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Consider the following statements with reference to the swell wave:
1. It is the formation of long wavelength waves on the surface of the sea.
2. It has a narrower range of frequency and direction than locally generated wind waves.
3. It is formed due to the presence of local winds.
Which of the statements given above is/are correct?
- a)1 and 2 only
- b)2 only
- c)1 and 3 only
- d)1, 2 and 3
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements with reference to the swell wave:1. ...
Recently, swell waves inundated coastal areas in central and southern districts of Kerala.
- A swell is the formation of long wavelength waves on the surface of the sea. These are composed of series of surface gravity waves.
- Formation:
- They occur not due to the local winds, but rather due to distant storms like hurricanes, or even long periods of fierce gale winds.
- During such storms, huge energy transfer takes place from the air into the water, leading to the formation of very high waves. Such waves can travel thousands of kilometres from the storm centre until they strike shore.
- Features
- Swells have a narrower range of frequencies and directions than locally generated wind waves, because swell waves have dispersed from their generation area, have dissipated and therefore lost an amount of randomness, taking on a more defined shape and direction.
- These waves can propagate in directions that differ from the direction of the wind, in contrast to a wind sea.
- Their wavelengths may rarely exceed more than 150 m. Swell wavelength, also, varies from event to event. Occasionally, swells which are longer than 700 m occur as a result of the most severe storms.
- It occurs without precursors or any kind of local wind activity.
- In India early warning systems like the Swell Surge Forecast System launched by the Indian National Centre for Ocean Information Services (INCOIS) in 2020 — gives forewarning seven days in advance.
Hence option a is the correct answer.
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Community Answer
Consider the following statements with reference to the swell wave:1. ...
Explanation:
Formation of Swell Waves:
- Swell waves are long wavelength waves that have traveled out of their generating area.
- They are typically formed by distant storms or persistent winds over a large area of the ocean.
Characteristics of Swell Waves:
- Swell waves have a narrower range of frequency and direction compared to locally generated wind waves.
- They travel long distances with little loss of energy, making them distinct from wind waves.
Relation to Local Winds:
- Swell waves are not formed due to the presence of local winds, as stated in statement 3.
- Local winds primarily generate wind waves, which have a different set of characteristics than swell waves.
Therefore, the correct statements are 1 and 2. Swell waves are indeed the formation of long wavelength waves on the surface of the sea and have a narrower range of frequency and direction compared to locally generated wind waves.
Formation of Swell Waves:
- Swell waves are long wavelength waves that have traveled out of their generating area.
- They are typically formed by distant storms or persistent winds over a large area of the ocean.
Characteristics of Swell Waves:
- Swell waves have a narrower range of frequency and direction compared to locally generated wind waves.
- They travel long distances with little loss of energy, making them distinct from wind waves.
Relation to Local Winds:
- Swell waves are not formed due to the presence of local winds, as stated in statement 3.
- Local winds primarily generate wind waves, which have a different set of characteristics than swell waves.
Therefore, the correct statements are 1 and 2. Swell waves are indeed the formation of long wavelength waves on the surface of the sea and have a narrower range of frequency and direction compared to locally generated wind waves.
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Consider the following statements with reference to the swell wave:1. It is the formation of long wavelength waves on the surface of the sea.2. It has a narrower range of frequency and direction than locally generated wind waves.3. It is formed due to the presence of local winds.Which of the statements given above is/are correct?a)1 and 2 onlyb)2 onlyc)1 and 3 onlyd)1, 2 and 3Correct answer is option 'A'. Can you explain this answer?
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