Torm Ulla tekitas Soome lahel rekordkõrged suvelained

Torm Ulla tekitas Soome lahel rekordkõrged suvelained

EN

Storm Ulla created record-high summer waves in the Gulf of Finland

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. Siis mõõdeti lainekõrgus 3,7 meetrit. Seekord põhjustas kõrged lained tugev tuul. . Kõik see juhtus Soome lahe kesk- ja lääneosas.
. . Kui tuul on lahe pikkusesuunas, tekivad kõrgemad lained. Kui tuul puhub teises suunas, peab see olema tugevam.
. Seal mõõdeti tuulekiiruseks 30,0 m/s. Soome lahe idaosas olid lained ilmselt veel kõrgemad. Praegu ei ole seal seadmeid, mis laineid mõõdaksid. Sellepärast oleks vaja rohkem seadmeid lainete mõõtmiseks.
. Oluline on ka lainete pikkus. . Seetõttu peatasid mõned suured laevad oma sõidud. Lained võivad olla ka kaks korda kõrgemad kui prognoositakse. Seda pidavad arvestama kõik meresõitjad.
. Kui prognoos näitab 0,3 meetri lainekõrgust, siis ei tohiks merele minna. Suure tõenäosusega on lained siiski kõrgemad.
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Storm Ulla created very high waves in the Gulf of Finland. The waves were higher than previous summer records. A device from Tallinn University of Technology measured the wave height at 4.1 meters. Such high waves have not been seen here since 1980.
The previous summer record dates back to 2007. At that time, the wave height was measured at 3.7 meters. This time, the high waves were caused by strong winds. The wind speed reached 27.1 meters per second. All of this happened in the central and western parts of the Gulf of Finland.
Very strong winds are needed for waves to form. The wind must blow in a certain direction and for at least six hours continuously. If the wind is in the longitudinal direction of the gulf, higher waves are formed. If the wind blows in another direction, it must be stronger.
The wind was strongest in Vaindloo. There, the wind speed was measured at 30.0 m/s. In the eastern part of the Gulf of Finland, the waves were likely even higher. Currently, there are no devices there to measure the waves. Therefore, more devices are needed to measure the waves.
The height of the waves is not the only important thing. The length of the waves is also important. At night, the waves were about 130 meters long. As a result, some large ships stopped their journeys. Waves can also be twice as high as predicted. All sailors must take this into account.
For small boats, waves as high as 0.5 meters are already dangerous. If the forecast shows a wave height of 0.3 meters, one should not go to sea. Most likely, the waves will still be higher.
Working at night makes navigation at sea more difficult. The driver of a small boat must always keep the boat against the waves and adjust the course.