Articles | Volume 22, issue 1
https://doi.org/10.5194/os-22-459-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-22-459-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
A realistic physical model of the Gibraltar Strait
Axel Tassigny
LEGI UMR5519, Univ. Grenoble Alpes, CNRS, Grenoble INP, Grenoble, 38000, France
Stef L. Bardoel
LEGI UMR5519, Univ. Grenoble Alpes, CNRS, Grenoble INP, Grenoble, 38000, France
Thomas Valran
LEGI UMR5519, Univ. Grenoble Alpes, CNRS, Grenoble INP, Grenoble, 38000, France
Samuel Viboud
LEGI UMR5519, Univ. Grenoble Alpes, CNRS, Grenoble INP, Grenoble, 38000, France
Louis Gostiaux
CNRS, Ecole Centrale de Lyon, INSA Lyon, Universite Claude Bernard Lyon 1, LMFA, UMR5509, 69130, Ecully, France
Joël Sommeria
LEGI UMR5519, Univ. Grenoble Alpes, CNRS, Grenoble INP, Grenoble, 38000, France
Lucie Bordois
Service Hydrographique et Océanographique de la Marine (SHOM), Brest, France
Xavier Carton
University Brest, CNRS, Ifremer, IRD, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Plouzané, France
Maria Eletta Negretti
CORRESPONDING AUTHOR
LEGI UMR5519, Univ. Grenoble Alpes, CNRS, Grenoble INP, Grenoble, 38000, France
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Fabius Kouogang, Ariane Koch-Larrouy, Xavier Carton, and Moacyr Araujo
EGUsphere, https://doi.org/10.5194/egusphere-2025-6390, https://doi.org/10.5194/egusphere-2025-6390, 2025
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Our research investigates how large waves travel deep within the ocean. Using a detailed computer model, we show that when these deep waves meet giant ocean whirlpools, their path is dramatically changed. They can be bent off course, split apart, or stopped completely. An underwater mountain works with these whirlpools to transfer the wave energy between different ocean layers. Understanding this process is vital because it controls ocean mixing.
Adèle Moncuquet, Nicole L. Jones, Lucie Bordois, François Dufois, and Pascal Lazure
Ocean Sci., 21, 3375–3395, https://doi.org/10.5194/os-21-3375-2025, https://doi.org/10.5194/os-21-3375-2025, 2025
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Internal waves along the Bay of Biscay coast transport water distinctly: surface and seafloor water moves shoreward while mid-depth water moves offshore, matching linear internal tide theory. This transport equals effects of moderate winds that typically dominate. Internal waves were the main transport at one site and enhanced shoreward flow near the seabed at another. Understanding these patterns could explain movement of nutrients, sediments, and pollutants affecting coastal ecosystems.
Cited articles
Aagaard, K., Coachman, L., and Carmack, E.: On the halocline of the Arctic Ocean, Deep Sea Research Part A. Oceanographic Research Papers, 28, 529–545, https://doi.org/10.1016/0198-0149(81)90115-1, 1981. a
Armi, L.: The hydraulics of two flowing layers with different densities, Journal of Fluid Mechanics, 163, 27–58, https://doi.org/10.1017/S0022112086002197, 1986. a, b
Baringer, M. and Price, J.: Mixing and Spreading of the Mediterranean Outflow, J. Phys. Ocean., 27, 1654–77, 1997. a
Baringer, M. and Price, J.: A review of the physical oceanography of the Mediterranean outflow, Marine Geology, 155, 63–82, https://doi.org/10.1016/S0025-3227(98)00141-8, 1999. a
