To sample wet sediments it needs to be done in one sample because the hole collapses after the sampler is removed.
These include: The Gouge Auger, the Undisturbed Wet Soil Sampler (UWS), the Piston Sampler, and the Russian D-Sampler.
The Gouge Auger, the Undisturbed Wet Soil Sampler (UWS), the Piston Sampler, and the Russian D-Sampler.
Gouge Auger - This is designed to take undisturbed samples from very soft and preferably very wet soils. It is a tapered stainless steel tube with one side cutaway.
Piston Sampler - These are available as 2 main versions, the Surface type, and the Down Hole type. Both have a moving piston that creates suction inside the sample tube.
Russian D Sampler - The Russian D-Sampler is used in very, very soft, and wet conditions like swamps and can sample at any given depth. The sampler is made from a half-tube (longitudinally) of stainless steel with a one-pointed aluminum end, a cover flap (blade), and a connection for extension rods.
Undisturbed Wet Soil Sampler - This sampler is for obtaining undisturbed samples in water-saturated materials and retains the sample inside a removable soft clear plastic tube and uses a plastic sample retainer (split-fingered one-way valve).