PREVENTIVE MEASURES AGAINST TSUNAMI

BY Rohit Chaurasia 71/08 III B. Tech Tech Civil Civ il Engg .

Tsunami is a series se ries of  waves with extremely long wave length and long period generated when a body of  water rapidly displaced.

The term 'tsunami' comes from the Japanese, meaning "harbor "harbor" " (tsu ) and "wave "wave" " (nami )

CAUSES OF TSUNAMI Earthquake mass movements above or below water some volcanic eruptions Underwater explosions Landslides

Earthquake Earthqu ake Tsunam Tsunamii Formation Formation Earthquake Water column up and down Potential energy Kinetic energy Tsunami

Earthquakes, Earthquakes, volcanic eruptions and other underwater explosions below water all have the potential to generate a tsunami.

Landslide Tsunami

CHARACTERISTICS Speed:

V =¥g h Intensity: I

= 0.5 log 2H

H = average maximum runup height

Tsunami Velocities

CHARACTERISTICS ` ` ` `

Max Run up : Amplitude : Wave Length : Tsunamis are shallowsha llow-water water waves. Its height in deep water is very less but when it penetrates in shallow water, its speed & wave length decreases & height increases.

SIGNS OF AN APPROACHING TSUNAMI Earthquakes are often a cause of tsunami. If the part of tsunami to reach land is trough the water along the shoreline shoreline may recede dramatically, exposing areas that are normally always submerged, It¶s a big sign of tsunami.

WARNING Bottom pressure sensor: hese are anchored and attached to  buoys. Sensors on the equipment constantly monitor the pressure of  the overlying water  column. T

A tsunami cannot be prevented or precisely predicted.

Bottom pressure sensor :

A Tsunami Warning System (TWS) is a system to detect tsunamis and issue warnings to prevent loss of life and property. property. It consists of two equally important important components: a network of sensors to detect tsunamis and a communications infrastructure to issue timely alarms to peoples.

PREVENTION It is not possible to prevent a tsunami. But we can mitigate losses from it by-

aking sea wall

M

aking floodgates and channels to redirect the water from incoming tsunami. Plantation of mangroves and coastal forests along the coast line. M

sea wall of japan

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. Development

centers.

of tsunami detection, forecasting and warning

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Japan was hit by an giant earthquake on March 11,2011, 11,2011, that t hat triggered a deadly 23foot 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.

Tsunami is a natural, unstoppable but predictable phenomenon. We can¶t avoid it but we can mitigate its losses by taking appropriate preventive measures.

Thank Yo You