Recreating sea storm on a mini level at the selected area of the sea floor.

[edmund.bonnevie]

I need to agitate sand/small pebbles at the depth of 10 - 15 meters.

Best way to describe what I would like to do is (in such order):

1. Recreate sea storm on a mini level at the selected small area of the sea floor.
   
   
2. Pressure wash small area of the sea floor.

What can I do to achieve that?

Best I figured by now would be to use submersible water pump, sucking the sea water and releasing it at 8500 l/h or 40 gal/min onto pointed surface. But I have yet to find a pump that has specs for that. Preferably, powered by batteries (12, 24, 32 or 48V system)

For example this pump has a submersion depth of 7 m (Not sure what would happen to it if it went deeper, considering power cord would allow, collapse from pressure?)

Other dumb ideas/words that crawl into my head are: turbine, fan, submerged jet ski, an army of Pufferfish, ...

If you have any ideas or suggestions, please let me know. Thank you. Oh, yes, I'm on a budget.

Edit: I would use water pump in reverse. It will sucking sea water from one end and blow pretty strong jet of water from another, creating needed turbulence.

Edit: The dredge would not work because it sucks rather than blows