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Subaqueous Dunes Over Sand Ridges on the Murcia Outer Shelf

  • R. DuránEmail author
  • J. Guillén
  • J. Rivera
  • A. Muñoz
  • F. J. Lobo
  • L. M. Fernández-Salas
  • J. Acosta
Chapter

Abstract

Multibeam swath bathymetry, high-resolution seismic data and sediment samples were used to characterize a field of sand ridges and subaqueous dunes on the outer Murcia continental shelf (western Mediterranean Sea). Sand ridges are 1.5–3 m high and show a predominant E-W orientation oblique to the present-day shoreline. High-resolution seismic data reveal a backstepping stacking pattern of high-angle clinoforms dipping towards the southwest, interpreted as buried sand bodies. Subaqueous dunes have a mean height of 0.3 m and appear superimposed on the sand ridges showing a NW-SE orientation oblique to the ridges. They are composed of sandy sediments and display asymmetric morphology, with the lee side towards the southwest. Ridge and dune asymmetry and internal structure are indicative of long-term sediment transport towards the southwest. At present, dune migration rates deduced from repeated bathymetric surveys indicate that the dunes remain stationary or migrate at very low rates on a decadal scale.

Keywords

Sand ridges Subaqueous dunes Tideless continental shelf Western mediterranean sea 

Notes

Acknowledgments

This work is a contribution to the Spanish projects FORMED (CGL2012-33989). The authors wish to thank the Secretaría General de Pesca and Tragsa for the 2003 Espace Project dataset and the Spanish Oceanographic Institute for the ship time of the Copesands cruise. R. Durán is supported by a CSIC JAE-Doc contract co-funded by the FSE.

References

  1. Acosta, J., Fontán, A., Muñoz, A., Muñoz-Martín, A., Rivera, J., Uchupi, E. (2013). The morpho-tectonic setting of the Southeast margin of Iberia and the adjacent oceanic Algero-Balearic Basin. Mar. Pet. Geol. 45, 17–41.Google Scholar
  2. Ashley, G.M. (1990). Classification of large-scale subaqueous bedforms: a new look at an old problem. SEMP Bedforms and Bedding Structures Research Symposium. J. Sediment. Petr. 60, 160–172.Google Scholar
  3. Bassetti, M.A., Jouet, G., Dufois, F., Berné, S., Rabineau, M., Taviani, M. (2006). Sand bodies at the shelf edge in the Gulf of Lions (western Mediterranean): deglacial history and modern processes. Mar. Geol. 234, 93–109.Google Scholar
  4. Calvete, D., Falqués, A., de Swart, H. E., Walgreen, M. (2001). Modelling the formation of shoreface-connected sand ridges on storm-dominated inner shelves. J. Fluid Mech. 441,169–193.Google Scholar
  5. Durán, R., Guillén, J., Simarro, G., Ribo, M., Puig, P., Muñoz, A., Palanques, A. (2015). Sand ridges in the mid-outer shelf as potential sand borrows areas (NE Mediterranean). Proceedings of the Coast. Sediments 2015, 1–13.Google Scholar
  6. Fernández-Salas, L. M., Durán, R., Mendes, I., Galparsoro, I., Lobo, F. J., Bárcenas, P., Rosa, F., Ribó, M., García-Gil, S., Ferrín, A., Carrara, G., Roque, C., Canals, M. (2015). Shelves of the Iberian Peninsula and the Balearic Islands (I): Morphology and sediment types. Boletín Geológico y Minero 126, 327–376.Google Scholar
  7. Goff, J.A., Austin, Jr., Gulick, S., Nordfjord, S., Christensen, B., Sommerfield, C., Olson, H., Alexander, C. (2005). Recent and modern marine erosion on the New Jersey outer shelf. Mar. Geol. 216, 275–296.Google Scholar
  8. Goff, J.A., Duncan, L.S. (2012). Re-examination of sand ridges on the middle and outer New Jersey shelf based on combined analysis of multibeam bathymetry and backscatter, seafloor grab and chirp seismic data. Int. As. Sed. 44, 121–142.Google Scholar
  9. Knaapen, M. A F. (2005). Sandwave migration predictor based on shape information. J. Geophys. Res. Earth Surf. 110, 1–9.Google Scholar
  10. Li, Z., King, E.L. (2007). Multibeam bathymetric investigations of the morphology of sand ridges and associated bedforms and their relation to storm processes, Sable Island Bank, Scotian Shelf. Mar. Geol. 243, 200–228.Google Scholar
  11. Liu, Z.X., Yin, P., Xiong, Y.Q., Berne, S., Trentesaux, A., Li, C.X. (2003). Quaternary transgressive and regressive depositional sequences in the East China Sea. Chinese Science Bulletin 48 (Suppl.), 81–87.Google Scholar
  12. Lo Iacono, C., Guillén, J., Puig, P., Ribó, M., Ballesteros, M., Palanques, A., Farrán, M., Acosta, J. (2010). Large-scale bedforms along a tideless outer shelf setting in the western Mediterranean. Cont. Shelf Res. 30, 1802–1813.Google Scholar
  13. Lobo, F.J., Hernández-Molina, F.J., Somoza, L., Rodero, J., Maldonado, A., Barnolas, A. (2000). Patterns of bottom current flow deduced from dune asymmetries over the Gulf of Cadiz shelf (southwest Spain). Mar. Geol. 164, 91–117.Google Scholar
  14. Lobo, F.J., Durán, R., Roque, C., Ribó, M., Carrara, G., Mendes, I., Ferrín, A. (2015). Shelves around the Iberian Peninsula (II): Evolutionary sedimentary patterns. Boletín Geológico y Minero 126, 377–408.Google Scholar
  15. Millot, C. (1999). Circulation in the Western Mediterranean sea. J. Marine Syst. 20, 423–442.Google Scholar
  16. Nnafie, A., de Swart, H.E., Calvete, D., Garnier, R. (2014). Effects of sea level rise on the formation and drowning of shoreface-connected sand ridges, a model study. Cont. Shelf. Res. 80, 32–48.Google Scholar
  17. Simarro, G., Guillén, J., Puig, P., Ribó, M., Lo Iacono, C., Palanques, A., Muñoz, A., Durán, R., Acosta, J. (2015). Sediment dynamics over sand ridges on a tideless mid-outer continental shelf. Mar. Geol. 361, 25–40.Google Scholar
  18. Snedden, J.W., Tillman,R. W., Culver, S.J. (2011). Genesis and evolution of a mid-shelf, storm-built sand ridge, New Jersey continental shelf, U.S.A. J. Sediment. Res. 81, 534–552.Google Scholar

Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  • R. Durán
    • 1
    Email author
  • J. Guillén
    • 1
  • J. Rivera
    • 2
  • A. Muñoz
    • 3
  • F. J. Lobo
    • 4
  • L. M. Fernández-Salas
    • 5
  • J. Acosta
    • 2
  1. 1.Insituto de Ciencias del Mar (CSIC)BarcelonaSpain
  2. 2.Instituto Español de OceanografiaIEOMadridSpain
  3. 3.Tragsa-SGPMadridSpain
  4. 4.Instituto Andaluz de Ciencias de la Tierra (CSIC-Universidad de Granada)Armilla GranadaSpain
  5. 5.Instituto Español de OceanografíaCentro Oceanográfico de CádizCádizSpain

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