Araujo, I., Pugh, D. and Dias, J.
Sea level variability and its impacts in a NW European lagoon: Ria de Aveiro, Portugal
In PECS 2004 Proceedings - extended abstracts.
PECS (Physics of Estuaries and Coastal Seas)., .
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Sea level variation is a main contributor in controlling the evolution of coastal lagoons as well as determining risks of coastal flooding. This work investigates both long and short-term sea level variability in the Ria de Aveiro, a tide-dominated shallow coastal lagoon located on the western coast of Portugal. The 27 year series of available sea level observations from the permanent tide gauge, at the mouth of the Lagoon, has been analyzed for changes in the different sea level components: tides, surges and mean sea level. The various tidal constituents show interesting local short-term variations in amplitude and phase but no long-term trends. There is no evidence of an increase in weather effects on sea levels and of mean sea level over the period analyzed. Short (1-3 month) sea level data collected during two surveys (1987/8 and 2002/3) in the lagoon are compared. Results show that there has been a significant change in the tidal characteristics of the Lagoon with a general increase in amplitude and decrease in phase for most harmonic constituents.
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