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Random tides in Perth?

Created by Simsurf > 9 months ago, 28 Apr 2013

WA

239 posts

Hi brains trust,

Having lived in WA for 16 years, I have always wondered why the tides seem so ad hoc. Growing up surfing in QLD, we had roughly 4 tides a day, 6 1/4 hours apart.

Can anyone tell me why it's so random in Perth? Sometimes only one tide per day......WTF

Simon

Dawn Patrol

WA

1991 posts

Dawn Patrol

WA, 1991 posts

Most parts of the world have a semi diurnal tide.which is 1high every 12ish hours.

Perth however has a diurnal tide, which is one high/day. Not sure why, but it is probably some complicated physics thing. Or a conspiracy...

Luma

WA

169 posts

Luma

WA, 169 posts

Dawn Patrol said...
Most parts of the world have a semi diurnal tide.which is 1high every 12ish hours.

Perth however has a diurnal tide, which is one high/day. Not sure why, but it is probably some complicated physics thing. Or a conspiracy...

Maybe so you can't tell if a tsunami is coming. Oops sorry forget on BOM the photo/picture/diagram shows we aren't in the tsunami watch area so we couldn't possibly get a tsunami.

Dawn Patrol

WA

1991 posts

Dawn Patrol

WA, 1991 posts

Luma said...

Maybe so you can't tell if a tsunami is coming. Oops sorry forget on BOM the photo/picture/diagram shows we aren't in the tsunami watch area so we couldn't possibly get a tsunami.

I'm pretty sure Perth is relatively safe from earthquake tsunamis due to its location and the shape of the ocean floor.

This little pdf is a bit of a summary of a preso I went to, but can't seem to find the main powerpoint.

~~http://www.wamsi.org.au/sites/default/files/Tsunami%20impacts%20on%20Western%20Australia%20Final_0.pdf~~

Luma

WA

169 posts

Luma

WA, 169 posts

Dawn Patrol said...

Luma said...

Maybe so you can't tell if a tsunami is coming. Oops sorry forget on BOM the photo/picture/diagram shows we aren't in the tsunami watch area so we couldn't possibly get a tsunami.

I read that some campers in Sharks bay almost lost their lives. Was thinking the other day that Mandurah would get taken out by a tidal surge. When next is that thing that happens with the moon and high tides?