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Sea level "surges" refer to the generally small variations (of the order of magnitude of one to five meters) in sea level that are added to the higher sea level heights due to tides, tsunamis or seiches.
These are slow variations in sea level from normal, lasting up to several days, which differentiates them from tides, tsunamis and seiches.
These variations are generally due to meteorological effects on the sea surface, i.e. variations in atmospheric pressure, which act directly on the water level, or wind friction, which tilts the sea surface.
Predictive surge calculations are also in the process of being developed, and refined as well-documented events occur.
The surge on February 28, 2010 in the La Rochelle region was only 1.5 m, which is quite...
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