Bordois, L. and Dumas, F.: protevs GIB20 – camarinal sill, SEANOE [data set], https://doi.org/10.17882/93129, 2020. a, b, c, d
Brandt, P., Alpers, W., and Backhaus, J.: Study of the generation and propagation of internal waves in the Strait of Gibraltar using a numerical model and synthetic aperture radar images of the European ERS 1 satellite, Journal of Geophysical Research, 101, 14237, https://doi.org/10.1029/96JC00540, 1996. a
Candela, J., Winant, C. D., and Ruiz, A.: Tides in the Strait of Gibraltar, Journal of Geophysical Research: Oceans, 95, 7313–7335, 1990. a
Danabasoglu, G., Large, W., and Briegleb, B.: Climate impacts of parametrized Nordic Sea overflows, J. Geophys. Res., 115, C11005, https://doi.org/10.1029/2010JC006243, 2010. a, b, c
Daviero, G., Roberts, P., and Maile, K.: Refractive index matching in large-scale stratified experiments, Experiments in Fluids, 31, 119–126, https://doi.org/10.1007/s003480000260, 2001. a
Echevarria, F., Garcia Lafuente, J., Bruno, M., Gorsky, G., Goutx, M., Gonzalez, N., Garcia, C. M., Gomez, F., Vargas, J., Picheral, M., Striby, L., Varela, M., Alonso, J., Reul, A., Cozar, A., Prieto, L., Sarhan, T., Plaza, F., and Jimenez-Gomez, F.: Physical-biological coupling in the Strait of Gibraltar, Deep Sea Research Part II: Topical Studies in Oceanography, 49, 4115–4130, https://doi.org/10.1016/S0967-0645(02)00145-5, 2002. a
Farmer, D. and Armi, L.: Stratified flow over topography: the role of small scale entrainment and mixing in flow establishment, Proc. R. Soc. Lond., 455, 3221–3258, 2001. a
Farmer, D. M. and Armi, L.: The flow of Atlantic water through the Strait of Gibraltar, Progress in Oceanography, 21, 1–103, https://doi.org/10.1016/0079-6611(88)90055-9, 1988. a, b
Ferrari, R. and Wunsch, P.: Ocean Circulation Kinetic Energy: Reservoirs, Sources, and Sinks, Ann. Rev. Fl. Mech., 41, 253–282, 2009. a
Ferrari, R., Mashayek, A., and McDougall, T. E. A.: Turning Ocean Mixing Upside Down, J. Phys. Ocean., 46, 2239–2261, 2016. a
Fouli, H. and Zhu, D.: Interfacial waves in two-layer exchange flows downslope of a bottom sill, Journal of Fluid Mechanics, 680, 194–224, https://doi.org/10.1017/jfm.2011.155, 2011. a, b
Gačić, M., Ursella, L., Kovačević, V., Menna, M., Malačič, V., Bensi, M., Negretti, M.-E., Cardin, V., Orlić, M., Sommeria, J., Viana Barreto, R., Viboud, S., Valran, T., Petelin, B., Siena, G., and Rubino, A.: Impact of dense-water flow over a sloping bottom on open-sea circulation: laboratory experiments and an Ionian Sea (Mediterranean) example, Ocean Sci., 17, 975–996, https://doi.org/10.5194/os-17-975-2021, 2021. a
García-Lafuente, J., Delgado, J., Vargas, J., Vargas, M., Plaza, F., and Sarhan, T.: Low-frequency variability of the exchanged flows through the Strait of Gibraltar during CANIGO, Deep Sea Research Part II: Topical Studies in Oceanography, 49, 4051–4067, https://doi.org/10.1016/S0967-0645(02)00142-X, 2002a. a, b, c, d
García-Lafuente, J., Fanjul, E. A., Vargas, J., and Ratsimandresy, A.: Subinertial variability in the flow through the Strait of Gibraltar, Journal of Geophysical Research: Oceans, 107, 3168, https://doi.org/10.1029/2001JC001104, 2002b. a, b
García-Lafuente, J., Sánchez Román, A., Díaz del Río, G., Sannino, G., and Sánchez Garrido, J. C.: Recent observations of seasonal variability of the Mediterranean outflow in the Strait of Gibraltar, Journal of Geophysical Research: Oceans, 112, https://doi.org/10.1029/2006JC003992, 2007. a
