 31 luglio 2025

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1

Hogg, Nelson G., and William E. Johns. "Western boundary currents." Reviews of Geophysics 33, S2 (1995): 1311–34. http://dx.doi.org/10.1029/95rg00491.

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2

Ruju, Andrea, Pablo Higuera, Javier L. Lara, Inigo J. Losada, and Giovanni Coco. "RIP CURRENTS ON A BARRED BEACH." Coastal Engineering Proceedings 1, no. 33 (2012): 38. http://dx.doi.org/10.9753/icce.v33.currents.38.

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This work presents the numerical study of rip current circulation on a barred beach. The numerical simulations have been carried out with the IH-FOAM model which is based on the three dimensional Reynolds Averaged Navier-Stokes equations. The new boundary conditions implemented in IH-FOAM have been used, including three dimensional wave generation as well as active wave absorption at the boundary. Applying the specific wave generation boundary conditions, the model is validated to simulate rip circulation on a barred beach. Moreover, this study addresses the identification of the forcing mecha

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3

Cessi, Paola, and Christopher L. Wolfe. "Adiabatic Eastern Boundary Currents." Journal of Physical Oceanography 43, no. 6 (2013): 1127–49. http://dx.doi.org/10.1175/jpo-d-12-0211.1.

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Abstract The dynamics of the eastern boundary current of a high-resolution, idealized model of oceanic circulation are analyzed and interpreted in terms of residual mean theory. In this framework, it is clear that the eastern boundary current is adiabatic and inviscid. Nevertheless, the time-averaged potential vorticity is not conserved along averaged streamlines because of the divergence of Eliassen–Palm fluxes, associated with buoyancy and momentum eddy fluxes. In particular, eddy fluxes of buoyancy completely cancel the mean downwelling or upwelling, so that there is no net diapycnal residu

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4

Ozdemir, Celalettin Emre, and Sahar Haddadian. "SEDIMENT TRANSPORT DUE TO CURRENT-SUPPORTED TURBIDITY CURRENTS OVER AN ERODIBLE BED." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 33. http://dx.doi.org/10.9753/icce.v36.currents.33.

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Wave- and current-supported turbidity currents (WCSTCs), are one of the chief participants in shaping the marine geomorphology. What makes WCSTCs different from other turbidity currents is that boundary layer turbulence is required to suspend the sediments rather than the self-motion of the turbidity currents. In the presence of a mild slope, the gravitational acceleration drives the suspended sediments offshore (Sternberg et al., 1996; Wright et al., 2001). Depending on what dominates the boundary layer turbulence (BLT), we further define two major subclasses of WCSTCs: (i) wave-supported (WS

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5

Capodicasa, Erminia, Pietro Scandura, and Foti Enrico. "STEADY CURRENTS INDUCED BY SEA WAVES PROPAGATING OVER A SLOPING BOTTOM." Coastal Engineering Proceedings 1, no. 32 (2011): 35. http://dx.doi.org/10.9753/icce.v32.currents.35.

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A numerical model aimed at computing the mean velocity generated by a sea wave propagating over a sloping bottom, offshore the breaker line, is presented. The model is based on the assumption that the fluid domain can be partitioned into two boundary layers and a core region where at a first order of approximation the flow can be regarded as irrotational. The irrotational flow is computed by using a theory based on the assumption of small amplitude waves which allows both fully absorbed waves and partially reflected waves at the coastline to be considered. The distribution of the mean velocity

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6

Sana, Ahmad, and Hitoshi Tanaka. "NUMERICAL MODELING OF A TURBULENT BOTTOM BOUNDARY LAYER UNDER SOLITARY WAVES ON A SMOOTH SURFACE." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 26. http://dx.doi.org/10.9753/icce.v36.currents.26.

