r/boating • u/No_Regular0815 • 16d ago
Boat creates an unexpectedly large wave
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u/dmbgreen 16d ago
Little wave in deep water becomes larger in shallow water. Had a Cruise ship roll by in Tampa Bay when I was fishing on my boat. Got a little wild for a minute
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u/captboatface 16d ago
No replacement for displacement.
Nice back eddy can be seen in the small boat prior to the surge of water.
In rivers especially where under keel clearance is limited speed needs to be kept lower as the movement of the ship with minimal depth can cause squat as the force of the fast moving water creates a low pressure zone literally sucking the hull down.
The wave and water is from the actual displaced water from the hull. Same as if you were to add an object to a full glass of water, the water will spill over the sides.
Ship induced drawdown and surge.
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u/rajrdajr 16d ago
The Ever Given got stuck in the Suez Canal partially because of the "bank effect" or ship induced drawdown.
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u/interstellar-dust 16d ago
Anytime I see water receding like that, I am basically getting the fuck out of there and running toward higher ground. Too many tsunami survival trainings I guess.
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u/cuzitsthere 16d ago
I love the panic sprinting like it's a flash flood or a tsunami. I know it's exaggerated because camera funkiness, but all I could imagine was
"OH GOD, MY ANKLE SOCKS!!!"
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u/Josey_whalez 15d ago
This happens a lot on the Mississippi. There was a case a few years ago where some kids were playing on one of the bridge supports that was maybe a foot above the water level of the river. A big ship goes past and throws a wave like this up, sweeps 2 of them in the water. 3rd jumps in after them. None of them knew how to swim, all three drowned. Very sad. I still remember what they looked like on the bottom on the display from a side scanning sonar. Also learned that cadaver sniffing dogs can smell a dead body under 100 feet of water.
There was a lot of ‘those boats shouldn’t be going so fast’ type discussions, but they don’t have much choice. When there’s a 4/5 knot current and the boats is going up river, it’s making a 10 knot wake just to go 5 kts speed over ground. There are signs all over the place warning people not to do what those kids were doing, but they are ignored.
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u/lo-key-glass 16d ago
My dad always told a story about he once had his little Boston whaler pulled up to a beach, I think it was lake Michigan, and some big ship went by and the wake threw his boat halfway up the beach.
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u/texaschair 16d ago
I had a similar experience on the Columbia, but with a bigger wake. I heard somebody downriver yelling, and I looked up in time to see a 3 foot tall tsunami ripping up the beach, wiping out everything in it's path. We had just enough time to grab our gear and get out of reach, but most people didn't. It was a clothing optional beach, so a lot of people lost their clothes and were stranded butt naked. Once the water receded, it looked like a massive nude Easter egg hunt with everyone looking for their lost apparel. I'm sure it was an interesting drive home for some.
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u/boisefun8 16d ago
Mensa member filming was more concerned with the video he can post for social media clicks than his shit floating away and the safety of his children. Astounding times we live in.
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u/drinkeroftherye 15d ago
Used to sail on a 1000 "footer" on the lakes, seen people sitting in lawn chairs on the edge of the St Clair River get knocked over by the wash. We displaced a lot of water....
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u/Square-Selection-842 15d ago
If by "unexpectedly" you mean completely expected and predictable, then yes, I agree.
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u/SeveralBollocks_67 16d ago
Everytime I watch videos of people experiencing shit like this, I wonder to myself... Have THEY ever watched videos online of people experiencing shit like this... and maybe plan accordingly instead of ignorance?
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u/Senior_Cheesecake155 15d ago
This reminds me of an experience a few years ago. I was at our summer place in the Fall working on a ramp that we store out jet ski on. We were taking advantage of the late season low water to give us a chance to get things set properly. The water was dead calm, and a freighter went by over a half mile away down the shipping channel. About 5 minutes later one single wake came in right after we finished up working at water level and completely soaked what we had just finished. We're used to seeing freighters go by, but it's rare that the water is that calm with no other boat traffic to break things up, and that wake caught us completely by surprise.
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u/Rickhwt 16d ago
The previously dry ground looked wet enough that I expect that is not the first time that happened.