García-Lafuente, J., Bruque Pozas, E., Sánchez-Garrido, J. C., Sannino, G., and Sammartino, S.: The interface mixing layer and the tidal dynamics at the eastern part of the Strait of Gibraltar, Journal of Marine Systems, 117–118, 31–42, 2013. a
García-Lafuente, J., Sammartino, S., Sánchez-Garrido, J. C., and Naranjo, C.: Asymmetric baroclinic response to tidal forcing along the main sill of the Strait of Gibraltar inferred from mooring observations, The Ocean in Motion, Spinger, Cham, 193–210, https://doi.org/10.1007/978-3-319-71934-4_14, 2018. a, b
Gasser, M., Pelegri, J. L., Emelianov, M., Bruno, M., Gracia, E., Pastor, M., Peters, H., Rodriguez-Santana, A., Salvador, J., and Sanchez-Leal, R. F.: Tracking the Mediterranean outflow in the Gulf of Cadiz, Progress in Oceanography, 157, 47–71, https://doi.org/10.1016/j.pocean.2017.05.015, 2017. a
Helfrich, K. R.: Time-Dependent Two-Layer Hydraulic Exchange Flows, Journal of Physical Oceanography, 25, 359–373, https://doi.org/10.1175/1520-0485(1995)025<0359:TDTLHE>2.0.CO;2, 1995. a, b
Hilt, M., Auclair, F., Benshila, R., Bordois, L., Capet, X., Debreu, L., Dumas, F., Jullien, S., Lemarié, F., Marchesiello, P., Nguyen, C., and Roblou, L.: Numerical modelling of hydraulic control, solitary waves and primary instabilities in the Strait of Gibraltar, Ocean Modelling, 151, 101642, https://doi.org/10.1016/j.ocemod.2020.101642, 2020. a, b, c, d, e
Hussain, A. K. M. F. and Reynolds, W. C.: The mechanics of an organized wave in turbulent shear flow, J. Fluid Mech., 41, 241–258, https://doi.org/10.1017/S0022112070000605, 1970. a
Izquierdo, A., Tejedor, L., Sein, D., Backhaus, J., Brandt, P., Rubino, A., and Kagan, B.: Control Variability and Internal Bore Evolution in the Strait of Gibraltar: A 2-D Two-Layer Model Study, Estuarine, Coastal and Shelf Science, 53, 637–651, https://doi.org/10.1006/ecss.2000.0706, 2001. a, b
Jia, Y.: Formation of an Azores Current due to Mediterranean overflow in a modeling study of the North Atlantic, J. Phys. Oceanogr., 30, 2342–2358, 2000. a
Käse, R., Girton, J., and Sanford, T.: Structure and variability of the Denmark Strait Overflow: Model and observations, J. Phys. Ocean., 108, https://doi.org/10.1029/2002JC001548, 2003. a
Lawrence, G. A.: On the hydraulics of Boussinesq and non-Boussinesq two-layer flows, Journal of Fluid Mechanics, 215, 457, https://doi.org/10.1017/S0022112090002713, 1990. a, b
Lawrence, G. A.: The hydraulics of steady two-layer flow over a fixed obstacle, Journal of Fluid Mechanics, 254, 605–633, https://doi.org/10.1017/S0022112093002277, 1993. a, b
Mercier, M. J., Gostiaux, L., Helfrich, K., Sommeria, J., Viboud, S., Didelle, H., Ghaemsaidi, S. J., Dauxois, T., and Peacock, T.: Large-scale, realistic laboratory modeling of M2 internal tide generation at the Luzon Strait, Geophysical Research Letters, 40, 5704–5709, https://doi.org/10.1002/2013GL058064, 2013. a
Muench, R., Padman, L., Gordon, A., and Orsi, A.: A dense water outflow from the Ross Sea, Antarctica: Mixing and the contribution of tides, Journal of Marine Systems, 77, 369–387, https://doi.org/10.1016/j.jmarsys.2008.11.003, 2009. a
