natural calamities

Free Powerpoint Templates


Natural Calamities

Presentation By – Ridhi Piplani


Natural Calamities (Disasters)

Natural Calamities (Disasters) are disasters that occur in this world naturally.

Natural disasters can happen at any location at any time throughout the universe.

Natural disasters can destroy cities, or sometimes a whole country if it is that severe.

They can occur on land, in the water, and with the weather.


Natural Disasters

EARTHQUAKE

VOLCANIC ERUPTION

LANDSLIDES

HURRICANE

TSUNAMI

WILD FIRE

TORNEDO

FLOOD

HEAT WAVE

DROUGHT


The Nature of the Hazard a. Rapid Onset vs. Slow OnsetAt one extreme earthquakes, landslides, and flash floods give virtually no warning. Less extreme are tsunamis, which typically have warning periods of minutes or hours, and hurricanes and floods, where the likelihood of occurrence is known for several hours or days in advance. Volcanoes can erupt suddenly and surprisingly where as hazards such as drought, desertification, and subsidence act slowly over a period of months or years. b. Controllable Events vs. Immutable EventsFor some types of hazards the actual dimensions of the occurrence may be altered if appropriate measures are taken(Eg floods). For others, no known technology can effectively alter the occurrence itself(Eg earthquakes,volcanoes,etc.). c. Frequency vs. SeveritySome hazards like floods occurs every year or every few years, the hazard becomes part of the landscape, and projects are sited and designed with this constraint in mind. Unlike tsunami which may strike any time in 50 or 100 years, it is difficult to take up mitigation measure.. d. Mitigation Measures to Withstand Impact vs. Mitigation Measures to Avoid ImpactEarthquake-resistant construction and flood proofing of buildings are examples of measures that can increase the capacity of facilities to withstand the impact of a natural hazard. Measures such as zoning ordinances, insurance, and tax incentives, which direct uses away from hazard-prone areas, lead to impact avoidance


Fundamental Concepts Related To Natural Hazards

Natural process have service functions.

Hazards are predictable.

Linkages exist between hazards and physical and biological environment.

Hazards that previously produced disasters are now producing catastrophes

Risks from hazards can be estimated.

Adverse effects can be minimized.


Land movement disasters Land movement disasters are disasters that occur on land. Some land movement disasters are earthquakes, avalanches, volcanic eruptions, wildfires, landslides and many more.

Water Disasters Water Disasters are disasters that occur in water such as oceans, rivers, lakes, etc.Some types of water disasters are droughts, tsunamis, tidal waves, floods, and many more. Weather Disasters Weather disasters are disasters that occur with the weather and causes changes in the weather. Some types of weather disasters are tornadoes, cyclones, hurricanes, blizzards, lighting, thunderstorms.


Earthquakes

• The shaking or trembling caused by the sudden release of energy

• Usually associated with faulting or breaking of rocks

• Continuing adjustment of position results in aftershocks


Global Earthquake Global Earthquake LocationsLocations


Volcanic Eruptions

A volcano is an opening in A volcano is an opening in the planets surface which the planets surface which lets hot, rocks, ash, lets hot, rocks, ash, molten lava, and gases molten lava, and gases onto the surface from onto the surface from inside the planet. inside the planet.

Volcanic activity involving Volcanic activity involving the extrusion of rock the extrusion of rock intends to form mountains intends to form mountains over a period of time.over a period of time.

Volcanoes are found where Volcanoes are found where tectonic plates are either tectonic plates are either diverging or convergingdiverging or converging. .

• A volcanic eruption is when a A volcanic eruption is when a volcano erupts and lets out volcano erupts and lets out lava, rocks, ash, and many lava, rocks, ash, and many more things. more things.

• These things that are let out These things that are let out during a volcanic eruption are during a volcanic eruption are from the inside of the planet. from the inside of the planet.

• Volcanoes can form where Volcanoes can form where there is stretching and thinning there is stretching and thinning of the planet’s crust or surface.of the planet’s crust or surface.


Wildfires• Wildfires are common in Wildfires are common in different parts of the different parts of the world and they happen in world and they happen in cycles. cycles.

• They are useful in the They are useful in the wilderness sometimes wilderness sometimes because the effects of because the effects of the fires help some the fires help some species with growth and species with growth and reproduction. reproduction.

• Nine out of ten wildfires Nine out of ten wildfires are caused by humans are caused by humans interaction.interaction.

