钱塘江现鱼鳞潮

重庆 袁 泉

China"s Qiantang River is famous for a unique natural phenomenon,a wavy pattern tide that was only observed for the first time in 2021 and has come to be known as fish scale tide.

The Qiantang River"s estuary (江口)in Zhejiang Province has long been famous for having the strongest tidal bores in the world.At times,they can get as tall as nine meters,which means the area regularly sees trains of large waves moving upstream against the normal current.However,in 2021,during a scientific expedition,researchers discovered another interesting natural phenomenon unique to this estuary.When certain conditions are met,the tide comes in spiraling (螺旋) waves that look like fish scales on the water"s surface.The phenomenon becomes known as fish scale tide.

Because this unusual tide pattern was only observed a couple of years ago,the exact reason for its occurrence is apparently still up for debate.Different sources cite different reasons for the formation of fish scale tide.For example,some netizens believe that the phenomenon is the result of a series of factors.

According toINF News,astronomy,topography and wind direction are the main factors that produce fish scale tide.Apparently,the moon and sun play a big part in the phenomenon,as does the shape of the estuary—very narrow at the river mouth,but then very wide where it meets the sea.Whatever the exact necessary conditions for the formation of fish scale tide may be,one thing is for sure—they rarely occur at the same time,hence the rarity of the phenomenon.

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