Naranjo, C., García-Lajuente, J., Sannino, G., and Sanchez-Garrido, J.: How much do tides affect the circulation of the Mediterranean Sea? From local processes in the Strait of Gibraltar to basin-scale effects, Progress in Oceanography, 127, 108–116, 2014. a
Naranjo, C., Sammartino, S., García-Lafuente, J., Bellanco, M. J., and Taupier-Letage, I.: Mediterranean waters along and across the Strait of Gibraltar, characterization and zonal modification, Deep Sea Research Part I: Oceanographic Research Papers, 105, 41–52, https://doi.org/10.1016/j.dsr.2015.08.003, 2015. a
Negretti, M., Martin, A., and Naaim-Bouvet, F.: Simultaneous velocity–density measurements of downslope density clouds, Advances in Water Resources, 164, 104215, https://doi.org/10.1016/j.advwatres.2022.104215, 2022. a, b, c
Negretti, M. E., Zhu, D., and Jirka, G.: Barotropically induced interfacial waves in a two-layer stratified exchange flow down a sill, J. Fluid Mech., 592, 135–154, 2007a. a
Negretti, M. E., Zhu, D. Z., and Jirka, G. H.: Barotropically induced interfacial waves in two-layer exchange flows over a sill, Journal of Fluid Mechanics, 592, 135–154, https://doi.org/10.1017/S0022112007008324, 2007b. a
Negretti, M. E., Socolofsky, S. A., and Jirka, G. H.: Linear stability analysis of inclined two-layer stratified flows, Physics of Fluids, 20, 094104, https://doi.org/10.1063/1.2980351, 2008a. a
Negretti, M. E., Zhu, D., and Jirka, G.: The effect of bottom roughness in two-layer flows down a slope, Dyn. Oceans Atm., 45, 46–68, 2008b. a
Negretti, M. E., Flòr, J.-B., and Hopfinger, E. J.: Development of gravity currents on rapidly changing slopes, Journal of Fluid Mechanics, 833, 70–97, https://doi.org/10.1017/jfm.2017.696, 2017. a, b, c, d
Negretti, M. E., Tucciarone, F. L., and Wirth, A.: Intruding gravity currents and re-circulation in a rotating frame: Laboratory experiments, Phys. Fluids, 33, 096607, https://doi.org/10.1063/5.0058629, 2021. a
Odier, P., Chen, J., and Ecke, R.: Entrainment and mixing in a laboratory model of oceanic overflow, J. Fluid Mech., 746, 498–535, 2014. a
Pawlak, G. and Armi, L.: Stability and mixing of a two-layer exchange flow, Dynamics of Atmospheres and Oceans, 24, 139–151, https://doi.org/10.1016/0377-0265(95)00447-5, 1996. a
Peliz, A., Dubert, J., Marchesiello, P., and Teles-Machado, A.: Surface circulation in the Gulf of Cadiz: Model and mean flow structure, Journal of Geophysical Research: Oceans, 112, https://doi.org/10.1029/2007JC004159, 2007. a
Peters, H. and Johns, W.: Mixing and entrainment in the Red Sea outflow plume. Part II: Turbulence characteristics, J. Phys. Oceanogr., 35, 584–600, 2005. a
Pierini, S., De Ruggiero, P., Negretti, M., Sommeria, J., Schiller Weiss, I., Weiffenbach, J., and Dijkstra, H.: Laboratory experiments reveal self-sustained intrinsic oscillations in ocean relevant rotating fluid flows, Nature Sci. Rep., 12, 1375, https://doi.org/10.1038/s41598-022-05094-1, 2022. a
Pirro, A., Menna, M., Mauri, E., Laxenaire, R., Salon, S., Bosse, A., Martellucci, R., Viboud, S., Valran, T., Hayes, D., Speich, S., Poulain, P., and Negretti, M.: Rossby waves driven by the Mid Mediterranean Jet impact the Eastern Mediterranean mesoscale dynamics, Nature Sci. Rep., 14, 29598, https://doi.org/10.1038/s41598-024-80293-6, 2024. a
Prastowo, T., Griffiths, R., Hughes, G., and Hogg, A.: Mixing in exchange flows through a contraction, Proceedings of International Symposium on Stratified Flows 2006, University of Western Australia, 7 pp., 2006. a