Wildfires are when fire is Wildfires are when fire is spreading quickly. A wildfire spreading quickly. A wildfire is a fierce fire that spreads is a fierce fire that spreads rapidly and mostly in an area rapidly and mostly in an area of wilderness of wilderness

A wildfire is any uncontrolled A wildfire is any uncontrolled fire which occurs in fire which occurs in wilderness, wild lands, or wilderness, wild lands, or bushes. bushes.

Another word to say wildfire can Another word to say wildfire can be bushfire, hill fire, and be bushfire, hill fire, and many more things can be the many more things can be the same meaning as a wildfire. same meaning as a wildfire.

Wildfires means something Wildfires means something furious or destructive. furious or destructive.


Tsunami is a Japanese word meaning ‘harbor wave’. It Tsunami is a Japanese word meaning ‘harbor wave’. It is constituted with two syllables, Japanese language is constituted with two syllables, Japanese language meaning harbour ("tsu", meaning harbour ("tsu", 津津 ) and ) and wave ("nami", ("nami", 波波 ).).

Tsunami is a wave train or series of waves generated, Tsunami is a wave train or series of waves generated, by impulsive disturbance that vertically displaces the by impulsive disturbance that vertically displaces the water column, in water body. Earthquake, landslides, water column, in water body. Earthquake, landslides, volcanic eruption, explosion and even the impact of volcanic eruption, explosion and even the impact of cosmic bodies like meteorites commonly generate cosmic bodies like meteorites commonly generate tsunami. Tsunami savagely attacks coastlines causing tsunami. Tsunami savagely attacks coastlines causing devastating property damage and loss of livesdevastating property damage and loss of lives..


Tsunami can be generated when the see floor abruptly deforms and vertically Tsunami can be generated when the see floor abruptly deforms and vertically displaces the overlying water. displaces the overlying water.

Tectonic earthquakes are a particular kind of earthquake that are associated Tectonic earthquakes are a particular kind of earthquake that are associated with the earth’s crustal deformation, when these earthquakes occur beneath with the earth’s crustal deformation, when these earthquakes occur beneath the see, the water above the deformed area is displayed from its equilibrium the see, the water above the deformed area is displayed from its equilibrium position. position.

Waves are formed as the displaced water mass, which acts under the influence Waves are formed as the displaced water mass, which acts under the influence of gravity, attempts to regain its equilibrium of gravity, attempts to regain its equilibrium


Droughts

• Droughts are long period of extremely dry weather when there is not enough rain for the successful growing of crops or the replenishment of water supplies.


Floods

• Floods are water covering previously dry area.• A flood is a very large amount of water that has overflowed

from a source such as a river, lake, and ocean. • They can also have overflowed a broken pipe onto a

previously dry area. • The damages after a flood is harsh because everything or

parts of things will be under water and the effects of a flood can kill many people.


Kinds Of Floods

Flooding can also be divided into different categories according to their location:Coastal FloodsCoastal Floods usually occur along coastal areas. When there are hurricanes and tropical storms which will produce heavy rains, or giant tidal waves created by volcanoes or earthquakes, ocean water may be driven onto the coastal areas and cause coastal floods. River FloodsThis is the most common type of flooding. When the actual amount of river flow is larger than the amount that the channel can hold, river will overflow its banks and flood the areas alongside the river. And this may cause by reasons like snow melt or heavy spring rain. Urban FloodsIn most of the urban area, roads are usually paved. With heavy rain, the large amount of rain water cannot be absorbed into the ground and leads to urban floods.


Benefits

There are many disruptive effects of flooding on human settlements and economic activities. However, floods (in particular the more frequent/smaller floods) can bring many benefits, such as recharging ground water, making soil more fertile and providing nutrients in which it is deficient. Flood waters provide much needed water resources in particular in arid and semi-arid regions where precipitation events can be very unevenly distributed throughout the year. Freshwater floods in particular play an important role in maintaining ecosystems in river corridors and are a key factor in maintaining floodplain biodiversity


Urban AreasRural Areas

Massive amounts of erosion can be accomplished by flood waters. Such erosion can undermine bridge structures, levees, and buildings causing their collapse.

Flooding of farmland usually results in crop loss. Livestock, pets, and other animals are often carried away and drown.

Water entering human built structures cause water damage. Even with minor flooding of homes, furniture is ruined, floors and walls are damaged, and anything that comes in contact with the water is likely to be damaged or lost. Flooding of automobiles usually results in damage that cannot easily be repaired.

Transportation systems may be disrupted, resulting in shortages of food and clean-up supplies. Food grains stored at home or in go-downs get wet and start rotting. In under developed countries food shortages often lead to starvation

Gas and electrical service may be disrupted. Water supply pipes/ system get damaged and wells get inundated creating shortage of drinking water.

