Sampling in the Marine Environment
In order to confirm observations made with side-scan sonar, on the nature of the seabed, to identify benthic macrofauna, or to carry out chemical or microbiological analyses, the use of grabs is an effective way to collect sediments.
Principle
Sampling provides material for sediment, benthic fauna or water-quality studies. The sampling plan defines the locations, number of samples, equipment and handling requirements according to the study objectives.
The representativeness of the results depends on this sampling strategy and the variability of the survey area.
Equipment
CERES uses Shipek and Van Veen grabs for sediment sampling and a Niskin bottle for water sampling. The equipment is selected according to the material to be collected and the intended analyses.
VAN VEEN GRAB
The Van Veen grab collects surface sediments for particle-size analysis and other sediment studies. It is lowered open from the vessel’s winch and closes when the cable is hauled after contact with the seabed.
Capacity of the equipment presented: 75 L
Penetration: up to 30 cm, depending on the sediment
The sampling protocol is adapted to the planned analyses.
SHIPEK GRAB
The Shipek grab collects unconsolidated surface sediments using a rotating bucket triggered on contact with the seabed. It supports rapid characterisation of the recovered sediment.
Capacity of the equipment presented: 3 L
Penetration: up to 10 cm, depending on the sediment
Samples are handled according to the study and laboratory requirements.
NISKIN BOTTLE
The Niskin bottle collects water at a selected depth. Samples are then prepared and sent to an analytical laboratory according to the required protocol.
Depending on the mission, measurements such as temperature or dissolved oxygen can also be taken on board.
Contact CERES to plan water and sediment sampling alongside your seabed surveys.
