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Flux through Peat

Flux through Peat. An investigation into fluid flow in the Serpentine Bog, Belgrade Lakes Watershed, Maine. Belgrade Lakes. A – Maine B – Belgrade Lakes Watershed C – Surficial Geology D – Bedrock Geology. Site Description. Serpentine Bog. Corridor. Cross Section. Hydraulic Head.

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Flux through Peat

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  1. Flux through Peat An investigation into fluid flow in the Serpentine Bog, Belgrade Lakes Watershed, Maine

  2. BelgradeLakes • A – Maine • B – Belgrade Lakes Watershed • C – Surficial Geology • D – Bedrock Geology

  3. Site Description Serpentine Bog Corridor

  4. Cross Section

  5. Hydraulic Head

  6. Darcy’s Law Discharge (Q) Cross-sectional area (A) Hydraulic gradient (dh/dl) Constant (K)

  7. Hydraulic HeadandWeather Data Northern Transect Southern Transect Serpentine Datalogger Weather

  8. Slug Tests Northern Transect Southern Transect Serpentine Datalogger

  9. Numerical Modeling Why? (1) Test hypotheses about groundwater flow through a system (2) Predict how the system would respond to different conditions How? (1) Finite Difference Grid (2) Properties and Boundaries (3) Calibration (4) Additional Models Column Row Layer

  10. Hydraulic Properties Cross Section Slug Tests Layer 1 Row 17

  11. Boundaries

  12. Base Model Results Groundwater Map (Layer 1) Velocity Map (Layer 1) Surface Water Head = 9.71 m Recharge = 1347 mm/year Velocity Map (Row 3)

  13. Calibration

  14. Runs 1 & 2 Surface Water Head = 9.71 m Recharge = -86 mm/year Surface Water Head = 9.71 m Recharge = 2353 mm/year Groundwater Map Layer 1 Velocity Row 3 Velocity

  15. Runs 3 & 4 Surface Water Head = 10.02 m Recharge = 1347 mm/year Surface Water Head = 9.58 m Recharge = 1347 mm/year Groundwater Map Layer 1 Velocity Row 3 Velocity

  16. Conclusions • Geometry • K = 3.49*10-6 cm/s to ~2.36*10-4 cm/s • General ideas on fluid flux • Effect of water table and precipitation on system • Temporal changes > spatial changes • How much faith should be placed in any numerical model?

  17. Acknowledgements • Dr. Jennifer Shosa • Dr. Bruce Rueger, Dr. Robert Gastaldo and Alice Ridky • Dr. Whitney King • Katie Curtis and Dan Pace • Jerry and Betsy Tipper • East Pond Association • ACS-PRF Grant # 40810-GB8

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