The vibracoring option
What kind of sampling is required? Vibracoring is a good option under these conditions:
-- The sediment depth to sample is greater than 1 ft. (If less than 1 ft., consider grab sampling ).
-- The sediment depth to sample is greater than 1 ft. but less than 3 ft., and the bottom is very soft; gravity coring is a possibility.
-- Goal is to core to the maximum depth possible (down to 20 ft. or 6 meters) without using underwater drilling.
-- Water depth varies and may exceed 6 ft. (2 meters).
-- Need a continuous intact sediment profile.
-- Need to minimize "rodding" effects common to gravity, push, or hammer cores.
-- Require a larger volume of sediment (2 qt. or liters per ft. of core) for core subsamples.