Departamento de Hidráulica e Ambiente
Projetos - MADyCOS - Análise multidisciplinar integrada da dinâmica sedimentar e da contaminação fecal em sistemas costeiros de regime intermitente
As zonas terminais das ribeiras costeiras apresentam sistemas estuarinos e lagunares de pequena dimensão mas de elevada complexidade, por estarem sujeitos a rápidas alterações morfológicas das suas embocaduras. Estas alterações conduzem frequentemente à interrupção temporária da comunicação da ribeira com o mar.
O projeto MADyCOS visa melhorar a compreensão da hidrodinâmica, morfodinâmica e contaminação de ribeiras costeiras intermitentes, através de um estudo interdisciplinar que integra três metodologias complementares: aquisição de dados de campo; investigação laboratorial; modelação numérica.
Summary
The downstream areas of coastal streams contain small estuaries and lagoons of complex nature due to the strong morphological changes of their inlets. These morphological changes often lead to the inlet closure, as a result of the action of waves, tides and intermittent river flows. Hydrodynamics, morphodynamics and water renewal are thus highly variable, both at seasonal and shorter time scales, which hampers the monitoring, the forecasting and, ultimately, the management of these systems. This strong dynamics makes the intermittent coastal streams very sensitive to contamination/pollution, as contaminated discharges may have very different consequences depending on the capacity of water renewal of the system at that time.
MADyCOS aims at improving the current understanding of the hydrodynamics, morphodynamics and potential for fecal contamination of intermitent coastal streams, through an interdisciplinary study that integrates distinct but complementing methodologies: field data acquisition, laboratory research and high-resolution numerical modeling.
The integrated use of these approaches in the relevant disciplines (long-wave hydrodynamics, short-wave propagation, morphodynamics and fecal contamination) will allow the evaluation of the relative impact of each forcing on the morphology of the system and its effect on the water quality. The small dimensions of the intermitent Aljezur coastal stream system make it an ideal testbed for the proposed methodology. This system, located in an environmentally protected area, presents a very dynamic inlet which closes occasionally. Simultaneously, the Aljezur coastal system has significant importance both at ecological and local economy (tourism, aquaculture) levels, both inside the stream and in the coastal area.
Maintaining the high standards of water quality, for both ecological and recreational purposes, has been a growing concern for the management authorities. Indeed, any increase in antrophogenic pressure may lead to the aggravation of the pollution loads, with potential damaging consequences for the ecosystem and the quality of bathing waters at the two official beaches.
Evaluating the impact of this antrophogenic pressure requires the detailed knowledge of the inlet’s morphological evolution, dependent on the relative strenght of each forcing, and of the evolution of the fecal contamination plumes for specific environmental conditions. Field surveys provide a first cut at understanding the dependence of the hydrodynamics, morphology and fecal contamination in the coastal stream of the relative strengths of river flow, tidal magnitude, short waves regime and of the pollutant discharges caracteristics.
These surveys will also provide additional data to validate the numerical models.
These models will be used first in diagnostic mode to define the sampling sites. Historical data and the data collected in the scope of the project will be integrated in a multidisciplinary database.
Microbiological laboratory experiments will increase the current knowledge on the dominant processes controlling the survival of microorganisms in fecal contamination plumes in coastal streams. Solar radiation, temperature, salinity and organic load are among the issues to be investigated both with field samples and in controlled laboratory conditions. The outcome of these studies will be used in the set-up of the new fecal contamination model to be developed in MADyCOS, which will be used to simulate the evolution of fecal contamination plumes in the Ribeira de Aljezur.
Multiple topographic and bathymetric surveys and grain size distribution of the sediments in the downstream area, taken for several hydrodynamic conditions, will be used to characterize the inlet's morphodynamics.
Relationships between forcings and inlet morphology will be sought through the combination of the above data and the hydrodynamic and the wave numerical simulations.
These relationships will then be validated with a morphodynamic modeling system.
