The extent of devastation that Cyclone Amphan is prone to trigger within the coastal blocks and riverine areas of West Bengal will rely a lot on the landfall time and its synchronisation with the tidal timings, specialists have warned.
With the brand new moon scheduled on Could 22, scientists mentioned that the ‘spring tide’ section – when common tidal ranges are larger – has already began. Then there may be going to be the diurnal excessive tide that happens roughly each 12 hours. Over and above these, there can be storm surge that may be triggered by Amphan itself.
“Collectively these three might set off enormous waves within the rivers and sea that would create huge destruction. Mud embankments might collapse and sea water might gush in. Massive areas might get inundated,” mentioned KJ Ramesh, former director normal of the India Meteorological Division (IMD).
The IMD has warned that extraordinarily extreme cyclone Amphan, situated lower than 100 km south of the Bengal coast round 12:30 pm, might hit the coast someplace between Digha in south Bengal and Hatiya Island in Bangladesh with wind pace gusting as much as 185 km per hour – the highest pace of Vande Bharat Categorical, India’s quickest prepare.
“Storm surge of about Four-5 metres above the astronomical tide (spring tide and neap tide coinciding with new moon and full moon) is prone to inundate the low mendacity areas of South 24 Parganas and North 24 Parganas,” the IMD has warned in its bulletin.
On Wednesday, the primary excessive tide at Diamond Harbour in South 24 Parganas was recorded round 10 am. The following excessive tide will peak round 10:18 pm. The low tide is round 5:36 pm. The IMD has mentioned that the storm is anticipated to hit within the afternoon or night. Rain and gusty winds have already began battering the coast.
“When the storm makes a landfall, the winds will blow in a north to south path. If at the moment there may be excessive tide, then water will gush in from south to north and there can be head-on collision between the water and wind. It will deliver extra devastation,” mentioned Kalyan Rudra, chairman of the West Bengal Air pollution Management Board and a famous knowledgeable on rivers.
West Bengal had witnessed this phenomenon throughout cyclone Aila, which had hit the Sunderbans in Could 2009. It was excessive tide at the moment. There have been huge waves, the river embankments bought broken and sea water gushed into the villages leading to heavy lack of life and property.
“Bulbul, which struck in November 2019, additionally created harm due to its wind energy. However the harm attributable to waves was not a lot and the embankments didn’t break as a result of there was low tide at the moment. On Wednesday I heard that regardless of there was a low tide within the early morning the river water didn’t go down a lot within the Sunderbans as a result of storm water was gushing in with the approaching storm,” mentioned Tuhin Ghosh, director of College of Oceanographic Research at Jadavpur College.