INCOIS found a method of improving wave forecast ’

  • Category
    Geography
  • Published
    17th Aug, 2020

Researchers at the Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, have found a method of improving wave forecasts. They have ascertained that certain phases of boreal summer intra seasonal oscillation or BSISO induce high-wave activity in the northern Indian Ocean and Arabian Sea.

Context

Researchers at the Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, have found a method of improving wave forecasts. They have ascertained that certain phases of boreal summer intra seasonal oscillation or BSISO induce high-wave activity in the northern Indian Ocean and Arabian Sea.

How they did it?

  • The team worked with data on Indian ocean waves such as their height, period, and surface winds over a span of 38 years from 1979-2017.
  • By using mathematical data analysis models, the research team studied the relationship between various phases of BSISO and the height of waves in the Indian Ocean.
  • They found that waves induced by active phases of BSISO are nearly 0.5 meters higher than those which occur during other phases of BSISO.
  • The active phases of BSISO occur between June to August which are the monsoon summer months.

What is Boreal Summer Intra-Seasonal Oscillation (BSISO)?

  • Boreal Summer Intra-Seasonal Oscillation (BSISO) is the movement of convection (heat) from the Indian Ocean to the western Pacific in roughly every 10–50 days of the monsoon season from June to September.
  • BSISOs represent monsoon’s ‘active’ and ‘break’ periods, in which weeks of heavy rainfall give way to brilliant sunshine before starting all over again.
  • The active phase also enhances monsoon winds and hence the surface waves.

What are waves?

  • Waves are actually energy passing through the water, causing it to move in a circular motion.
  • When a wave encounters a surface object, the object appears to lurch forward and upward with the wave, but then falls down and back in an orbital rotation as the wave continues by, ending up in the same position as before the wave came by.
  • If one imagines wave water itself following this same pattern, it is easier to understand ocean waves as simply the outward manifestation of kinetic energy propagating through seawater.
  • In reality, the water in waves doesn’t travel much at all. The only thing waves do transmit across the sea is energy

Significance of the findings

  • Better forecast: The finding will help to improve wave forecasts in the Indian coastal region and help mitigate the adverse impacts of high waves such as coastal flooding and erosion. This finding has a great significance in developing seasonal and climate forecast service for waves and coastal erosion for India.
  • Effective planning: It will also aid better planning of sea navigation routes in the northern Indian Ocean waters.
  • Efficient coastal and marine management: Wave forecast advisories based on the BSISO would be more useful for efficient coastal and marine management
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