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ARY
07-22-2008, 12:39 PM
What is the known annual rate of reduction in height of the Lips restriction?

What u/w caves here in FL have are the most changing topographically due to geological/hydrological events? We all heard of caving ceilings and sediment mound movements so which caves live the most "active" lives?
Gary
07-22-2008, 12:57 PM
I'm sure that regardless of the rate of closure caused by nature the opening in the area used by divers is being worn wider much faster then it is narrowing.
Capt Tim
07-22-2008, 02:38 PM
I'm thinking that information has not been recorded. Don't worry, you can always take the bypass.

Capt Tim
aw
07-22-2008, 03:41 PM
What is the known annual rate of reduction in height of the Lips restriction?

Would a botox injection help?
FW
07-22-2008, 04:08 PM
Would a botox injection help?

:roll:

FWIW, Gary is right, the Lips are at least 3" Higher than they were 30 years ago. The worst Diver "erosion" I know of are the "restrictions" known as Peanut, and Half-hitch.
cavediver27
07-22-2008, 05:46 PM
:roll:

FWIW, Gary is right, the Lips are at least 3" Higher than they were 30 years ago. The worst Diver "erosion" I know of are the "restrictions" known as Peanut, and Half-hitch.

Have to agree with you on that! In fact the "erosion" is such that they really aren't restrictions any longer.
Diverlee
07-22-2008, 06:10 PM
Why would the lips be higher?
( I was thinking higher from the bottom, not "wider" )
aainslie
07-22-2008, 06:37 PM
Because tanks are harder than tummies.
Webmaster
07-22-2008, 07:59 PM
What is the known annual rate of reduction in height of the Lips restriction?

What u/w caves here in FL have are the most changing topographically due to geological/hydrological events? We all heard of caving ceilings and sediment mound movements so which caves live the most "active" lives?

Just curious, but why would you think it would be getting smaller? Cave development is by definition the removal of material. Now there are secondary processes such as sedimentation or breakdown modification that may reduce the effective passage size. But these are neither global nor constant.

Big rooms in caves often depend on breakdown and the subsequent weathering away of that to achieve their large size.

Even the 'softer' parts of you will scrape away some of that soft FL limestone.

Marbry
Slüdge
07-22-2008, 09:51 PM
Just curious, but why would you think it would be getting smaller?

I don't know, but first I was going through the Lips in doubles. Then in doubles and a stage. Now doubles, a stage, and a scooter. They sure seem to be getting smaller to me!
Gary
07-22-2008, 10:27 PM
The worst Diver "erosion" I know of are the "restrictions" known as Peanut, and Half-hitch.

The "restriction" at the end of the roller coster (p1200') is an inverted trapazoid at least 6" deeper then 10 years ago (when is was a small round depression). The inverted trapazoid is, of course, not natural but caused by frog kicks thru the ex-restriction.

The backmount entrance to upstream cow was once so tight that removing tanks or going thru on a single was necessary in most cases.

And the Harper tunnel at Little River now goes several hundred feet farther then it used to now that the former "end" of the passage is worn large enough that no one would question the ability of a backmount diver to pass.


Peanut, and Half-hitch are worse?!?