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A number of studies on bottom boundary layers under sinusoidal and cnoidal waves were carried out in the past owing to the role of bottom shear stress on coastal sediment movement. In recent years, the bottom boundary layers under long waves have attracted considerable attention due to the occurrence of huge tsunamis and corresponding sediment movement. In the present study two-equation turbulent models proposed by Menter(1994) have been applied to a bottom boundary layer under solitary waves. A comparison has been made for cross-stream velocity profile and other turbulence properties in x-dir

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7

Cember, Richard P. "On deep western boundary currents." Journal of Geophysical Research: Oceans 103, no. C3 (1998): 5397–417. http://dx.doi.org/10.1029/97jc02422.

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8

Csanady, G. T., and J. L. Pelegri. "Vorticity balance of boundary currents." Journal of Marine Research 53, no. 2 (1995): 171–87. http://dx.doi.org/10.1357/0022240953213269.

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9

Adityawan, Mohammad Bagus, Hitoshi Tanaka, and Pengzhi Lin. "BED STRESS INVESTIGATION UNDER BREAKING SOLITARY WAVE RUNUP." Coastal Engineering Proceedings 1, no. 33 (2012): 23. http://dx.doi.org/10.9753/icce.v33.currents.23.

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The bed stress under breaking solitary wave runup was investigated in this study using the Simultaneous Coupling Method (SCM). The SCM couples the shallow water equation (SWE) with k-w model. The depth averaged velocity from SWE is applied as the upper boundary condition in k-w model for bed stress assessment from the boundary layer. It was found that the boundary layer approach provides more accurate bed stress estimation than the empirical method, which leads to a more accurate prediction of runup and wave profile. The accumulation of bed stress in during solitary wave runup was evaluated. T

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10

Ma, Peifeng, and Ole Secher Madsen. "AN OPEN BOUNDARY CONDITION FOR APPLICATION IN NUMERICAL COASTAL MODELS." Coastal Engineering Proceedings 1, no. 32 (2011): 30. http://dx.doi.org/10.9753/icce.v32.currents.30.

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Open boundaries (OBs) are usually unavoidable in numerical coastal circulation simulations. At OBs, appropriate open boundary conditions (OBCs) are required and a good OBC should be able to let outgoing waves freely pass to the exterior of a computational domain without creating reflections at the OBs. In the present study, a methodology has been developed to predict two parameters, phase speed c_r and decay time T_f, in a standard OBC formulation, so that the OBC is significantly improved compared to commonly used existing OBCs with specified c_r and T_f. For the conditions where wave period

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11

Larsen, Bjarke Eltard, and David R. Fuhrman. "RUN-UP, BOUNDARY LAYERS AND SHEAR STRESSES BENEATH SHOALING TSUNAMIS." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 24. http://dx.doi.org/10.9753/icce.v36.currents.24.

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While the tsunami propagation, run-up and inundation has received considerable attention in literature, the associated boundary layer dynamics and induced sediment transport have received relatively little attention. Recently, Williams and Fuhrman (2016) simulated a series of tsunami scale boundary layers, emphasizing that they are simultaneously both current- and wave-like due to their long duration yet unsteady nature. They viewed the tsunami as a time varying current, something that has also been done by Larsen et al. (2017) and Larsen et al. (2018) in studies of tsunami-induced scour aroun

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12

Hristova, Hristina G., Joseph Pedlosky, and Michael A. Spall. "Radiating Instability of a Meridional Boundary Current." Journal of Physical Oceanography 38, no. 10 (2008): 2294–307. http://dx.doi.org/10.1175/2008jpo3853.1.

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Abstract A linear stability analysis of a meridional boundary current on the beta plane is presented. The boundary current is idealized as a constant-speed meridional jet adjacent to a semi-infinite motionless far field. The far-field region can be situated either on the eastern or the western side of the jet, representing a western or an eastern boundary current, respectively. It is found that when unstable, the meridional boundary current generates temporally growing propagating waves that transport energy away from the locally unstable region toward the neutral far field. This is the so-cal

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13

Bresch, Didier, and Jacques Simon. "Western boundary currents versus vanishing depth." Discrete & Continuous Dynamical Systems - B 3, no. 3 (2003): 469–77. http://dx.doi.org/10.3934/dcdsb.2003.3.469.