The range of inlet configurations will be defined next, based on the above morphological analysis. A set of scenarios will be set-up to represent different exchange capacities between the stream and the sea.
The impact of this variability on the hydrodynamics, residence times and potential for fecal contamination of the system's beaches will be evaluated using the suite of mathematical models developed and applied in the project. MADyCOS will provide valuable and inexistent knowledge on the hydrodynamics, morphodynamics, residence times and sanitary condition in the Aljezur coastal stream, which will be vital for its adequate management, as recognised by the local wastewater management company (Águas do Algarve S.A.).
The project will also advance the state-of-the-art on the physical and microbiological processes and their interdependence and propose a new, multidisciplinary, integrated methodology for the analysis of the dynamics of coastal systems.
Selected Results
Publications
Articles in international magazines
O projeto MADyCOS visa melhorar a compreensão da hidrodinâmica, morfodinâmica e contaminação de ribeiras costeiras intermitentes, através de um estudo interdisciplinar que integra três metodologias complementares: aquisição de dados de campo; investigação laboratorial; modelação numérica.
The downstream areas of coastal streams contain small estuaries and lagoons of complex nature due to the strong morphological changes of their inlets. These morphological changes often lead to the inlet closure, as a result of the action of waves, tides and intermittent river flows. Hydrodynamics, morphodynamics and water renewal are thus highly variable, both at seasonal and shorter time scales, which hampers the monitoring, the forecasting and, ultimately, the management of these systems. This strong dynamics makes the intermittent coastal streams very sensitive to contamination/pollution, as contaminated discharges may have very different consequences depending on the capacity of water renewal of the system at that time.
MADyCOS aims at improving the current understanding of the hydrodynamics, morphodynamics and potential for fecal contamination of intermitent coastal streams, through an interdisciplinary study that integrates distinct but complementing methodologies: field data acquisition, laboratory research and high-resolution numerical modeling.
The integrated use of these approaches in the relevant disciplines (long-wave hydrodynamics, short-wave propagation, morphodynamics and fecal contamination) will allow the evaluation of the relative impact of each forcing on the morphology of the system and its effect on the water quality. The small dimensions of the intermitent Aljezur coastal stream system make it an ideal testbed for the proposed methodology. This system, located in an environmentally protected area, presents a very dynamic inlet which closes occasionally. Simultaneously, the Aljezur coastal system has significant importance both at ecological and local economy (tourism, aquaculture) levels, both inside the stream and in the coastal area.
Maintaining the high standards of water quality, for both ecological and recreational purposes, has been a growing concern for the management authorities. Indeed, any increase in antrophogenic pressure may lead to the aggravation of the pollution loads, with potential damaging consequences for the ecosystem and the quality of bathing waters at the two official beaches.
Evaluating the impact of this antrophogenic pressure requires the detailed knowledge of the inlet’s morphological evolution, dependent on the relative strenght of each forcing, and of the evolution of the fecal contamination plumes for specific environmental conditions. Field surveys provide a first cut at understanding the dependence of the hydrodynamics, morphology and fecal contamination in the coastal stream of the relative strengths of river flow, tidal magnitude, short waves regime and of the pollutant discharges caracteristics.
These surveys will also provide additional data to validate the numerical models.
These models will be used first in diagnostic mode to define the sampling sites. Historical data and the data collected in the scope of the project will be integrated in a multidisciplinary database.
Microbiological laboratory experiments will increase the current knowledge on the dominant processes controlling the survival of microorganisms in fecal contamination plumes in coastal streams. Solar radiation, temperature, salinity and organic load are among the issues to be investigated both with field samples and in controlled laboratory conditions. The outcome of these studies will be used in the set-up of the new fecal contamination model to be developed in MADyCOS, which will be used to simulate the evolution of fecal contamination plumes in the Ribeira de Aljezur.
Multiple topographic and bathymetric surveys and grain size distribution of the sediments in the downstream area, taken for several hydrodynamic conditions, will be used to characterize the inlet's morphodynamics.
