Garel, Erwan

Principal invited researcher (IF-FCT)
Centre for Marine and Environmental Research (CIMA)
University of Algarve (Faro), Campus de Gambelas, Building 7, Office 1.88

Key words: Coastal dynamics; Transitional Systems; Coastal Oceanography; Environmental Monitoring

Additional Info

  • Bio:

    Erwan Garel obtained his PhD in Marine Geosciences at the European University Institute for the Sea (Brest, France) in 2001. After 2 years (2001-2003) of teaching Geology at French Universities (Brest and Le Mans), he was a postdoc fellow (2003-2006) at the National Oceanographic Centre, Southampton (UK). In 2007, E. Garel was employed as a Marine Geologist at the Institute of Geosciences, Kiel University (Germany). In 2008-2015, E. Garel joined CIMA (Algarve University) as a post-doc fellow. In 2015, he was contracted as an Invited Principal Research Scientist (FCT-Investigador) to develop a 5 years research program about estuarine eco-hydrodynamics at CIMA. Since 2016, he is a member of CIMA steering committee.

  • Interests:


    Throughout his career, Erwan Garel has carried out observational studies related to hydrodynamics and sediment transport in various coastal areas. 

  • Activities:


    Coastal circulation

    This research is devoted to the water circulation at the extremity of Eastern boundary coastal upwelling systems, in particular the Northern Shelf of the Gulf of Cadiz. 

    This activity is supported by multiyear (2008-now) ADCP data collected at 5 stations along the South Portuguese coast (20 m water depth), in collaboration with CCMAR and IPMA.


    The dynamics of narrow estuaries

    This research line is mainly conducted at the Guadiana Estuary, where he studies the tidal dynamics and exchange flow processes between the estuarine system and the adjacent sea.

    This activity is supported by long-term (2008-now) current and water monitoring at the Guadiana Estuary (SIMPATICO buoy). 


    Morphodynamics of ebb-tidal deltas

    This research line specifically addressest the growth of ebb-tidal deltas towards equilibrium and the associated bypassing processes.

    This activitiy is supported by yearly bathymetric surveys of the Guadiana ebb-tidal delta (2014-now).

  • Additional Information: ORCID ID: 0000-0002-4584-9759 ResearcherID: N-9811-2014
  • Publications:



    - Morales JA and Garel E, 2019. The Guadiana River Delta, Editions Springer Nature. In: The Spanish Coastal Systems, JA Morales (Ed.). doi: 10.1007/978-3-319-93169-2_24.

    - Garel E, 2017. Present Dynamics of the Guadiana Estuary. In: Moura, D., Gomes, A., Mendes, I. & Anílbal, J. (eds.), Guadiana River estuary - Investigating the past, present and future. 1st edition. University of Algarve. Faro, ISBN 978-989-8859-18-1, pp. 15-37. DOI:

    - Garel E, Bonne W, Collins MB, 2009. Offshore Sand and Gravel Mining, In Encyclopedia of Ocean Sciences (Second Edition), edited by John H. Steele, Academic Press, Oxford, Pages 182-190, ISBN 9780123744739,




    - Cai H, Zhang P, Garel E, Matte P, Hu S, Liu F, Yang Q. A novel approach for the assessment of morphological evolution based on observed water levels in tide-dominated estuaries, Hydrology and Earth System Sciences Discussions, hess-2019-661, Under Review

    - Correia C, Torres AF, Rosa A, Cravo A, Jacob J, J ú nior L, Garel E. Export of dissolved and suspended matter from the main estuaries in south Portugal during winter conditions, Marine Chemistry, Under Review.

    - Lopez-Ruiz A, Garel E, Ferreira O., 2020. The effects of high river discharges on the morphodynamics of the Guadiana ebb-tidal delta. Accepted in Journal of Coastal Research.


    - Cai H, Savenije HHG, Garel E, Zhang X, Guo L, Zhang M, Liu F, Yang Q. 2019. Seasonal behaviour of tidal damping and residual water level slope in the Yangtze River estuary: identifying the critical position and river discharge for maximum tidal damping. Hydrol. Earth Syst. Sci. 23: 2779-2794. DOI: 10.5194/hess-23-2779-2019

    - Garel E, Ruiz-Lopez A, Ferreira O. A method to estimate the longshore sediment transport at ebb‐tidal deltas based on their volumetric growth: application to the Guadiana (Spain‐Portugal border). Earth Surface Processes and Landforms, In Press,

    - Almeida LP, Almar R, Bergsma E, Berthier E, Baptista PB, Garel E, Dada Oand Alves B. High resolution coastal topography from satellite stereo imagery, Remote Sensing, 11(5), 590.

