Safeguarding vessels against tornadoes

By Dr. M A Awal
2 June 2005, 18:00 PM
Most of the river and sea vessels are prone to the flurry of tornadoes and nor'westers due to the fact that the centre of gravity of the vessels become unstable and thereby swing sideways to the left/right like a pendulum. At the time of tornadoes/nor'westers, the balance of the centre of gravity of the vessels is lost and they can turn turtle by turning to either side and ultimately sink into the deep water. The other important reason is overloading the vessels with passengers and cargoes beyond their capacity. At the time of tornadoes/nor'westers, the natural tendency of the passengers is to seek shelter towards the side opposite to which the wind is flowing. This can be prevented if the curtains of the passenger berths in the vessels are properly planned and set in such a way that the ferocity of the tornadoes does not directly affect the passengers,

These water vessels are constructed to have narrow widths in order to gain high speed; unfortunately it makes the centre of gravity structurally unstable. This gain in speed achieved at the cost of stability inevitably leads to the shift of the centre of gravity of the vessels at the time of tornadoes/nor'westers.

The following technique, if implemented, could prevent the vessels from turning sideways and save lives. The idea is that all the vessels should be equipped with a set of small canoes or similar light objects such as foam (2 or 3 on each side) stationed on top deck tied with long vertical steel rods erected from the lower deck. These objects should be constructed and installed mechanically (preferably electronically also) so that at the onset of tornados/nor'westers, the captains/sarengs of the vessels can lower the objects with ease on the water on both sides of his vessel. This technique would surely make the centre of gravity of his vessel stable. There will be an additional advantage with the use of foam which when thrown on the water would soak enough water and thus prevent the vessels from swinging sideways. I would request the proper authority, the Ministry of Shipping and the Ministry of Science, Information and Communication Technology in particular, to take steps to implement the above technique. I hope this, if implemented, after performing some tests, could save many lives and prevent damage to property.

Dr M A Awal is Professor, Department of Physics, Jahangirnagar University.