Relationships between forcings and inlet morphology will be sought through the combination of the above data and the hydrodynamic and the wave numerical simulations.
These relationships will then be validated with a morphodynamic modeling system.
The range of inlet configurations will be defined next, based on the above morphological analysis. A set of scenarios will be set-up to represent different exchange capacities between the stream and the sea.
The impact of this variability on the hydrodynamics, residence times and potential for fecal contamination of the system's beaches will be evaluated using the suite of mathematical models developed and applied in the project. MADyCOS will provide valuable and inexistent knowledge on the hydrodynamics, morphodynamics, residence times and sanitary condition in the Aljezur coastal stream, which will be vital for its adequate management, as recognised by the local wastewater management company (Águas do Algarve S.A.).
The project will also advance the state-of-the-art on the physical and microbiological processes and their interdependence and propose a new, multidisciplinary, integrated methodology for the analysis of the dynamics of coastal systems.
Selected Results
Hydrographic surveys of the Ribeira de Aljezur: A. Maio 2008, B. Setembro 2008, C. Maio 2009 and D. Setembro 2009
Variation of the content of enterococos throughout the ribeira in a tide cycle
Variation of the fecal enterococos throughout the Ribeira during a cycle of tide in May 2008 (alive tide, end of maritime Winter) and in September 2008 (tide deceased, end of maritime Summer)
Validation of the morphodynamic model
Publications
Articles in international magazines
- Poirier, C., P.G. Sauriau, E. Chaumillon, X. Bertin (2010). Influence of hydro-sedimentary factors on mollusc death assemblages in a temperate mixed tide-and-wave dominated coastal environment: Implications for the fossil record, Continental Shelf Research, 30:1876-1890.
- Rodrigues, M., Oliveira, A., Guerreiro, M., Fortunato, A.B., Menaia, J., David, L.M., Cravo, A. (2011). Modeling fecal contamination in the Aljezur coastal stream (Portugal). Ocean Dynamics, DOI 10.1007/s10236-011-0392-9, 16 pp.
- Oliveira, A., Rodrigues, M., Fortunato, A.B., Guerreiro, M., 2011. Impact of seasonal bathymetric changes and inlet morphology on the 3D water renewal and residence times of a small coastal stream. Journal of Coastal Research, SI 64 (Proceedings of the 11th International Coastal Symposium), 5 pp. Szczecin, Poland, ISSN0749-0208.
- Freire, P., Taborda, R., Bertin, X., Guerreiro, M., Fortunato, A. B., Silva, A. M., Andrade, C., Oliveira, A., Antunes, C., Freitas, M. C., Nahon, A., Rodrigues, M., Bruneau, N., 2011. Medium-term morphodynamic evolution of a small coastal inlet. Journal of Coastal Research, SI 64 (Proceedings of the 11th International Coastal Symposium), Szczecin, Poland
- Gama, C., C.J.E.M. Fortes, P. Baptista, L. Albardeiro, L. Pinheiro, R. Salgado, 2011. Medium-term evolution of an intermediate beach with an intertidal bar (Amoreira beach, Southwest Portuguese rocky coast). Journal of Coastal Research, SI 64 (Proceedings of the 11th International Coastal Symposium), Szczecin, Poland
- Capitão, R., Fortes, C.J., Bertin, X., Guerreiro, M., 2010. The use of numerical models as complement of wave measurements in Amoreira Beach, Aljezur. International Conference on Coastal Conservation and Management in the Atlantic and Mediterranean (ICCCM2010), 22 pp. (Journal of Coastal Conservation. ISSN: 1400-0350
- Capitão, R., Fortes, C. J., 2008. Wave regime comparisons on the Portuguese coast. Poster Proceedings of the 31st International Conference on Coastal Engineering, ASCE, Vol. 1, p. 268-279.