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14

Pelegrí, J. L., and G. T. Csanady. "Diapycnal mixing in western boundary currents." Journal of Geophysical Research 99, no. C9 (1994): 18275. http://dx.doi.org/10.1029/94jc01201.

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15

Spall, Michael A. "Buoyancy-Forced Downwelling in Boundary Currents." Journal of Physical Oceanography 38, no. 12 (2008): 2704–21. http://dx.doi.org/10.1175/2008jpo3993.1.

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Abstract The issue of downwelling resulting from surface buoyancy loss in boundary currents is addressed using a high-resolution, nonhydrostatic numerical model. It is shown that the net downwelling is determined by the change in the mixed layer density along the boundary. For configurations in which the density on the boundary increases in the direction of Kelvin wave propagation, there is a net downwelling within the domain. For cases in which the density decreases in the direction of Kelvin wave propagation, cooling results in a net upwelling within the domain. Symmetric instability within

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16

Pierini, Stefano. "Wind-Driven Fluctuating Western Boundary Currents." Journal of Physical Oceanography 28, no. 11 (1998): 2185–98. http://dx.doi.org/10.1175/1520-0485(1998)028<2185:wdfwbc>2.0.co;2.

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17

da Silveira, Ilson C. A., Glenn R. Flierl, and Wendell S. Brown. "Dynamics of Separating Western Boundary Currents." Journal of Physical Oceanography 29, no. 2 (1999): 119–44. http://dx.doi.org/10.1175/1520-0485(1999)029<0119:doswbc>2.0.co;2.

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18

Lee, Sang-Ki, J. L. Pelegrí, and John Kroll. "Slope Control in Western Boundary Currents." Journal of Physical Oceanography 31, no. 11 (2001): 3349–60. http://dx.doi.org/10.1175/1520-0485(2001)031<3349:sciwbc>2.0.co;2.

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19

Capet, Xavier J., and Xavier J. Carton. "Nonlinear Regimes of Baroclinic Boundary Currents." Journal of Physical Oceanography 34, no. 6 (2004): 1400–1409. http://dx.doi.org/10.1175/1520-0485(2004)034<1400:nrobbc>2.0.co;2.

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20

Cessi, Paola. "Recirculation and separation of boundary currents." Journal of Marine Research 48, no. 1 (1990): 1–35. http://dx.doi.org/10.1357/002224090784984597.

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21

Cessi, Paola, R. Vance Condie, and W. R. Young. "Dissipative dynamics of western boundary currents." Journal of Marine Research 48, no. 4 (1990): 677–700. http://dx.doi.org/10.1357/002224090784988719.

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22

MacCready, Parker. "Frictional decay of abyssal boundary currents." Journal of Marine Research 52, no. 2 (1994): 197–217. http://dx.doi.org/10.1357/0022240943077073.

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23

Thomas, A. C., M. E. Carr, and P. T. Strub. "Chlorophyll variability in eastern boundary currents." Geophysical Research Letters 28, no. 18 (2001): 3421–24. http://dx.doi.org/10.1029/2001gl013368.

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24

Pierini, S. "Stable equivalent-barotropic oceanic boundary currents." Il Nuovo Cimento C 10, no. 3 (1987): 323–35. http://dx.doi.org/10.1007/bf02524831.

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25

Agra, Cigdem, and Doron Nof. "Collision and separation of boundary currents." Deep Sea Research Part I: Oceanographic Research Papers 40, no. 11-12 (1993): 2259–82. http://dx.doi.org/10.1016/0967-0637(93)90103-a.

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26

Cessi, Paola, and Glenn R. Ierley. "Nonlinear Disturbances of Western Boundary Currents." Journal of Physical Oceanography 23, no. 8 (1993): 1727–35. http://dx.doi.org/10.1175/1520-0485(1993)023<1727:ndowbc>2.0.co;2.

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27

Seager, Richard, and Isla R. Simpson. "Western boundary currents and climate change." Journal of Geophysical Research: Oceans 121, no. 9 (2016): 7212–14. http://dx.doi.org/10.1002/2016jc012156.

