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Blue holes are tidal but can have some very twisted relationships to the tides. Caves in karst plains tend to move in one direction unless there is a temporary disruption , like the breaking of an aquaclude. Springs, especially along rivers, can reverse and siphon when the level of the surrounding water rises. Speed of flow is definitely not only tidal ( moon pull ) , but dependent upon the hydrostatic head which can change locally, or at a great distance, but is most likely to change quickly locally, as in low tide at a resurgence into the Gulf where the head is coming from 50 miles away. -----Original Message----- From: Aldo P. Solari [APS] [mailto:aldo.solari@ho*.se*] Sent: Thursday, May 17, 2001 7:16 PM To: techdiver@aquanaut.com Subject: "reverse flow" Dear senior technical divers, I wonder whether anyone could explain the causes of the phenomenon of "reverse flow" occurring in caves. Does the "reverse flow" occur due changes in atmospheric pressure, tides, coreolli forces, venturi effects through the cave entrance or any other mechanism/s ? An interesting topic. Cheers, aldo.solari@ho*.se* www.ccbb.ulpgc.es/fish-ecology/solaris ___ -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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