Cyclone Nivar

GS 3 Disaster and disaster management

Introduction

         Tropical cyclone, also called typhoon or hurricane, an intense circular storm that originates over warm tropical oceans and is characterized by low atmospheric pressure, high winds and heavy rain.

Contemporary News:

  • According to the India Meteorological Department (IMD), Cyclone Nivar, which crossed the TN coast as a very severe cyclonic storm with wind speeds of 120 kmph and rain-filled.
    • further weakened as it moved inland.
  • The storm system is likely to move northwestwards and weaken into low pressure
  • Subsequently, Cyclone Nivar weakened into a cyclonic storm and further into a deep depression
    • centered about 50 km west-southwest of Tirupati.
  • Cyclone Nivar is the second cyclone to form over the Bay of Bengal this year after Super Cyclone Amphan.

Tropical Cyclones:

  • They are violent storms that originate over oceans in tropical areas and move over to the coastal areas bringing about large-scale destruction 
  • caused by violent winds, very heavy rainfall and storm surges.

Conditions: 

  • Large sea surface with temperature higher than 27° C.
  • Presence of the Coriolis force enough to create a cyclonic vortex.
  • Small variations in the vertical wind speed.
  • A pre-existing weak low-pressure area or low-level-cyclonic circulation is must for cyclone formation in tropics
  • Upper divergence above the sea level system.

Vulnerability of India to Cyclone:

  • Indian sub-continent is the worst affected region of the world.
    • having a coast line of 7516 kms
      • 5400 kms along the mainland
      • 132 kms in Lakshadweep 
      • 1900 kms in Andaman and Nicobar Islands
      • is exposed to nearly 10% of the world’s Tropical Cyclones.
  • 40% of the total population lives within 100 km of coastline.
  • More vulnerable to cyclone disasters
    • Four States (Andhra Pradesh, Odisha, Tamil Nadu and West Bengal) and one UT (Pondicherry) on the East Coast 
    • One State (Gujarat) on the West Coast

Benefits of Tropical Cyclones:

  • Relieve drought conditions: 
    • By bringing rain to the coastal areas, cyclones relieve the drought like conditions in the surrounding areas.
  • Maintain equilibrium in the Earth’s troposphere: 
    • They Carry heat and energy away from the tropics towards temperate latitudes
      • thus helps in maintaining equilibrium of the troposphere.
  • Cyclones help in maintaining a relatively stable and warm temperature worldwide.

Causes of destruction caused by Cyclones:

         There are three elements associated with cyclones that cause destruction during its occurrence. These are:

  • Strong Gusts/Squall:
    • These are very strong winds 
      • that accompany a cyclonic storm 
      • damages installation, dwellings, communications systems, trees, resulting in loss of life and property.
    • Gusts: 
      • These are short but rapid bursts in wind speed. 
      • These are the main cause of damage. 
      • Gusts are generally short-lived.
    • Squalls: 
      • A squall is a strong rise in wind speed which generally lasts for some time. Squalls generally associated with the bands of thunderstorms.
  • Torrential rains and inland flooding: 
    • more than 30 cm/hour 
    • Unabated rain gives rise to unprecedented floods.
    • Rain is a serious problem for the people who become less sheltered due to cyclones.
    • usually spread over a wide area and causes large scale soil erosion and weakening of embankments.
  • Storm Surge: 
    • It can be defined as an abnormal rise of sea level near the coast caused by a severe tropical cyclone
    • Seawater inundated low-lying areas of coastal regions 
      • drowning human beings and livestock
      • causes eroding beaches and embankments
      • destroys vegetation 
      • leads to a reduction of soil fertility.
  • Sudden Change in Regional climate: 
    • The ability of cyclone to bring in warmer air is high. 
    • So, the elderly and children in those areas have a high vulnerability to develop heat-related problems such as 
      • heat strokes.
  • Loss of Livelihood: The majority of the coastal people generally depend on fishing which is completely halted by cyclones.
  • Loss of economy: The economic loss is multifront from infrastructure loss, relief packages to people etc.

Challenges in Cyclones Management:

  • Bare minimum Technology: 
    • At the terminal-end generally lacks the equipment and communication back-up.
      • to deal with the situation effectively.
  • Lack of grass root level participation: 
    • There is a wider awareness gap there between disaster management from people’s end.
  • Multiple agencies: 
    • The IMD issues meteorological or weather forecasts while the Central Water Commission (CWC) issues flood forecasts at various river points. 
    • But cyclones bring the combination of problems, Before the integration of data, people on the ground lost the “golden time”.
      • Low data: The government has not measured the peak flows in the rivers and canals to plan remedies and also not documented data on annual flooding patterns.
      • Absence of land use norms has spawned an amorphous housing sector characterized by inflated, speculative prices but no foundation of civic infrastructure.
  • Poor Urban planning: Many Indian cities lacks poor urban planning which is highlighted by floods in Chennai and Mumbai.
  • Climate Change: There are many proven records that exist between the link between the higher frequency of disaster and climate change.

Government Initiatives:

  • Government is carrying out a National Cyclone Risk Mitigation Project (NCRMP) 
    • with the help of the World Bank 
    • for upgrade cyclone forecasting, tracking and warning systems in India.
  • Government is also implementing Integrated Coastal Zone Management Project (ICZMP) 
    • to improve national capacity for the implementation of comprehensive coastal management in India.
  • Government also separated Structural(includes construction)and non-structural measures for effective disaster management of cyclones

Way Forward 

  • The government should consider the NDMA Guidelines for the management of cyclones:
  • Ensemble Warning System(EWS): 
    • Establish EWS involving observations, predictions, warnings, and customized local level advice for decision-makers (national, state, district level) 
    • to manage the impact of the cyclone.
  • Commissioning of 
    • Aircraft Probing of Cyclone (APC) Guidelines calls for the combination of 
      • manned and Unmanned Aerial Vehicles (UAV) for critical observational data gaps.
  • Cyclone Disaster Management Information System (CDMIS): 
    • Establishing a comprehensive department for coverage of all management information and providing online services to the departments of Disaster management.
  • Specifying the roles and responsibilities in institutionalizing Cyclone risk mitigation with Developmental planning.
  • Community Based Disaster Management (CBDM): Guidelines asked to launch such activities in all villages of the 84 districts vulnerable to cyclones.

Conclusion            

 With the adverse Climate Change risks posted by IPCCreports the only option for India is to better prepare for the disaster with better urban planning, community awareness, etc.

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