LAPPING: The water was high at the boat sheds at Cornelian Bay yesterday. Picture: KIM EISZELE
YESTERDAY'S high tide might have been a king tide but it wasn't a monster one.
The combined gravitational pull of the moon and the sun guaranteed a higher than normal tide, followed by an extra-low tide.
But for a king tide to transform into the highest possible tide, extra forces must come into play.
They include storms that can push the sea harder against a coastline, low atmospheric pressures that add extra upward pull and large waves.
Oceanographer John Hunter said yesterday's king tide stopped about a metre below Sandy Bay's Long Beach sea wall and a one in 100 year monster tide could reach 70cm higher, with waves splashing easily over the wall.
Cars parked near the regatta grounds would have got an expensive wash and areas of Sandy Bay and Battery Point might have resembled Venice.
Dr Hunter was an author of a report, used by the State Govern- ment for its sea level rise planning response, that found as many as 620 homes could be affected by the next monster tide, and as many as 980 houses could be permanently inundated by 2100.
Sea levels had risen by 17cm in the past 100 years and were fore- cast to rise as much as 50cm by the end of the century.
bruce.mounster@news.com.au
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