Pratt, L. J.: Hydraulic Control of Sill Flow with Bottom Friction, Journal of Physical Oceanography, 16, 1970–1980, https://doi.org/10.1175/1520-0485(1986)016<1970:HCOSFW>2.0.CO;2, 1986. a
Pratt, L. J. and Helfrich, K.: Generalized Conditions for Hydraulic Criticality of Oceanic Overflows, Journal of Physical Oceanography, 35, 1782–1800, https://doi.org/10.1175/JPO2788.1, 2005. a
Price, J. and O'Neil Baringer, M.: Outflows and deep water production by marginal seas, Progress in Oceanography, 33, 161–200, 1994. a
Reid, J.: On the contribution of the Mediterranean Sea outflow to the Norwegian-Greenland Sea, Deep Sea Res. Part A Oceanogr. Res. Pap., 26, 1199–1223, 1979. a
Rogerson, M., Rohling, E. J., Bigg, G. R., and Ramirez, J.: Paleoceanography of the Atlantic-Mediterranean exchange: Overview and first quantitative assessment of climatic forcing, Rev. Geophys., 50, RG2003, https://doi.org/10.1029/2011RG000376, 2012. a
Roustan, J.-B., Bordois, L., Dumas, F., Auclair, F., and Carton, X.: In Situ Observations of the Small-Scale Dynamics at Camarinal Sill—Strait of Gibraltar, Journal of Geophysical Research: Oceans, 128, e2023JC019738, https://doi.org/10.1029/2023JC019738, 2023. a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s
Roustan, J.-B., Bordois, L., Garciá-Lafuente, J., Dumas, F., Auclair, F., and Carton, X.: Evidence of Reflected Internal Solitary Waves in the Strait of Gibraltar, Journal of Geophysical Research: Oceans, 129, e2023JC020152, https://doi.org/10.1029/2023JC020152, 2024a. a, b, c, d
Roustan, J.-B., Bouruet-Aubertot, P., Bordois, L., Cuypers, Y., Carton, X., Dumas, F., and Auclair, F.: Turbulence Over Camarinal Sill and Its Impact on Water Mixing—Strait of Gibraltar, Journal of Geophysical Research: Oceans, 129, e2023JC020709, https://doi.org/10.1029/2023JC020709, 2024b. a, b, c, d, e, f
Rubino, A., Gacic, M., Bensi, M., Kovacevic, V., Malacic, V., Menna, M., Negretti, M. E., Sommeria, J., Zanchettin, D., Barreto, R. V., Ursella, L., Cardin, V., Civitarese, G., Orli?, M., Petelin, B., and Siena, G.: Experimental evidence of long-term oceanic circulation reversals without wind influence in the North Ionian Sea, Sci. Rep., 10, 1905, https://doi.org/10.1038/s41598-020-57862-6, 2020. a
Rétif, S., Negretti, M., and Wirth, A.: On the vertical density structure of intruding rotating gravity currents, Nature Comm., 14, 10274, https://doi.org/10.1038/s41598-024-60878-x, 2024. a
Sánchez-Garrido, J., Sannino, G., Liberti, L., García-Lafuente, J., and Pratt, L.: Numerical modeling of three-dimensional stratified tidal flow over Camarinal Sill, Strait of Gibraltar, Journal of Geophysical Research: Oceans, 116, C12026, https://doi.org/10.1029/2011JC007093, 2011. a, b, c, d
Sanchez-Roman, A., Jorda, G., Sannino, G., and Gomis, D.: Modelling study of transformations of the exchange flows along the Strait of Gibraltar, Ocean Sci., 14, 1547–1566, https://doi.org/10.5194/os-14-1547-2018, 2018. a, b
Sannino, G., Bargagli, A., and Artale, V.: Numerical modeling of the mean exchange through the Strait of Gibraltar, Journal of Geophysical Research: Oceans, 107, 9–1–9–24, https://doi.org/10.1029/2001JC000929, 2002. a
Sannino, G., Pratt, L., and Carillo, A.: Hydraulic Criticality of the Exchange Flow through the Strait of Gibraltar, Journal of Physical Oceanography, 39, 2779–2799, https://doi.org/10.1175/2009JPO4075.1, 2009. a, b, c
