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I generally agree, except at small choke-points like the one of the two openings to Puget Sound and San Francisco's Golden Gate. OK, the bottom currents can be a little less but are still screaming. I have even been in current in excess of 5 knots on the bottom in open sea off South Carolina. I wouldn't have believed it but that is what the Captain calculated it based on our hot-jump and pick-up points. It was before GPS so measurements were based on Radar.
Hang-off for decompression was impossible so we had to hang off a small drifting inflatable at our 20' O2 stop. The dive was useless except the ride was rt of fun.
Although I generally agree with previous postings, laminar flow accompanying internal waves, as described by Bill, is more appropriate for open water conditions. The thelaminar flow breaks down when the currents (or internal waves) interact with the sea floor topography. For example, if we place velocity sensors across a reef with substantial currents, we it would not be surprising to record substantial changes in the magnitude and direction of the currents. In addition, surface current direction may not always match conditions at depth. Lastly, Akimbo is on the mark, where water is forced through constrictions, currents will substantially change between along a vertical profile in the water column.
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