A mini-corer for relative soil strength studies

A mini‐corer for precision sampling of the water‐sediment interface in subglacial lakes and other remote aqueous environments

“…A number of “standard” corer types however have developed over time and are grouped primarily on the differentiating characteristic of their operating mode. Gravity corers (Livingstone ; Hopkins ; Young et al ; Blomqvist ; Jahnke and Knight ; Glew et al ; Kristoffersen et al ) that use a mass to drive the core tube into the sediment, drill‐tipped corers (Dickens and Kai‐Uwe Hinrichs ) capable of taking long‐rock samples, percussion corers where a mass is repeatedly used to drive a core barrel further into the sediment(Glew et al ), push corers which are typically pushed into the sediment by a vehicle or operator for exploratory sediment work, and piston corers (Livingstone ; Cushing and Wright ; Wright ; Glew et al ; Feek et al ; Abegg et al ) where the extending core barrel, coupled with a static piston, encloses the sample.…”

“…Driving the core tube into the sediment can be achieved in many ways; using a mass to overcome the shear strength of the sediment, thereby penetrating it, as typically used in gravity corers (Livingstone ; Hopkins ; Young et al ; Kristoffersen et al ); percussion mechanisms; vibration mechanisms such as on vibracorers (Glew et al ); or static weight from a seabed frame (a form of gravity coring) (Jahnke and Knight ; Lunne and Long ). The Mackereth sampler (Mackereth ) drives a core barrel using compressed air.…”

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“…A number of "standard" corer types however have developed over time and are grouped primarily on the differentiating characteristic of their operating mode. Gravity corers (Livingstone 1955;Hopkins 1964;Young et al 1990;Blomqvist 1991;Jahnke and Knight 1997;Glew et al 2001;Kristoffersen et al 2006) that use a mass to drive the core tube into the sediment, drill-tipped corers (Dickens and Kai-Uwe Hinrichs 2003) capable of taking long-rock samples, percussion corers where a mass is repeatedly used to drive a core barrel further into the sediment (Glew et al 2001), push corers which are typically pushed into the sediment by a vehicle or operator for exploratory sediment work, and piston corers (Livingstone 1955;Cushing and Wright 1965;Wright 1967;Glew et al 2001;Feek et al 2006;Abegg et al 2008) where the extending core barrel, coupled with a static piston, encloses the sample.…”

“…Driving the core tube into the sediment can be achieved in many ways; using a mass to overcome the shear strength of the sediment, thereby penetrating it, as typically used in gravity corers (Livingstone 1955;Hopkins 1964;Young et al 1990;Kristoffersen et al 2006); percussion mechanisms; vibration mechanisms such as on vibracorers (Glew et al 2001); or static weight from a seabed frame (a form of gravity coring) (Jahnke and Knight 1997;Lunne and Long 2006). The Mackereth sampler (Mackereth 1958) drives a core barrel using compressed air.…”