Sannino, G., Sanchez Garrido, J. C., Liberti, L., and Pratt, L.: Exchange Flow through the Strait of Gibraltar as Simulated by a σ-Coordinate Hydrostatic Model and a z-Coordinate Non-hydrostatic Model, chap. 3, American Geophysical Union (AGU), 25–50, ISBN 9781118847572, https://doi.org/10.1002/9781118847572.ch3, 2014. a, b
Shi, H., Negretti, M., Chauchat, J., Blanckaert, K., Lemmin, U., and Barry, D.: Unconfined Plunging Process of a Hyperpycnal River Flowing into a Lake: Laboratory Experiments and Numerical Modelling, Water Res. Research, 58, https://doi.org/10.1029/2022WR032633, 2022. a
Smeed, D. A.: Hydraulic Control of Three-Layer Exchange Flows: Application to the Bab al Mandab, Journal of Physical Oceanography, 30, 2574–2588, https://doi.org/10.1175/1520-0485(2000)030<2574:HCOTLE>2.0.CO;2, 2000. a
Soto-Navarro, J., Criado-Aldeanueva, F., García-Lafuente, J., and Sánchez-Román, A.: Estimation of the Atlantic inflow through the Strait of Gibraltar from climatological and in situ data, J. of Geophys. Res.-Oceans, 115, https://doi.org/10.1029/2010JC006302, 2010. a, b
Sous, D., Sommeria, J., and Boyer, D.: Friction law and turbulent properties in a laboratory Ekman boundary layer, Physics of Fluids, 25, 046602, https://doi.org/10.1063/1.4802045, 2013. a
Tassigny, A., Negretti, M., and Wirth, A.: Dynamics of intrusion in downslope gravity currents in a rotating frame, Phys. Rev. Fluids, 9, 074605, https://doi.org/10.1103/PhysRevFluids.9.074605, 2024. a
Tsimplis, M. and Bryden, H.: Estimation of the transports through the Strait of Gibraltar, Deep Sea Research Part I: Oceanographic Research Papers, 47, 2219–2242, https://doi.org/10.1016/S0967-0637(00)00024-8, 2000. a, b
Turner, J.: in: Buoyancy effects in fluids, Cambridge University Press, ISBN 9780511608827, https://doi.org/10.1017/CBO9780511608827, 1973. a, b
Vic, C., Roullet, G., Capet, X., Carton, X., Molemaker, M., and Gula, J.: Eddy topography interactions and the fate of the Persian Gulf Outflow, J. Geophys. Res.-Oceans, 120, 6700–17, https://doi.org/10.1002/2015JC011033, 2016. a
Wirth, A.: On the hydrostatic approximation in rotating stratified flow, Nonlin. Processes Geophys., 32, 261–280, https://doi.org/10.5194/npg-32-261-2025, 2025. a
Editorial statement
This is an interesting study using a large rotating tank in the laboratory to simulate the flow through the Strait of Gibraltar. Laboratory experiments in geophysical fluid dynamics are increasingly rare, yet are highly visual and stimulating. The results are of high impact for understanding the processes such as tides determining the exchange between the Mediterranean and the Atlantic.
This is an interesting study using a large rotating tank in the laboratory to simulate the flow...
Short summary
This study uses a realistic laboratory model to reveal how tides and topography shape the exchange of waters at the Strait of Gibraltar. The experiments show when, where and why strong dilution occurs, and how and why conditions change between spring and neap tides. The results give new insight into a complex passage that links the Atlantic and Mediterranean, improving our ability to understand and predict its behavior.
This study uses a realistic laboratory model to reveal how tides and topography shape the...