preventive measures against tsunami
TRANSCRIPT
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BY Rohit Chaurasia71/08III B. Tech Civil Engg.
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Tsunami is a series of waves with extremely long wave length and long period generated when a body of water rapidly displaced.
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The term 'tsunami' comes from the Japanese, meaning "harbor" (tsu ) and "wave" (nami )
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• Earthquake• mass movements above or below water• some volcanic eruptions• Underwater explosions• Landslides
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Earthquake
Water column up and down
Potential energy
Kinetic energy
Tsunami
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Earthquakes, volcanic eruptions and other underwater explosions below water all have the potential to generate a tsunami.
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• Speed:
V =√g h
• Intensity:
I = 0.5 log 2H
H = average maximum run-up height
Tsunami Velocities
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Max Run up : Amplitude : Wave Length : Tsunamis are shallow-water
waves. Its height in deep water is very less but when it penetrates in shallow water, its speed & wave length decreases & height increases.
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• Earthquakes are often a cause of tsunami.
• If the part of tsunami to reach land is trough the water along the shoreline may recede dramatically, exposing areas that are normally always submerged,It’s a big sign of tsunami.
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• A tsunami cannot be prevented or precisely predicted.
• Bottom pressure sensor:
These are anchored and attached to buoys. Sensors on the equipment constantly monitor the pressure of the overlying water column.
Bottom pressure sensor:
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A Tsunami Warning System (TWS) is a system to detect tsunamis and issue warnings to prevent loss of life and property. It consists of two equally important components: a network of sensors to detect tsunamis and a communications infrastructure to issue timely alarms to peoples.
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• It is not possible to prevent a tsunami. But we can mitigate losses from it by-• Making sea wall
sea wall of japan
• Making floodgates and channels to redirect the water from incoming tsunami.
• Plantation of mangroves and coastal forests along the coast line.
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.• Development of tsunami detection, forecasting and warning centers.
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Japan was hit by an giant earthquake on March 11,2011, that triggered a deadly 23-foot tsunami in the country's north.
Its magnitude was 8.9. More than 20,600 were
confirmed dead and more than 13,000 peoples still missing.
Three nuclear reactors destroyed.
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Tsunami is a natural, unstoppable but predictable phenomenon. We can’t avoid it but we can mitigate its losses by taking appropriate preventive measures.
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Thank You