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28

Kuehl, Joseph J., and V. A. Sheremet. "Two-layer gap-leaping oceanic boundary currents: experimental investigation." Journal of Fluid Mechanics 740 (January 10, 2014): 97–113. http://dx.doi.org/10.1017/jfm.2013.645.

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AbstractThe problem of oceanic gap-traversing boundary currents, such as the Kuroshio current crossing the Luzon Strait or the Gulf Stream traversing the mouth of the Gulf of Mexico, is considered. Systems such as these are known to admit two dominant states: leaping across the gap or penetrating into the gap forming a loop current. Which state the system will assume and when transitions between states will occur are open problems. Sheremet (J. Phys. Oceanogr., vol. 31, 2001, pp. 1247–1259) proposed, based on idealized barotropic numerical results, that variation in the current’s inertia is re

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29

von Dassow, George, Richard Emlet, and Daniel Grünbaum. "Boundary effects on currents around ciliated larvae." Nature Physics 13, no. 6 (2017): 520–21. http://dx.doi.org/10.1038/nphys4154.

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30

Hilgenkamp, H., C. W. Schneider, B. Goetz, et al. "Grain boundary critical currents - a new perspective." Superconductor Science and Technology 12, no. 12 (1999): 1043–45. http://dx.doi.org/10.1088/0953-2048/12/12/301.

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31

Bane, John M., Ruoying He, Michael Muglia, Caroline F. Lowcher, Yanlin Gong, and Sara M. Haines. "Marine Hydrokinetic Energy from Western Boundary Currents." Annual Review of Marine Science 9, no. 1 (2017): 105–23. http://dx.doi.org/10.1146/annurev-marine-010816-060423.

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32

Cessi, Paola. "Laminar separation of colliding western boundary currents." Journal of Marine Research 49, no. 4 (1991): 697–717. http://dx.doi.org/10.1357/002224091784995738.

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33

Jacobs, Pieter, Yakun Guo, and Peter A. Davies. "Boundary currents over shelf and slope topography." Journal of Marine Systems 19, no. 1-3 (1999): 137–58. http://dx.doi.org/10.1016/s0924-7963(98)00056-6.

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34

Hughes, Roger L. "A frictional sublayer for western boundary currents." Dynamics of Atmospheres and Oceans 17, no. 4 (1993): 243–56. http://dx.doi.org/10.1016/0377-0265(93)90023-z.

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35

Bernatzki, Felicia. "Mass-minimizing currents with an elastic boundary." Manuscripta Mathematica 93, no. 1 (1997): 1–20. http://dx.doi.org/10.1007/bf02677453.

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36

Waugh, Darryn W., and Timothy M. Hall. "Propagation of Tracer Signals in Boundary Currents." Journal of Physical Oceanography 35, no. 9 (2005): 1538–52. http://dx.doi.org/10.1175/jpo2779.1.

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Abstract The propagation of a range of tracer signals in a simple model of the deep western boundary current is examined. Analytical expressions are derived in certain limits for the transit-time distributions and the propagation times (tracer ages) of tracers with exponentially growing or periodic concentration histories at the boundary current’s origin. If mixing between the boundary current and the surrounding ocean is either very slow or very rapid, then all tracer signals propagate at the same rate. In contrast, for intermediate mixing rates tracer ages generally depend on the history of

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37

Mamchuk, Vitalii, and Leonid Romaniuk. "Calculation of some turbulent wall currents." Scientific journal of the Ternopil national technical university 1, no. 101 (2021): 89–93. http://dx.doi.org/10.33108/visnyk_tntu2021.01.089.

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A mathematical model for the calculation of turbulent boundary layers and wall stream has been developed. The results of calculations are compared with the results of other authors on the compliance of the calculated values with the experimental data. The currents that are formed under the influence of positive pressure gradients and lead to the phenomenon of separation of the turbulent boundary layer are studied.

