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  • Writer's pictureHamsen B Paramahamsa MSc geology

Sea Level Rise and water lost per m² on land. Taken average across the Land

Approximate calculation for orientation. It is the world average taking all water phases worldwide, including glaciers, Icebergs, and underground losses etc.

Sea Level Rise and Sea Invasion

Author: Hamsen B Paramahamsa MSc

The ratio Land to Sea on this Earth could be roughly stated as 1:2 for calculation purpose. And according to need, to improve accuracy, one can vary it after satellite measurements. However, the difference will be only fractional oscillating about 1%. Besides, the ratio 1:2 is never permanent. It keeps on varying even daily and in future the measures will go in favour of the seas and oceans. But during the next decade, due to high awareness, the area will increase in favour of the lands.

The Sea Level Rise at present

Many stations worldwide and even satellite measurements from many countries have a rough estimation of 1cm of sea level rise per year.

From the estimation of the present rise of 1cm of the sea level one can deduce that the earth’s Landmass is losing 2cms water in height. An average across diverse landscapes, glaciers and icebergs stuck on the landmass. Floating Icebergs while freezing or melting does not change sea level.

It could be pictured that the loss 2cm of height of water comes from deforestations, agriculture, lakes, rivers, soils, glaciers, underground waters and even from drying of air, constructions for living and many other factors.

One square metre of water with a height of 1 cm has:

100 x 100 x 1 ---> 10,000 c.c. of water. Which is 10 litres. It is, the seas are gaining through different tracks 10 litres of water per m2 of sea per year.

Based on the gain of water of the seas per year as 1cm, it is reckonable that a square metre of land is losing 20 litres of water per year.

1 Perch 25 m2. The amount of water lost per perch at 1cm sea level rise = 50 litres this year.

1 acre 4047 m2 loses 4047 x 20 litres = 80,940 litres = 80 m3/year

1 hectare 10,000 m2 loses 10,000 x 20 = 200,000 litres this year = 200 m3 this year.

1 KM2 = 1000 x 1000 m2 = 106 m2 or one million m2 loses 106 x 20 litres = 206 litres = 20,000 m3 this year.

Sri Lanka has approximately 65,610 km2

One square kilometre in an average across all landscapes, loses about 20,000 m3 of water this year. Therefore, Sri Lanka loses at least 65,610 x 20,000 m3 = 1312200,000 = 1312200 x 103 m3 = 13122 x 105 m3 of water this year.

= 1,312,200,000 m3 of water will be given to the seas up until end of this year by Sri Lanka. It is more than 1.3 billion cubic metres of water. This is approximate world average including glaciers, icebergs, and underground waters etc.. This calculation is meant for the sake of orientation and to seek eventual methods to avert Sea Level Rise.

From this orientation calculation easy methods that have also advantages in the normal life could be taken to avert this problem. If public blessing did exist, SL can take the lead to avert Sea Level Rise.

Once the lead to avert Sea Level Rise is taken by SL, other countries could be compelled and those not complying could be called for taxes because they harm the complying innocent countries.

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