    - Morais, P., Gaspar, M., Garel, E., Baptista, V., Cruz, J, Cerveira, I., Leitão, F., Teodosio, M. A., 2019. The Atlantic blue crab Callinectes sapidus Rathbun, 1896 expands itsnon-native distribution into the Ria Formosa lagoon and the Guadiana estuary (SW-Iberian Peninsula, Europe). BioInvasions Records, vol. 8.

    - Calero Quesada MC, García-Lafuente J, Garel E, Delgado Cabello J, Martins F, Moreno Navas J., 2019. Effects of tidal and river discharge forcings on tidal propagation along the Guadiana Estuary. Journal of Sea Research. In Press. DOI: 10.1016/j.seares.2019.01.006


    - Cai, H., Toffolon, M., Savenije, H. H. G., Yang, Q., and Garel, E., 2018. Frictional interactions between tidal constituents in tide-dominated estuaries, Ocean Science, 14, 769-782,

    - Pacheco, A., Gorbeña, E., Plomaritis, T.A., Garel, E., Gonçalves, J.M.S., Bentes, L., Monteiro, P., Afonso, C.M.L., Oliveira, F., Soares, C., Zabel, F., Sequeira, C., 2018. Deployment characterization of a floatable tidal energy converter on a tidal channel, Ria Formosa, Portugal. Energy 158, 89-104.

    - Garel E., Cai H., 2018. Effects of tidal-forcing variations on tidal properties along a narrow convergent estuary. Estuaries and Coasts.


    - Garel E, 2017. Efficient dredging strategy for channel maintenance of the Guadiana ebb-delta. Proc. of Coastal Dynamics 2017, Helsingor, Denmark, paper 232, 12 p.

    - Garel E, 2017. Collection and dissemination of data from environmental monitoring systems in estuaries. Proceeding of 4th Experiment@International Conference, Faro, Portugal. IEEE (Eds), 2017, 4p. DOI: 10.1109/EXPAT.2017.7984418

    - Bosnic, I., Cascalho, J., Taborda, R., Drago, T., Hermínio, J., Rosa, M., Dias, J., and Garel, E., 2017, Nearshore sediment transport: Coupling sand tracer dynamics with oceanographic forcing: Marine Geology, v. 385, p. 293-303. Doi: 10.1016/j.margeo.2017.02.004

    - Garel, E., D’Alimonte, D., 2017. Continuous river discharge monitoring with bottom-mounted current profilers at narrow tidal estuaries. Continental Shelf Research 133, 1-12. Doi: 10.1016/j.csr.2016.12.001


    - Garel, E., I. Laiz, T. Drago and P. Relvas. 2016. Characterisation of coastal counter-currents on the inner shelf of the Gulf of Cadiz. Journal of Marine Systems 155: 19-34. doi:10.1016/j.jmarsys.2015.11.001


    - Garel E, Ferreira Ó, 2015. Multi-year high-frequency physical and environmental observations at the Guadiana Estuary. Earth System Science Data, 7(2), 299-309, doi:10.5194/essd-7-299-2015

    - Teodósio M A, Garel E, 2015. Linking hydrodynamics and fish larvae retention in estuarine nursery areas from an ecohydrological perspective. Ecohydrology & Hydrobiology, 15 (4), 182-191. DOI: 10.1016/j.ecohyd.2015.08.003

    - Garel, E., C. Sousa and Ó. Ferreira. 2015. Sand bypass and updrift beach evolution after jetty construction at an ebb-tidal delta. Estuarine, Coastal and Shelf Science 167, Part A: 4-13. doi: 10.1016/j.ecss.2015.05.044


    - Garel E, Camba C, Ferreira Ó, van Koningsveld M, 2014. Environmental State Indicators for impact monitoring of offshore MRE multi-platform projects. Journal of Environmental Management, 141, 16-28. DOI: 10.1016/j.jenvman.2014.02.037

    - Garel E, Sousa C, Ferreira Ó, Morales J, 2014. Decadal morphological response of an ebb-tidal delta and downdrift beach to artificial breaching and inlet stabilisation. Geomorphology 216, 13-25. DOI : 10.1016/j.geomorph.2014.03.031


    - Garel E, Ferreira Ó., 2013. Fortnightly changes in water transport direction across the mouth of a narrow estuary. Estuaries and Coasts, 36 (2), 286-299. DOI: 10.1007/s12237-012-9566-z


    - Garel, E, Ferreira Ó., 2011. Effects of the Alqueva Dam on Sediment Fluxes at the Mouth of the Guadiana Estuary. Journal of Coastal Research, SI 64, 1505-1509.