- Rodrigues, M., Oliveira, A., Queiroga, H., Guerreiro, M., Fortunato, A.B., Cravo, A., Freitas, M.C., Menaia, J., Dodkins, I., 2009. Dynamic modeling of dissolved oxygen in the Aljezur coastal stream (Portugal), Resumo publicado nas actas da Conferência ISEM2009.
- Cravo A., Menaia J., Napier V., 2010. A qualidade da água da ribeira de Aljezur, SW Portugal: seus efeitos nas águas balneares. 14º ENaSB /SILUBESA Encontro Nacional de Saneamento Básico / Simpósio Luso-Brasileiro de Engenharia Sanitária e Ambiental. Porto, Outubro 26-29 Out.
- Oliveira, A., Fortunato, A.B., Guerreiro, M., Bertin, X., Bruneau, N., Rodrigues, M., Taborda, R., Andrade, C., Silva, A.M., Antunes, C., Freire, P., Pedro, L.S., Dodet, G., Loureiro, C., Mendes, A., 2010. Effect of inlet morphology and wave action on transport and sediment dynamics in a coastal stream, 11th Estuarine and Coastal Modeling, ASCE, Spaulding et al (eds), 601-620.
- Guerreiro, M., Fortunato, A.B., Oliveira, A., Bertin, X., Bruneau, N., Rodrigues, M., 2010. Simulation of morphodynamic processes in small coastal systems: application to the Aljezur coastal stream (Portugal). Actas da EGU General Assembly 2010, 2 pp.
- Menaia, J., Cravo, A., Napier, V., 2010. Evolution of enterobacterial populations along the Aljezur costal stream as correlated to the occurring physical-chemical characteristics of the water. Elsevier, IWA, FEMS: The Water Research Conference. 1pp.
- Jacob, J., Carvalho, R., David, L., Charneca, N., 2010. Building a hydrologic model in HEC HMS supported by GIS tools to provide hydrographs upstream hydraulic structures – the case of Aljezur basin. 3rd International Junior Researcher and Engineer Workshop on hydaulic Structures (IJREWHS’10), Edinburgh, 4th to 6th May.
- Jacob, J., Carvalho, R., David, L., Charneca, N., 2010. Hydraulic structures data provided by GIS tools and hydrologic modelling – the case of Aljezur basin. IJREWHS’10, R. JANSSEN and H. CHANSON (Eds), Report CH79/10, School of Civil Eng., The University of Queensland, Brisbane, Australia, 8 p. ISBN 9781742720159
- Rodrigues, M., Oliveira, A., Guerreiro, M., Fortunato, A.B., Queiroga, H., 2010. Water and ecological quality in the Aljezur coastal stream (Portugal). Book of Abstracts, JONSMOD 2010 Conference, Deltares, Delft, Holanda, 10 a 12 de Maio de 2010.
- Freitas, M.C., Andrade, C., Alday, M., Cearreta, A., Gama, C., Cruces, A., Lopes, V. (2010). Holocene paleoenvironmental evolution of the Aljezur alluvial plain (SW Portuguese coast). XVIII. INQUA Congress, Quaternary sciences - the view from the mountains. Bern, 20-27 July 2011, 1 p.
- Fortunato, A.B., Oliveira, A., Bertin, X., Bruneau, N., Nahon, A., Guerreiro, M., Costa, M., Pinto, L., 2010. Simulação numérica da morfodinâmica de embocaduras, 1as Jornadas de Engenharia Hidrográfica, Instituto Hidrográfico, 4 pp.
- Jacob, J., Charneca, N., Carvalho, R., David, L., 2010. Construção de um modelo hidrológico da bacia de aljezur apoiada em ferramentas SIG. 10º Congresso da Água, 21 a 24 de Março, Alvor, Portugal. Actas do 10º Congresso da Água, Alvor, Portugal, em CD, 16 p.
