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2020/09/05 10:35 Weather news
Typhoon No. 10 can approach while maintaining the strongest class power in the past, and if the suction effect due to pressure drop and the blowing effect due to the storm overlap, it is not strange that the level of the tide reaches a record. .. Be aware of the high tide mechanism and precautions when evacuating.
High tide is a phenomenon called “suction” in which the sea level rises when a typhoon approaches and the pressure drops. At the same time, a phenomenon called “blowing” occurs in which sea water rushes towards the coast due to strong winds. The closer the high tide approaches, the higher the tide level. When “suck”, “blow” and “high tide” are aligned, the sea level on the shore rises 3 to 4 m, and the sea water flows over the embankment and the tidal embankment.
Flood damage caused by high tides, not only in the lowlands near the coast, but also in the inner part of the bay where there is no escape for seawater and the water level tends to rise, and in the river mouth where high tide and flood hazards may overlap, the tide level tends to rise even higher. It is considered a particularly dangerous area of.
・ In September 1927, a typhoon (central pressure at landing of 980 hPa) landed and the tide level of the Ariake Sea rose to 3.8 m. 439 people died or disappeared and 1,420 houses were totally or partially destroyed.
・ In September 1945, Typhoon Pillowzaki landed in the southern part of Kyushu (central pressure at the time of landing of 916 hPa), and the tide level rose to 2.6 m. There were 3,122 dead and missing and 113,438 totally or partially destroyed.
・ In August 1985, Typhoon No. 13 (central pressure at landing of 955 hPa) landed, and the tide level of the Ariake Sea increased by a maximum of 3.3 m. Three people died or disappeared and 589 houses were totally or partially destroyed.
・ In September 1999, Typhoon No. 18 (central pressure at landing 940 hPa) landed, and the Yashiro Sea tide level rose to 4.5 m, causing 13 deaths / missing and 845 houses total or partially destroyed. ..
Also, the closer to the center of the typhoon, the greater the impact of high tide, so be sure to check the last expected heading. Also, the tide level can rise abnormally in a short period of time, not to mention high tide time, for several hours before and after high tide time. Check the time of high tide in advance along with the latest weather information.
If there is a possibility of your home being flooded due to high tide, prepare an emergency bag and evacuate as soon as possible in the event that an evacuation notice, evacuation order, or evacuation preparation information is issued. If you have family members or acquaintances who live in a safe place, consider evacuating there.
To protect yourself from high tides, it is essential to evacuate as soon as possible. However, if it is difficult to evacuate outside due to a storm, don’t overdo it and try to escape to the highest place possible and wait. If high tide is already approaching when you notice it, stay calm and try to do everything you can to save your life.
Cabinet, Fire Department, Ministry of Agriculture, Forestry and Fisheries, Fisheries Agency, Ministry of Lands, Infrastructure, Transport and Tourism, Meteorological Agency “High tide disaster and its response”, Ministry of Land, Infrastructure, Transport and Tourism Office Regional Development Department of Shikoku “What is the difference between tsunami and high tide?” http://www.skr.mlit.go.jp/bosai/bosai/tounannkai/kisochishiki/tunamikankei/douchigauno/douchigauno.html)
