Surge


The tidal wave is the maritime movement induced by the wind that makes contact with it directly, this generates waves with a measure of 1.5 to 2.5 meters high. These movements of water due to the friction of the wind on the surface of the sea have a constant rhythm of approximately 20 seconds, the influence of the wind can spread up to 200 meters towards the bottom of the sea, as the propagation of the force of the wind is in the form This wave loses intensity the further away it is from the main air current.

Many people tend to confuse tsunami with tidal wave, both are different terms since a tsunami as such has an opposite conjugation to the tidal wave, in the development of this maritime phenomenon the sudden movement of the mass of water comes from the depth that being a current so strong that it continues the movement to the surface, generating waves of immense sizes exceeding 5 or 6 meters.

The name of the surge in scientific terms is “cyclonic surge” and as mentioned, it is the push of the wind so that the water reaches higher sea levels; This is not only the product of air movement, this effect is combined with the existence of a low pressure that would be a minor push to generate the surge, it is important to note that this occurs only in shallow waters, which is another difference as opposed to the tsunami.

When there is a conjugation between the swell and the high tide, large and unpredictable waves are obtained, this is due to the fact that the water is managed between the wind and the tide; dangerous swells are not observed frequently, they occur when there are tropical phenomena as well as when not very powerful storms develop. Some examples of major storm surges are: Mahina in 1899 which produced a rise of up to 13 in sea level in Australia, Hurricane Katrina in 2005 which wiped out the population of Saint Louis in Mississippi (United States) and in 1970 Bohla was the tidal wave that claimed numerous lives in Bengal.