# A perigean spring tide, also known as King tide, occurs during a Supermoon when the moon is closest to the earth (less than 3,60,000 km) during its orbit.
# Supermoons during the year 2015 are January 20 (new moon), February 18 (new moon), March 20 (new moon), August 29 (full moon), September 28 (full moon) and October 27 (full moon).
# Spring tides are especially strong high tides that occur during the full moon and new moon when the sun and moon are aligned with the earth, resulting in a collective gravitational pull on the earth’s water
What happens when spring tide coincides with high swell waves?
When spring tide coincides with high swell waves, it results in coastal erosion and flooding.
The perigean spring tide may coincide with high swell waves that originated in the southern Indian Ocean near Australia.
The swells occur almost every year with varying intensity. Triggered by turbulent weather conditions, swells are known to propagate northward to the Arabian Sea and Bay of Bengal, causing freak flooding along the southern Indian coast.
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