    - Garel E, Ferreira Ó, 2011. Monitoring estuaries using non-permanent stations: practical aspects and data examples. Ocean Dynamics 61, 891-902. DOI: 10.1007/s10236-011-0417-4

    - Pacheco A, Williams JJ, Ferreira Ó, Garel E, Reynolds S, 2011. Application of Sediment Transport Models to a Multiple Inlet System. Estuarine, Coastal and Shelf Science 95, 119-134. DOI: 10.1016/j.ecss.2011.08.027


    - Briere C, Roos P, Garel E, SJMH Hulsher, 2010. Modelling the morphodynamics of the Kwinte Bank, subject to sand extraction. Journal of Coastal Research, SI 51, 117-126. DOI: 10.2112/SI51-011.1

    - Garel E, 2010. Tidally-averaged currents and bedload transport over the Kwinte Bank, southern North Sea. Journal of Coastal Research, SI 51, 87-94. DOI: 10.2112/SI51-008.1

    - Garel E, Lefebvre A, 2010. Wave-induced sand re-suspension at dredged gravel pits based upon hydrodynamics measurements (Tromper Wiek, Baltic Sea). Journal of Coastal Research, SI 51, 195-204. DOI: 10.2112/SI51-018.1.

    - Pacheco A, Ferreira Ó, Williams JJ, Garel E, Vila-Concejo A, Dias, JA, 2010. Hydrodynamics and Equilibrium of a Multiple Inlet System. Marine Geology, 274: 32-42. DOI: 10.1016/j.margeo.2010.03.003

    - Radzevičius, R., Velegrakis, A., Bonne, W., Kortekaas, S., Garel, E., Blažauskas, N., Asariotis, R., 2010. Marine aggregates extraction: regulation and management in EU member States. Journal of Coastal Research, SI 51, 15-38. DOI: 10.2112/SI51-003.1

    - Van Lancker V, Bonne W, Garel E, Degrendele K, Roche M, Van den Eynde D, Bellec V, Briere C, Collins MB, Velegrakis A, 2010. Recommendations for the sustainable exploitation of tidal sandbanks, 2010. Journal of Coastal Research, SI 51, 151-164. DOI: 10.2112/SI51-014.1


    - Garel E, Nunes S, Neto JM, Fernandes. R, Neves R, Marques JC, Ferreira Ó, 2009. The autonomous Simpatico system for real-time continuous water-quality and current velocity monitoring: examples of application in three Portuguese estuaries. Geo-Marine Letters 29:331-341. DOI: 10.1007/s00367-009-0147-5

    - Garel E, Pinto L, Santos A, Ferreira Ó, 2009. Tidal and river discharge forcing upon water and sediment circulation at a rock-bound estuary (Guadiana estuary, Portugal). Estuarine Coastal and Shelf Science, 84 (2), 269-281. DOI: 10.1016/j.ecss.2009.07.002

    - Liria P, Garel E, Uriarte A, 2009. Effects of dredging operations on the hydrodynamics of an ebb tidal delta: Oka Estuary, northern Spain. Continental Shelf Research 29, 1983-1994. DOI: 10.1016/j.csr.2009.01.014


    - Garel E, Lopez M, Collins MB, 2008. Sediment resuspension events induced by the wake wash of deep-draft vessels. Geo-Marine Letters, 28 (4), 205-211. DOI: 10.1007/s00367-008-0101-y.


    - Garel E, Lagabrielle Y, Pelletier B, 2003. Abrupt axial variations along the slow to ultra-slow spreading centers of the northern North Fiji Basin (SW Pacific): Evidence for short wave heterogeneities in a back-arc mantle, Mar. Geophys. Res., 24, 245-263. Doi: 10.1007/s11001-004-1060-y

    - Mège D, Cook CC, Garel E, Lagabrielle Y, Cormier MH, 2003. Volcanic rifting at martian grabens, Jour. Geophys. Res., 108, E5, 5044. Doi: 10.1029/2002JE001852.


    - Garel E, Dauteuil O, Lagabrielle Y, 2002. Deformation Processes at fast to ultra-fast oceanic spreading axes: mechanical approach, Tectonophysics, 346, 223-246. Doi:10.1016/S0040-1951(01)00280-3


    - Lagabrielle Y, Garel E, Dauteuil O, Cormier MH, 2001. Extensional faulting and caldera collapse in the axial region of fast spreading ridges: Analog modeling, J. Geophys. Res., 106: 2005-2015. Doi: 10.1029/2000JB900266

    - Pelletier B, Lagabrielle Y, Benoit M, Cabioch G, Calmant S, Garel E, Guivel C, 2001. Newly identified segments of the Pacific-Australia plate boundary along the North Fiji Transform Zone, Earth Planet. Sci. Lett., 193, 347-358. Doi:10.1016/S0012-821X(01)00522-2



    - Garel E, 2017. Efficient dredging strategy for channel maintenance of the Guadiana ebb-delta. Proc. of Coastal Dynamics 2017, Helsingor, Denmark, paper 232, 12 p.

