Vibracore processing
How a sediment vibracore is processed depends entirely on the project objectives. If the goal is to treat the core as a single homogenized sample, the whole core can be shaken or vibrated out of its tube directly into a mixing tub. If that volume is too great, or if the core needs to be sub-sampled, then the tube may be split open lengthwise. A variety of power tools are available for cutting open thin-walled metal or plastic tubes: circular saws, vibrating saws, shears and routers. One important consideration is the possible impact of the tool on the core structure or sample quality. The general idea is to barely slice through the tube wall and not cut significantly into the core itself. Another consideration is personal safety when cutting along a hard, slippery, curved surface. A good compromise for cutting thinner-walled plastic tubes is the vibrating saw, which is relatively safe and creates no loose fragments. A hooked-blade hand tool may work as well.
After the full length of the tube (including end caps) is cut along opposite sides, the core itself can be bisected. This is best done by inserting a series of clean metal blades (6 x 12 in., 18 guage stainless steel) end to end, along the core axis, and using these to pry the core open all at once. This preserves the vertical structure of the core, and prevents smearing sediments between different zones. With the interior of the core exposed full length, its structure, color, etc. can be photographed, described and sub-sampled.
To create more controlled conditions on site, the core processing station can be set up in a box truck with an overhead door to insure good access and ventilation.
