Volume 15, Issue 4 - December 2015


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Revista de Gestão Costeira Integrada
Volume 15, Número 4, Dezembro 2015, Páginas 533-544

DOI: 10.5894/rgci577
* Submission: 8 JAN 2015; Peer review: 1 MAR 2015; Revised: 20 MAY 2015; Accepted: 26 JUN 2015; Available on-line: 29 JUN 2015  

Supporting Information (555KB, PDF)

Modelling the thermal effluent of a near coast power plant (Sines, Portugal) *  

D. V. Salgueiroa; H. de Pabloa; R. Nevesa; M. Mateusa

@ - Corresponding author to whom correspondence should be addressed.
a - MARETEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.     

The present work is focused on the dispersion of a thermal effluent, produced by the Sines power plant, Portugal, along coastal waters. This facility intakes a yearly average around 40 m3/s of seawater, for the required cooling process, which is subsequently discharged back to the ocean at a 10 ºC increase in temperature. A three-dimensional hydrodynamic local model was nested into a regional model and set up to simulate the transport of the thermal effluent during two distinct periods, August and October 2013, respectively featuring dominant north and south wind. The simulations were performed for both situations, with and without the thermal discharge, where the later provides baseline scenarios. Obtained model results closely followed the existing field data. The temperature increase is shown to decay from 10 ºC near the outlet vicinity to 2 ºC at a distance of 2 km from the outlet for both scenarios. Even though the main driving force of this phenomenon is the wind, tidal conditions also have additional influence on thermal plume dispersion near the discharge area. In the north wind scenario the plume extends away from the coast while under south wind dominance the plume is contained near the coast, extending towards the inlet. As a consequence there is a positive feedback under south wind dominance, which is caused by the intake of already warm water from the thermal plume itself. Consequently, south wind dominance is the most unfavorable scenario for both coastal environment and the operational efficiency of the power plant.

Keywords: Thermal discharge; Three-dimensional model; Coastal hydrodynamics; Water temperature   

Modelação de um efluente térmico numa zona costeira (central termoelétrica de Sines, Portugal)

Modelação de um efluente térmico numa zona costeira (central termoelétrica de Sines, Portugal) Este artigo tem como objetivo estudar a dispersão do efluente térmico da central termoelétrica de Sines (Portugal) na zona costeira. Esta central retira em média 40 m3/s de água do oceano Atlântico que após o processo de refrigeração é restituída à fonte através de dois canais, com uma temperatura de 10º C acima daquela que tinha na zona de captação. De modo a estudar o transporte deste efluente térmico foi implementado um modelo hidrodinâmico tridimensional acoplado a um modelo regional. Foram simulados e analisados dois cenários de ventos diferentes, vento predominante do quadrante norte e vento predominante do quadrante sul. Para cada tipo de vento são comparados os resultados para a situação com e sem descarga. Os resultados obtidos com o modelo evidenciam a anomalia térmica, observável nos dados de campo, mostrando um aumento variável entre 10º C, na região próxima à descarga, até 2º C a cerca de 2 km da mesma área, para ambos cenários. Contudo, enquanto que no cenário de vento norte se observa uma pluma térmica estreita, ao longo da costa, no caso do vento sul observa-se uma pluma mais confinada à região da saída do efluente. O vento sul é o cenário mais desfavorável à eficiência da central uma vez que nesta situação a pluma é direcionada para zona de captação. Assim conclui-se que o vento tem um papel preponderante na dispersão do efluente térmico. Os resultados do modelo mostram ainda que a maré também influência a dispersão, sobretudo na zona junto à descarga. 

Palavras-chave: Efluente térmico; Modelo tridimensional; Hidrodinâmica Costeira; Temperatura da água


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