The affected communities living in temporary shelters/ resettlements have limited or no access to safe drinking water, food etc. In addition, prevailing unhygienic sanitary conditions make it conducive for spread of food and water borne diseases.


Hurricanes • Hurricanes are several tropical storms that can

form in the Atlantic Ocean, Caribbean Sea, Gulf of Mexico, and in the Pacific Ocean.

• Hurricanes gather heat and energy through contact with warm ocean waters.

• Hurricanes are named so people can spot and identify them while they move across the ocean.

• Hurricanes that occur at the seas, and oceans cause large waves, heavy rain, and high winds. These things can cause destruction to international shipping and may cause many shipwrecks.

• Tropical cyclones is another name for hurricanes when it is at a certain level or at a certain size.

• Some hurricanes that have occurred are the Bombay Hurricane in 1882 in India, and Hurricane Katrina which happened in the United States.


Lighting storms and Thunderstorms

• Lighting storms and thunderstorms are basically the same thing.

• They both contain flashes of lighting striking an area and the effects of the lighting causes thunder.

• Sometimes during these storms, it also rains, snows or hails in certain cases.

• A lighting is caused when a electrical charge is contained in a cloud and then releases it on the earth’s surface. The temperature of a lighting bolts is extremely hot.


Tornadoes

• Tornadoes can happen when there is a thunderstorm. The color of tornadoes ranges from shades of gray, shades of brown, and white. Some times they are not that visible to see.

• A tornado is a dangerous rotating column of air which is connected to the surface of the earth and a clod. It destroys anything it touches in its path.

• Tornadoes are extremely destructive funnel-shaped rotating column of air that passes in a narrow path over land.

• Tornadoes can come in many sizes and shapes. The usual shape of a tornado is a funnel, which is seeable and is narrow end touches the earth’s surface.

•


Cyclones

• A cyclone is a large-scale storm system with heavy rain and winds that rotate counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere around and toward a low pressure center.

• Cyclones have also been seen on other planets other then the Earth, such as Mars, and Neptune.

• Some deadly cyclones that happened before are the Bhola cyclone in Bangladesh in 1970, the India cyclone in India in 1839, the Calcutta cyclone in India in 1737, and the Bangladesh cyclone in Bangladesh in 1991.


DISASTER MANGEMENT

Hazard Management Activities a. Disaster Mitigationb. Natural Hazard Predictionc. Emergency Preparednessd. Disaster Rescue and Reliefe. Post-Disaster Rehabilitation and Reconstructionf. Education and Training Activities


Disaster Mitigation

An accurate and timely prediction of a hazardous event can save human lives but does little to reduce economic losses or social disruption which can only be accomplished by measures taken longer in advance.

Mitigation of disasters usually entails reducing the vulnerability of the elements at risk, modifying the hazard-proneness of the site, or changing its function.


Natural Hazard Prediction

The prediction of a natural event can be done by scientific investigation into its causes and ensures establishing the probability of the next occurrence in terms of time, place, and range of severity. Increasingly sophisticated monitoring stations, both manned and remote, collect information of potentially hazardous events for more accurate prediction. Some hazards, such as hurricanes and floods, can be forecast with high accuracy, whereas it’s very difficult to forecast earthquakes or volcanoes or landslides.


Emergency Preparedness

Emergency preparedness is aimed at minimizing the loss of life and property during a natural event. Preparedness includes actions taken in anticipation of the event and special activities both during and immediately after the event.

Two levels of preparedness

Public safety information

Hazard awareness planning


Disaster Rescue and Relief

After a natural calamity, local residents usually undertake the first relief activities. However, their efforts must usually be complemented with those of national or regional authorities. The main activities of post-disaster relief include the preparation of lifelines or critical facilities for emergency response, training, disaster rehearsals, and the identification and allocation of local and external resources.


Post-Disaster Rehabilitation and Reconstruction

Post-disaster rehabilitation is carried out to restore the normal functions of public services, business, and commerce, to repair housing and other structures, and to return production facilities to operation.


Education and Training Activities

Education and training, both formal and informal, prepare people at all levels to participate in hazard management. Universities, research centers, and international development assistance agencies play the leading formal role in preparing individuals to face natural hazards. These activities are also carried out by operational entities such as ministries of agriculture, transportation, public works, and defense.


THANKS

natural calamities

Documents

free powerpoint

heavy rain

volcanic eruption

disaster rehabilitation

natural calamities

coastal areas

vertically

earths surface