Gravity Coring with Dynamic Dredging

This sounds like a really exciting project with a great bit of kit. Looking forward to meeting Elyssa soon and hearing about her results

The Mighty Murray River

In March we conducted some gravity cores off a barge with the help of the boys from Dynamic Dredging. Conventionally this coring technique is used with deep sea vessels where a steel barrel pipe is lowered close to the sea floor with 200+kg’s of lead weights mounted on top, and then released, letting gravity ‘pile-drive’ the core barrels into the ground. A piston within the core barrel and core catcher prevent the sediment from falling out of the barrel as it’s winched up from the seafloor.

We gave this a go on the Murray at Younghusband near D.Brinkley’s Sand Supplies, at the channel margins and in the centre of the river channel. In principal it worked, however the age of our gear (from the 1960’s) prevented any deep cores, and with a 6 metre core barrel we only retrieved around 3 metres (piston basically got stuck halfway up the barrels…

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