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38

Vasarmidis, Panagiotis, Georgios Klonaris, Marcel Zijlema, Vasiliki Stratigaki, and Peter Troch. "IMPROVED HIGHER-ORDER BOUNDARY CONDITIONS FOR WAVE GENERATION IN THE NON-HYDROSTATIC MODEL SWASH." Coastal Engineering Proceedings, no. 38 (May 29, 2025): 9. https://doi.org/10.9753/icce.v38.currents.9.

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The increase in computational power in recent years has made it feasible to apply the non-linear phase-resolving wave propagation model SWASH to investigate long sea states in large coastal regions and port environments. One of the key requirements for phase-resolving models is the ability to generate and maintain a homogeneous wave field throughout the entire area under examination. However, a well-known challenge associated with non- linear wave models is related to the generation and propagation of spurious free waves, leading to wave fields that lack homogeneity. Within the present study,

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39

BALACHANDRAN, A. P., S. VAIDYA, G. BIMONTE, T. R. GOVINDARAJAN, K. S. GUPTA, and V. JOHN. "CURRENT OSCILLATIONS, INTERACTING HALL DISCS AND BOUNDARY CFTs." International Journal of Modern Physics A 14, no. 07 (1999): 1061–85. http://dx.doi.org/10.1142/s0217751x99000531.

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In this paper, we discuss the behavior of conformal field theories interacting at a single point. The edge states of the quantum Hall effect (QHE) system give rise to a particular representation of a chiral Kac–Moody current algebra. We show that in the case of QHE systems interacting at one point we obtain a "twisted" representation of the current algebra. The condition for stationarity of currents is the same as the classical Kirchoff's law applied to the currents at the interaction point. We find that in the case of two discs touching at one point, since the currents are chiral, they are no

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40

Matano, Ricardo P., and Elbio D. Palma. "On the Upwelling of Downwelling Currents." Journal of Physical Oceanography 38, no. 11 (2008): 2482–500. http://dx.doi.org/10.1175/2008jpo3783.1.

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Abstract The term “downwelling currents” refers to currents with a downslope mass flux in the bottom boundary layer. Examples are the Malvinas and Southland Currents in the Southern Hemisphere and the Oyashio in the Northern Hemisphere. Although many of these currents generate the same type of highly productive ecosystems that is associated with upwelling regimes, the mechanism that may drive such upwelling remains unclear. In this article, it is postulated that the interaction between a downwelling current and the continental slope generates shelfbreak upwelling. The proposed mechanism is rel

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41

D'Hieres, G. Chabert, H. Didelle, and D. Obaton. "A laboratory study of surface boundary currents: Application to the Algerian Current." Journal of Geophysical Research 96, no. C7 (1991): 12539. http://dx.doi.org/10.1029/91jc00998.

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42

Lazzeretti, Paolo. "Topological definition of ring currents." Physical Chemistry Chemical Physics 18, no. 17 (2016): 11765–71. http://dx.doi.org/10.1039/c5cp06865g.

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A definition of ring currents in a velocity vector field is proposed according to topological criteria: ring currents are axial vortices confined in, or rotating beyond, a separatrix, i.e., the boundary which marks the limits of the vortex.

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43

Higuera, Pablo, Philip L. F. Liu, Cheng Lin, Wei-Ying Wong, and Ming-Jer Kao. "HIGHLY-RESOLVED NUMERICAL AND LABORATORY ANALYSIS FOR NONBREAKING SOLITARY WAVE SWASH OVER A STEEP SLOPE." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 36. http://dx.doi.org/10.9753/icce.v36.currents.36.

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In this paper we study the swash processes generated by a nonbreaking solitary wave running up and down a steep slope (1:3). We use experimental data to study flow features and velocities inside the boundary layer, and numerical modelling to investigate variables not measured during the laboratory experiments, such as pressures and bottom shear stress. We focus on the mechanisms that produce flow separation and vortex formation. Particularly, we study a system of vortices generated under a hydraulic jump during the rundown phase, which was first observed by Matsunaga & Honji (1980).

