LIFE UNDER THE WAVES
Day 681, Rapid Bay Looking Good by robertrath Anyone who has dived Rapid Bay Jetty over the last 6 weeks would know how bad the visibility has been.

There have been days there when you could not see more than 50cm through the milky brine which always seems to follow a period of northerly fetch. I have heard many different opinions on why the visibility here is so changeable. Some people suggest that it has been ‘bad’ since the new jetty was built a few years ago due to disturbance of the sea bed however I can remember these ‘milky’ days from when I first started diving and the original jetty was still intact and in use.

My thoughts are that the ‘milk’ is cause by colloidal gypsum, a legacy of years of gypsum loading here and the the long term exposure of the area to gypsum dust both directly and through run-off.
I am sure the sea bed surrounding the area is loaded with this super fine gymsum. A prolonged northerly fetch creates a ground surge which lifts the dust back into the water making it milky blue.

The visibility here is very good at the moment at around 10-15m. It’s an odd kind of visibility with the the milkiness still there but at least now you can enjoy the old wives swimming among the pylons.

Photo: Robert Rath, ‘Day 681, Rapid Bay Looking Good’, 1/160s f/11 ISO640 22mm+2D

… more at http://wetshutter.com

Day 681, Rapid Bay Looking Good by robertrath Anyone who has dived Rapid Bay Jetty over the last 6 weeks would know how bad the visibility has been.

There have been days there when you could not see more than 50cm through the milky brine which always seems to follow a period of northerly fetch. I have heard many different opinions on why the visibility here is so changeable. Some people suggest that it has been ‘bad’ since the new jetty was built a few years ago due to disturbance of the sea bed however I can remember these ‘milky’ days from when I first started diving and the original jetty was still intact and in use.

My thoughts are that the ‘milk’ is cause by colloidal gypsum, a legacy of years of gypsum loading here and the the long term exposure of the area to gypsum dust both directly and through run-off.
I am sure the sea bed surrounding the area is loaded with this super fine gymsum. A prolonged northerly fetch creates a ground surge which lifts the dust back into the water making it milky blue.

The visibility here is very good at the moment at around 10-15m. It’s an odd kind of visibility with the the milkiness still there but at least now you can enjoy the old wives swimming among the pylons.

Photo: Robert Rath, ‘Day 681, Rapid Bay Looking Good’, 1/160s f/11 ISO640 22mm+2D

… more at http://wetshutter.com

  1. rhy-iah reblogged this from soltry
  2. wisterianviolet reblogged this from lifeunderthewaves
  3. me-you-and-summer reblogged this from delightfullchild
  4. delightfullchild reblogged this from thegreenwolf
  5. dijomuerte reblogged this from thegreenwolf
  6. bkasdf reblogged this from illuminated-martyr
  7. illuminated-martyr reblogged this from singularemonstrum
  8. afishypassion reblogged this from leelovesfish
  9. leelovesfish reblogged this from thelovelyoceancreatures
  10. sabelmouse reblogged this from thegreenwolf
  11. narutofreak1089 reblogged this from washingtontn-washingtondc
  12. beastmegs reblogged this from thesmashbruh
  13. thesmashbruh reblogged this from fightingdepressiondaily
  14. fightingdepressiondaily reblogged this from renaryoku
  15. renaryoku reblogged this from coolstoryfuckface
  16. highonpoprocks reblogged this from garrettchow
  17. onlyyourkinglogy reblogged this from gravitationalbeauty
  18. ssluvsmusic reblogged this from radfux
  19. radfux reblogged this from mind-of-a-mavrik
  20. cat-nado reblogged this from coolstoryfuckface
  21. peacefromwithinyou reblogged this from coolstoryfuckface
  22. mind-of-a-mavrik reblogged this from normalprincess
  23. wallflowerari reblogged this from coolstoryfuckface
  24. mexicanleprechaun reblogged this from normalprincess
  25. normalprincess reblogged this from coolstoryfuckface
  26. mojo-stay-dope reblogged this from coolstoryfuckface
  27. xfailingxmindsx reblogged this from coolstoryfuckface
  28. apolaustical reblogged this from craving-the-sea
  29. singularemonstrum reblogged this from coolstoryfuckface
  30. ethan-may reblogged this from gravitationalbeauty
  31. hippiecheen reblogged this from beware-of-darknesss
  32. craving-the-sea reblogged this from coolstoryfuckface