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Applications of Integrated Surface Water Groundwater Modelling Techniques and Perspectives

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Applications of Integrated Surface Water Groundwater Modelling Techniques and Perspectives

  1. 1. Applications of Integrated Surface Water/Groundwater Modelling Techniques and Perspectives P.J. Thompson, M.A. Marchildon, E.J. Wexler, J.D.C. Kassenaar Earthfx Incorporated GeoMontréal 2013 October 2, 2013
  2. 2. Introduction …demonstrate that integrated modelling is a practical solution to complex water management problems… Case Studies: 1. Large Scale Urban Development 2. Assessment of Municipal Well System in contact with nearby surface water features 3. Eco-hydrology study of linkages between groundwater recharge and significant surface water features
  3. 3. Ground water and Surface-water FLOW GSFLOW: • Released in 2008 • Free and open source • Modular • Fully distributed • Based on the USGS PRMS and MODFLOW (Markstrom et.al., 2008)
  4. 4. GSFLOW Submodels Hydrology (PRMS) GW (MODFLOW-NWT) Hydraulics (SFR2)
  5. 5. GSFLOW: Multi-Resolution Climate variables 10:1 Surface hydrology 1:1 Sub-surface 5:1 hydrogeology Stream networks Treated as linear segments independent of grid resolution ( 5 - 200m ) ( 10 - 50m ) ( 2 - 4 km )
  6. 6. NEXRAD (U.S. Based Doppler Weather Radar) Click for Animation Environment Canada (AES) Rain Gauges NEXRAD (Buffalo, NY)
  7. 7. GSFLOW: High Resolution Land Use Land Use Class Assigned to 20-m Grid % Impervious Based on Land Use Class
  8. 8. GSFLOW: Cascade flowpaths • 5m LIDAR digital elevation model down-scaled to a 10m DEM • Flowpaths defined using an 8-directional, steepest decent algorithm
  9. 9. GSFLOW: Cascade flowpaths • Runoff generated from one grid cell can infiltrate in an adjacent cell (i.e., Run-on) • Infiltration into the soil zone of one cell is routed to an adjacent cell (interflow) and can emerge as surface runoff (exfiltration) • Timing is treated explicitly • Assumption: water runs downhill
  10. 10. GSFLOW: Cascade flowpaths Q Q “Nash (1957) cascade”
  11. 11. GSFLOW: Streamflow • GSFLOW outputs total streamflow as opposed to cumulative baseflow • Water budget calculated for each stream cell, reach, pond and lake Click for Animation
  12. 12. GSFLOW: Calibration Transient Groundwater Calibration to Monitors Transient Surface Water Calibration to Stream Flow Gauges
  13. 13. Case Study 1: Large Scale Urban Development • Large urban development in Central Florida • 1100 km2 Area • Model centered on wetland complex over karst Caloosahatchee River Telegraph Swamp Proposed Site
  14. 14. Case Study 1: Large Scale Urban Development • Complex stormwater management plan • Compare Current and Post-development conditions • Analyze changes to groundwater recharge, runoff, and wetland hydroperiod • Demonstrate that the storm water management system will restore more “natural” conditions Proposed Site Plan
  15. 15. Case Study 1: Large Scale Urban Development • Transient Model Results • Current conditions • Precipitation • Groundwater heads • Streamflow • Lake & Wetland Stage Click for Animation
  16. 16. Case Study 1: Large Scale Urban Development • Simulated Wetland Hydroperiod • Current conditions • Range between 0-365 days • Magenta areas are wet 365 days
  17. 17. Case Study 1: Large Scale Urban Development • Natural stream network • No ditching • Pre-Columbian vegetation and land use estimated from historical mapping and photography
  18. 18. Case Study 1: Large Scale Urban Development • Simulated Change in Infiltration • Natural to Current Conditions • (decrease/ increase)
  19. 19. Case Study 1: Large Scale Urban Development Current Simulated Hydroperiods Post-Development Simulated Hydroperiods
  20. 20. Case Study 1: Large Scale Urban Development Natural, Post-development, and Current Conditions• Wetland Stage
  21. 21. Case Study 2: Wellfield Interactions with SW • Study conducted for Conservation Halton • Municipal well field supplies Milton, Ontario, Canada’s fastest growing city • Complex reservoir operations • Several large quarries above the escarpment
  22. 22. Case Study 2: Wellfield Interactions with SW • Groundwater model layers follow stratigraphy • Layers adjusted to preserve continuity Wellfields
  23. 23. Case Study 2: Wellfield Interactions with SW • Runoff directed to lakes and streams, flow routed down stream network • Groundwater leaks in/out of lake cell and stream segment depending on stage and aquifer head • Total streamflow is simulated
  24. 24. Case Study 2: Wellfield Interactions with SW OBSERVED PREDICTED Simulated Stage in Reservoirs Kelso Lake Hilton Falls Kelso Reservoir Control Structure (Hatch, 2007)
  25. 25. Case Study 2: Wellfield Interactions with SW • Had difficulty matching seasonality in the wellfield • Required two-stage lake leakage: Enhanced leakage around shoreline when filled • Lower lake bottom leakage is reduced by silts and fine sediments Upper Lake: Summer high stage Lower lake: Winter holding level Lake Leakage Out Lake Leakage In
  26. 26. Case Study 2: Wellfield Interactions with SW OBSERVED PREDICTEDCampbellville – MW2/05B Kelso TW3/67 Kelso TW4/67 Shows influence of high leakage from lake at summer stageHeads in Wellfield Monitors
  27. 27. Case Study 3: Ecohydrology Recharge Assessment • Study conducted for Lake Simcoe Region Conservation Authority • Detailed assessment of the linkages between recharge and significant surface water features • Drought assessment • Model includes all 1st Order Streams • 85 Lakes, Ponds, and Lake/Wetlands
  28. 28. Case Study 3: Ecohydrology Recharge Assessment Backward Particle Tracking from Features of Interest to Areas of Recharge See Marchildon et al. in the proceedings for a more detail discussion Stream: Orange pathlines Wetland: Green pathlines
  29. 29. In Summary • Integrated modelling is rapidly becoming an accepted strategy to assess complex challenging problems • Integrated models can assess practical problems • GSFLOW represents a practical, scalable tool, capable of solving real-world engineering problems • Demonstrated application in multidisciplinary projects Thanks to:
  30. 30. Questions? Click for Animation Simulated heads and lake stage at Kelso Reservoir Dry year (2007) and wet year (2008)

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