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44

Edwards, Catherine R., and Harvey E. Seim. "Complex EOF Analysis as a Method to Separate Barotropic and Baroclinic Velocity Structure in Shallow Water." Journal of Atmospheric and Oceanic Technology 25, no. 5 (2008): 808–21. http://dx.doi.org/10.1175/2007jtecho562.1.

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Abstract Defining the vertical depth average of measured currents to be barotropic is a widely used method of separating barotropic and baroclinic tidal currents in the ocean. Away from the surface and bottom boundary layers, depth-averaging measured velocity is an excellent estimate of barotropic tidal flow, and internal tidal dynamics can be well represented by the difference between the measured currents and their depth average in the vertical. However, in shallow and/or energetic tidal environments such as the shelf of the South Atlantic Bight (SAB), bottom boundary layers can occupy a sig

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45

Wang, Qiang, Yinxia Wang, Junpeng Sui, Weidong Zhou, and Daning Li. "Effects of Weak and Strong Winter Currents on the Thermal State of the South China Sea." Journal of Climate 34, no. 1 (2021): 313–25. http://dx.doi.org/10.1175/jcli-d-19-0790.1.

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AbstractThe thermal state of the South China Sea (SCS) modulates the regional climate variability over Southeast Asia. Currents in the SCS are an important factor impacting the thermal state of the SCS, but their relationship is not clearly understood. There is an asymmetry in the thermal effect of weak and strong SCS winter currents. Weak SCS winter currents favor stable warm advection of mean temperature by the anomalous horizontal velocity (i.e., Advha), which drives the SCS into a warm phase. However, the cooling effect of strong SCS winter currents on the SCS is weak, due to small and var

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46

Swallow, John, Michèle Fieux, and Friedrich Schott. "The boundary currents east and north of Madagascar: 1. Geostrophic currents and transports." Journal of Geophysical Research 93, no. C5 (1988): 4951. http://dx.doi.org/10.1029/jc093ic05p04951.

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47

Yang, Xiaoting, Eli Tziperman, and Kevin Speer. "Deep Eastern Boundary Currents: Idealized Models and Dynamics." Journal of Physical Oceanography 51, no. 4 (2021): 989–1005. http://dx.doi.org/10.1175/jpo-d-20-0227.1.

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AbstractConcentrated poleward flows along eastern boundaries between 2- and 4-km depth in the southeast Pacific, Atlantic, and Indian Oceans have been observed, and appear in data assimilation products and regional model simulations at sufficiently high horizontal resolution, but their dynamics are still not well understood. We study the local dynamics of these deep eastern boundary currents (DEBCs) using idealized GCM simulations, and we use a conceptual vorticity model for the DEBCs to gain additional insights into the dynamics. Over most of the zonal width of the DEBCs, the vorticity balanc

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48

Goldsworth, Fraser W., David P. Marshall, and Helen L. Johnson. "Symmetric Instability in Cross-Equatorial Western Boundary Currents." Journal of Physical Oceanography 51, no. 6 (2021): 2049–67. http://dx.doi.org/10.1175/jpo-d-20-0273.1.

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AbstractThe upper limb of the Atlantic meridional overturning circulation draws waters with negative potential vorticity from the Southern Hemisphere into the Northern Hemisphere. The North Brazil Current is one of the cross-equatorial pathways in which this occurs: upon crossing the equator, fluid parcels must modify their potential vorticity to render them stable to symmetric instability and to merge smoothly with the ocean interior. In this work a linear stability analysis is performed on an idealized western boundary current, dynamically similar to the North Brazil Current, to identify fea

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49

Hammerl, G., H. Bielefeldt, B. Goetz, et al. "Doping-induced enhancement of grain boundary critical currents." IEEE Transactions on Appiled Superconductivity 11, no. 1 (2001): 2830–37. http://dx.doi.org/10.1109/77.919652.

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Shimada, Koji, and Atsushi Kubokawa. "Nonlinear Evolution of Linearly Unstable Barotropic Boundary Currents." Journal of Physical Oceanography 27, no. 7 (1997): 1326–48. http://dx.doi.org/10.1175/1520-0485(1997)027<1326:neolub>2.0.co;2.

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