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Marégrafo de Cascais



Following a protocol established between the Câmara Municipal de Cascais (Municipal Council of Cascais) and the Portuguese Geographic Institute on the 21st of December 2005, aimed at collaborating on the conservation, promotion and animation of this piece of heritage, the Marégrafo de Cascais (Cascais Tide Gauge) can be visited by appointment.
 
The Marégrafo de Cascais (Cascais Tide Gauge) dates back to the last 19th century and was one of the first European observatories dedicated to the study of currents and tides. The system was built in 1877 by A. Borrel, in Paris, and is still in full operation.
 
Connected to the oceanographic laboratory of King Carlos I, the first of Cascais Tide Gauge was installed in 1882 on the east side of the rock fortress over the bay of Cascais, having moved to the current site (displacement of about 30 metres) on the 23rd of August 1900.
 
Its installation was motivated by the need to establish and maintain a national reference of altitudes. Data collected since its installation has permitted the establishment of different altimetric time references, also allowing the continuous adaptation of the "Datum altimeter" (zero altimetry registered for more than a century in Cascais).
 
The values of mean sea level, that the Portuguese Geographic Institute has been collecting on the Cascais tide gauge, are interesting not only to the country but also to the international scientific community, for two main reasons: the amplitude of the time series of values and the geographical situation of Cascais. For these reasons, these values have been provided for more than 120 years to the international PSMSL service (Permanent Service for Mean Sea Level), located in the UK, that uses them globally in various scientific problems, distributing them in a universal database.
 
The longevity and quality of the Cascais tide gauge data allows for the evaluation of the relative vertical movement of the oceanic and continental masses of the coastal zone which, in Cascais, translate into a rise in mean sea level of about 15 cm from the beginning of its operation, with obvious implications in the assessments of its environmental impact in coastal areas.
 
Contacts and Timetable
Address: Av. Maria Pia de Sabóia, Cascais
Guided tours: Tuesdays and Thursdays, by appointment on tel.: 214815328.

 


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