    - Garel E, 2017. Collection and dissemination of data from environmental monitoring systems in estuaries. Proceeding of 4th Experiment@International Conference, Faro, Portugal. IEEE (Eds), 2017, 4p. DOI: 10.1109/EXPAT.2017.7984418

    - Laiz, I., Relvas P , Plomaritis TA, Garel E, 2016. ERASMUS experience between the University of Cadiz (Spain) and the University of Algarve (Portugal). Proceedings of EDULEARN16, Barcelona, July 2016. Doi: 10.21125/edulearn.2016.2119

    - Garel E, Manso F, Collins MB, 2005. Hydrodynamics and sediment transport during a tidal cycle on the Kwinte Bank (Southern North Sea), Proceedings of the 5th Conference of Coastal Dynamics (Barcelona, Spain, ASCE eds.), ON CDROM (ISBN 0-7844-0855-6),135-136.

    - Mège D, Cook T, Garel E, Lagabrielle Y, Cormier MH, 2002. Surface collapse and volcanic rifting on mars, Lunar Planet. Sci. Conf. XXXIII, Texas, Houston, Lunar and Planetary Institute, CD-ROM, 2042.pdf.

    Lagabrielle Y, Bourgois J, Suarez M, De La Cruz R, Garel E, Dauteuil O, Gutscher MA, 1999. From compressional to extensional tectonic regime at the front of the Patagonian Andes, 46°S-47°S: a response to the subduction of the Chile spreading ridge? In proceeding of: Internatinal Symposium of Andean Geology (ISAG), Universitât Gôttingen, Germany, Volume: Extended abstracts, IRD, Paris, p. 411-417

  • Projects:


    - “ECO-SUD”: integrated sea-land neo-tectonic study of the active Chile ridge subduction, (co-funded France-Chili, 1998-1999)

    - Collaboration with the French “Institut National des Sciences de l´Univers” (INSU) on the project "Banque de données Dorsales": compilation of geophysical data upon oceanic ridges, for diffusion to the scientific community, 1999

    - "EUMARSAND": Environmental impacts of marine aggregates dredging: hydro- sediment dynamics impacts of marine sand and gravel dredging (EU-funded Research Training Network, 2003-2006)

    - Collaboration with AZTI-Tecnalia (Spain): Morphological evolution of San Sebastian beach (Funded by San Sebastian Municipality, 2004)

    - Collaboration with AZTI-Tecnalia and the University of Basque Country (Spain): Morphodynamics of the Oka Estuary, Spain (Unesco-funded, 2005)

    - Calibration of hydrodynamic and sediment transport models (funded by National Institute for Space Research, INPE, Brazil, 2006-2007).

    - "NITROLINKS": Loading into the Ria Formosa through Coastal Groundwater Discharge - Pathways, turnover and links between land and sea in the Coastal Zone (FCT-funded, 2006-2009)

    - "DETI": Dynamics of ephemeral tidal inlets (FCT-funded, 2006-2009)

    - "BAYBEACH": Evolution and Management of Embayed Beaches in Contrasting Environments (FCT-funded 2006-2009)

    - "BRISA": Breaking waves interaction with sand transport (FCT-funded 2006-2009)

    - "SPICOSA": Science and Policy Integration for Coastal System Assessment (EU-funded 2007-2010)

    - "MICORE": Morphological impacts and coastal risks induced by extreme storm events (EU-funded, 2008-2011)

    - "MARINA": Marine Renewable Integrated Application Platform; Environmental impacts of marine renewable energy platforms (EU-funded, 2010-2014)

    - "SHORE": Shoreface morphodynamics: an integrated approach (FCT-funded PTDC/MAR-EST/3485/2012)

    - "SCORE" Sustainability of using Ria Formosa Currents On Renewable Energy production (funded by the Portuguese Foundation for Science and Technology FCT - PTDC/AAG-TEC/1710/2014) - started on 1st July 2016

    - “Hydrodynamics of floods in narrow estuaries”, funded by the FCT Investigador programme (IF/00661/2014/CP1234), July 2015- June 2020.