Numerous data have been collected from the Ministry of Earth Sciences indicating that four ports in India are experiencing an unexpected rise in sea levels. This elevation is alarmingly higher than the global average. These ports are Diamond Harbour, Kandla, Haldia, and Port Blair.
The Reality: Rate of Sea-Level Rise
Recent scientific investigations have ascertained that during the past 40-50 years, there has been an estimated increase in sea level of 1.3 mm/year along the Indian coasts. However, in Diamond Harbour, the rise is nearly five times higher than this figure, coming to about 5.16 mm per year.
The Impact in West Bengal
The increase in sea levels has been observed to be even higher in West Bengal, especially in the Sunderbans delta. This is predominantly due to the process of deltaic sediment deposition, which is caused by the combination of freshwater and saline water.
Correlation with Global Warming
The fifth assessment report of the International Panel on Climate Change reveals a strong connection between rising sea levels and global warming. The global sea level has indeed been increasing at an average speed of 1.8 mm each year throughout the last century.
| Location | Sea Level Rise (mm per year) |
|---|---|
| Global Average | 1.8 |
| Diamond Harbour | 5.16 |
| India’s Coasts | 1.3 |
The Dangers of Rising Sea Levels
Increased coastal risks such as storm surges, tsunamis, coastal floods, high waves, and coastal erosion in the low-lying coastal areas are all adverse impacts of rising sea levels. Additionally, the slow but steady loss of coastal land to the sea has also been noticed.
Trends in India’s Climate
Studies focusing on India have revealed a discernable warming trend. On an all-India average basis, this warming trend is approximately 0.6°C. The continual escalation in these figures indeed poses a significant concern for the future of the country.
