Customized Sampling Methods and Devices for Challenging Estuary Sampling Programs Scott R. Compston David W. Himmelheber, Ph.D Susan K. Hill, P.E. Peter.

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Presentation transcript:

Customized Sampling Methods and Devices for Challenging Estuary Sampling Programs Scott R. Compston David W. Himmelheber, Ph.D Susan K. Hill, P.E. Peter J. de Haven, P.E. Peter P. Brussock, Ph.D

Site Setting  Tidal Estuary  Extensive system of primary waterway, tributaries, and marshes  Limitations and Opportunities provided by…  Shallow water  Tides  Dense Phragmites marshes

High Resolution Sampling of Waterway Sediment  Core depth = 2 meters.  Subsampling on 2 centimeter intervals.  Planned analyses required large sample mass.  High moisture content.  High organic content.  Standard 4-inch Vibracoring would require excessive compositing of multiple cores and significant labor to process.  Increase the diameter of the core without extensive cost implications.  Design around limitations and opportunities provided by the site. Sampling Program Complication Solution

Custom Vibracore Adapter & Polycarbonate Barrel Custom adapter fits 4” Vibracore head to 8” core liner 4-inch pipe In-pipe test plug Vacuum fitting Screw plate Polycarbonate liner

High Resolution Sampling – Vibracoring Water Sediment

8-Inch Coring Method  Polycarbonate barrel inserted to desired depth.  Suction abatement tube cleared.  Passive or active suction abatement.  Vacuum applied in headspace.  Core lifted to deck of sampling vessel.  Core cut in half and sealed for transport.

 8-inch core transported and processed vertically.  1/8th-inch thick sleeve scored with circular saw.  Top of core covered during processing.  Adjustable rubber guide used to ensure straight cuts. 8-Inch Core Processing

Adjustable saw deck guide Scored polycarbonate barrel

8-Inch Core Processing  Intervals are removed using stainless steel plate pushed through scored barrel.  600 to 1,000+ grams per section.

High Resolution Sampling – Box Coring  Box coring is a excellent method for quickly collecting high quality shallow cores at this site.  Box coring does not facilitate subsampling.  Box core insert sleeve. Complication Solution

Box Core Insert Two-piece stainless insert sleeve

Core Recovery Stainless insert sleeve and “side cheeks” inserted through top opening after box coring. Cap inserted beneath insert sleeve and secured. Sleeve contains undisturbed 30 to 40 cm sediment column.

Box Core Processing 2cm  Sectioned by sliding one side vertically to expose desired interval and removing with stainless plate.

Design Considerations  Design holds two independent sections together during processing.  Promotes level sectioning (2 flat sides as a guide).  Simple and inexpensive.

High Resolution Sampling – Marsh Sediment  Similar sampling goals to waterway sampling, (large sample volume, 2 to 3 cm intervals).  Access to locations  Phragmites  Extremely dense root mat resistant to precise coring and sectioning.  Roots and water can be a significant percentage of recovery.  Custom marsh box core sampler designed for Phragmites marsh. Complications Solution Sampling Program

Marsh Box Core Design  Dual channel design  Sample sectioning guides Cap Base

Marsh Box Core Process Guillotine  Box core advanced to refusal.  “Guillotine” cuts roots on all sides in advance of box core.  Access holes dug beside core.  Core lifted out from the bottom

Marsh Box Core Process Sectioning Intervals

Marsh Sediment Processing Intact core sectioned cleanly on desired intervals.

Marsh Sediment Processing 1cm Interval Extensive Root Mat

Method Comparison 50 cm marsh box core 60 cm Vibracore

Questions?