8 September 2014

Protection from Cyclones : Science CBSE Notes

Protection from Cyclones:

Cyclones cause a lot of damage to land, people and property, and create a lot of havoc in the lives of the people. When a cyclone hits an agricultural field, it makes the land infertile and useless for agriculture. A cyclone spares nothing. It worsens the flood situation. There are indirect impacts of a cyclone as well, such as flooding in coastal areas. Flooding not only damages land, but also pollutes drinking water sources. This can cause epidemics.

High waves several kilometres away from the shore indicate an upcoming storm. As a cyclone strikes the coast, the intense winds raise the water into a gigantic wave that is pushed towards the shore. High-speed winds during a cyclone can cause major damage to houses, human beings, animals, trees, power supply, and even communication systems such as telephones.

Cyclones, Protection from Cyclones, NCERT Notes, CTET Exam Notes

Storm Surge

A high wall of water moving towards the shore from the ocean is called a storm surge.

Storm Tide

The combination of a storm surge and a tide is known as a "storm tide". The most dangerous storms are the ones where the storm surge arrives on the top of a high tide, and then the storm reaches an area that might otherwise have been safe.

Meteorological Department

The department that carries out a scientific study of the atmosphere and focuses on weather forecasting and processes. 
Tropical cyclones are given names. The names are selected from a list decided by the national meteorological organisation of a country, or by a committee of the World Meteorological Organisation. The names of tropical cyclones that cause major death or destruction are not used again, as a tribute to the people who lose their lives in the disaster.

Cyclone Alert

A warning issued 48 hours before the expected time of a cyclone.

Cyclone Warning

A warning issued 24 hours before the expected time of a cyclone.

A cyclone causes destruction through:

  • High-rise waves
  • High-speed winds that uproot trees, houses and other property
  • Contamination of drinking water
  • Heavy rainfall that worsens the flood situation
  • Flooding of agricultural land by sea water making it infertile

Safety measures taken by the government: 

To keep people safe and secure during a cyclone, the government takes certain measures, such as:
  • Constructing cyclone warning centres
  • Making arrangements to relocate people during cyclones
  • Providing information about a cyclone, and warning people, fishermen, ships, ports, airlines and various government agencies
  • Delivering accurate and effective cyclone forecasts and warnings

Safety measures to follow before and during a cyclone:

  • Do not move out unless and until required.
  • Keep a note of all the warnings given by the Meteorological Department.
  • Keep emergency phone numbers of police, ambulance and fire brigade handy.
  • Move people and valuable items to a safe place.
  • Store hygienic drinking water.
  • Help neighbours.
  • Avoid contact with wet electric lines and switches.