Sampling

January 29th, 2008

Material:

- Piston core (from Mooring systems)

- 10 feet long pvc tube (3.87″ exernal diameter)

- lader

- wood plateform (light and solid) with a hole drill in the middle)

Samples:

- 1 creek bank 2.5 m non compacted (less than 4%)  and undisturbed sediment core (clay material)

- 1 upland 1.5m  non compacted (less than 4%)  and undisturbed sediment core (sand layer was reach approximately at 1m depth)

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The coring team:

from left to right: Daniel, Jon, Meg and Christelle.

New reactors drawing….

September 25th, 2007

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Sapelo Island, Moses Hammock marsh.

August 15th, 2007

We used an AMS sludge core device (3 1/4 ” x 12 ” Sludge Sampler Cylinder Body + 3 1/4 ” Sludge Sampler - Solid Cap) in order to collect successively 12” section cores. In the lower marsh, where sediment is water saturated, such a device is inadequate. As soon as the core is retrieved, the hole is filled with water, disturbing the bottom sediment. Using outside liners in order to keep the sediment in place is not an option. Because that would mean to insert a core liner prior to sample the 2nd (and successive) core sections, which will double the disturbance effect of the sediment. However, the sludge core device is appropriate for coring in the upper marsh, in consolidated unsaturated soil. It is therefore indispensable to core in once a long section (at least 1 meter) in the lower marsh. Six times 2-cm top sediment were sampled in order to run FTR.

FTR sampling

FTR

Protected: GNOM Groundwater-derived Nutrient and Organic Matter: alteration during transit through coastal sediment

July 23rd, 2007

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