Monitoring the tide gauges of the Marseille observatory
The Marseille observatory was installed in 1885 at no. 174 of the Corniche (coast road). It is referenced as a GLOSS station and offers the longest series of observations of sea levels on the French Mediterranean coast.
The mechanical tide gauge, which has functioned since the observatory was established, has the special feature of being a totalisator; that is it is able to calculate the average sea level over a given period of time. The latest of these instruments are two digital tide gauges incorporated into the RONIM network and compatible with national and international standards: an acoustic tide gauge that was installed in July 1998 was replaced in April 2009 by a more reliable instrument that contained a telemetry radar.
The Geodesy and Levelling department of the IGN (French national geography institute) in collaboration with the University of La Rochelle has recently published a technical instruction for monitoring these tide gauges. This document describes how to take measurements and the processing and analysis of the observations.
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