- Capitão, R., Fortes, C.J., Bertin, X., Guerreiro, M., Simões, A., 2010. Metodologias de aquisição e análise da agitação marítima na praia da Amoreira. 10º Congresso da Água – Marcas d’Água, APRH (Eds), ISBN 978-972-99991-9-2, CD-ROM, 15 pp, 21-24 de Março, Alvor.
- Guerreiro, M., Fortunato, A., Oliveira, A., Bruneau, N., Rodrigues, M., Bertin, X., Dias, J.M., 2011. Mophodynamic modeling of a small and shallow coastal system: the Aljezur coastal stream case. MEC2011 - Conferência sobre Morfodinâmica Estuarina e Costeira, 3pp, 3-4 Fevereiro, LNEC, Lisboa.
- Freire, P., Taborda, T., Guerreiro, M., Bertin, X., Nahon, A., Silva, A. M., Freitas, M. C., Oliveira, A., Andrade, C., 2011. Sediment Variability in a Small Coastal Stream and Adjacent Beach. MEC2011 - Conferência sobre Morfodinâmica Estuarina e Costeira, 3pp, 3-4 Fevereiro, LNEC, Lisboa.
- Oliveira, A., Rodrigues, M., Fortunato, A.B., Guerreiro, M., Bruneau, N., 2011. Processes controlling the water renewal and residence times in a morphologically dynamic coastal stream in the SW coast of Portugal. MEC2011 - Conferência sobre Morfodinâmica Estuarina e Costeira, 3pp, 3-4 Fevereiro, LNEC, Lisboa.
- Capitão, R., Fortes, C.J., (2011). Análise comparativa entre estimativas do modelo numérico SWAN e medições de agitação marítima efectuadas na praia da Amoreira. MEC2011 - Conferência sobre Morfodinâmica Estuarina e Costeira, 3pp, 3-4 Fevereiro, LNEC, Lisboa.
- Oliveira, A. (coord), 2008. Madycos – Multidisciplinary integrated analysis of the sediment dynamic sand fecal contamination in intermittent coastal systems - Relatório 1: Relatório técnico da campanha Madycos 00. Rel. LNEC-NEC/NTI/NPE/NES-FCUL/UALG, 49 pp.
- Fortes, C.J., Capitão, R., 2009. Programas de cálculo automático para análise temporal de dados. Relatório 01/2009. LNEC, 15 pp
- Oliveira, A. (coord), 2010. Madycos – Multidisciplinary integrated analysis of the sediment dynamic sand fecal contamination in intermittent coastal systems - Relatório 2: Relatório técnico da campanha Madycos 01 10/09/2008 a 12/09/2008. Rel. 15/2010 – LNEC– NEC/NTI/NPE/NES-FCUL/UALG, 37 pp.
- Oliveira, A. (coord), 2010. Madycos – Multidisciplinary integrated analysis of the sediment dynamic sand fecal contamination in intermittent coastal systems - Relatório 3: Relatório técnico da campanha Madycos 02 11/05/2009 a 13/05/2009. Rel. 123/2010 – LNEC – NEC/NTI/NPE/NES-FCUL/UALG, 76 pp.
- Freire, P. (coord), 2010. Madycos – Multidisciplinary integrated analysis of the sediment dynamic sand fecal contamination in intermittent coastal systems - Relatório 4: Relatório técnico da campanha Madycos 03 7/09/2009 a 9/09/2009. Rel. 328/2010 – LNEC-NEC/NTI/NPE/NES-FCUL/UALG, 35 pp.
- Freire, P. (coord), 2011. Madycos – Multidisciplinary integrated analysis of the sediment dynamic sand fecal contamination in intermittent coastal systems - Relatório 5: Relatório técnico da campanha Madycos 04 8/09/2010 a 10/09/2010. Rel. 11/2011 – LNEC-NEC/NTI/NPE/NES-FCUL/UALG, 35 pp.
Ano: 2008-2011
Coordenador(es):
Laboratório Nacional de Engenharia Civil
Entidade(s) Financiadora(s):
Fundação para a Ciência e a Tecnologia (FCT)
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