Everything about Tide Gauge totally explained
A
tide gauge is a device for measuring sea level and detecting tsunamis.
Sensors continuously record the height of the water level with respect to a height reference surface close to the
geoid. Water enters the device by the bottom pipe (far end of the tube, see picture), and electronic sensors measure its height and record it to a tiny computer.
Data are available for over 1,750 stations worldwide. At some places records cover centuries, for example in
Amsterdam where data dating back to 1700 is available. When it comes to estimating the greater ocean picture, new modern tide gauges can often be improved upon by using satellite data.
Tide gauges are used to measure
tides and quantify the size of
tsunamis.
The measurements make it possible to derive the
mean sea level. Using this method, sea level slopes up to several 0.1 m/1000 km and more have been detected.
A tsunami can be detected when the sea level begins to rise, although warnings from seismic activity can be more useful.
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