Abstract
Tide gauges are measuring the sea level relative to a datum in the best cases since the mid to late 1800s. Because the land is subject to isostasy or subsidy, this measure does not give the absolute but only the relative sea level fluctuations. It is shown that these relative fluctuations have many periodicities up to detected quasi-60 years, but longer periodicities may also exist, even if the records length does not permit to fully clarify. A simple but reliable procedure is presented to compute the relative sea level velocity and the relative sea level acceleration as it is needed for coastal planning.
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