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Discussion papers
https://doi.org/10.5194/os-2018-107
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2018-107
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 04 Oct 2018

Research article | 04 Oct 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

Characterization of bottom sediment resuspension events observed in a micro-tidal bay

Manel Grifoll1,2, Pablo Cerralbo1,2, Jorge Guillén3, Manuel Espino1,2, Lars Boye Hansen4, and Agustín Sánchez-Arcilla1,2 Manel Grifoll et al.
  • 1Laboratori d’Enginyeria Marítima, Universitat Politècnica de Catalunya (UPC-BarcelonaTech), Barcelona, 08034, Spain
  • 2Centre Internacional d’Investigació dels Recursos Costaners (CIIRC), Barcelona, 08034, Spain
  • 3Institu de Ciències del Mar (ICM-CSIC), Barcelona, 08003, Spain
  • 4DHI-Gras, Horsholm, DK-2970, Denmark

Abstract. In this contribution we investigate the origin of the variability in near-bottom turbidity observations in the Alfacs Bay (NW Mediterranean Sea). This bay is characterized by a micro-tidal environment and a relevant seiching activity which may lead to flow velocities of more than 50cms−1. A set of current meters and optical sensors mounted near the sea bottom were used to acquire synchronous hydrodynamic and optical information of the water column. The time-series observations showed an evident relation between seiche activity and sediment resuspension events. The observations of turbidity peaks are consistent with the node/anti-node location for the fundamental and first resonance periods of the bay. The implementation of a coupled wave-current numerical model shows a strong spatial variability of the potential resuspension locations. Strong wind events are also a mechanism responsible of the resuspension of fine sediment within the bay. This is confirmed using retrieval of suspended sediment concentration from Sentinel-2 data. We suggest that the sequence of resuspension events plays a relevant role in SSC, in such a way that previous sediment resuspension events may influence the increase of suspended sediment in subsequents events. The suspended sediment events likely affect the ecological status of the Bay and the sedimentary process at long-term period.

Manel Grifoll et al.
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In this contribution we investigate the origin of the variability in near-bottom turbidity observations in the Alfacs Bay (NW Mediterranean Sea). The observations of turbidity peaks are consistent with the Seiche phenomena. We suggest that the sequence of resuspension events plays a relevant role in SSC, in such a way that previous sediment resuspension events may influence the increase of suspended sediment in subsequents events.
In this contribution we investigate the origin of the variability in near-bottom turbidity...
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