Download - Monitoring Saturated and Un-saturated Zone Processes for Improving Integrated Modeling

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  • Monitoring Saturated and Un-saturated Zone Processes for Improving Integrated Modeling

    Patrick Tara, Jeff Vomacka, Mark RossCenter for Hydrologic Modeling and Aquatic Systems

    Jeff Geurink, Ron Basso

  • Why Collect Data?Determine Water Budget TermsET budget?Vadose zone ETGroundwater ETSurface water runoff?Infiltration excessSaturation excessBaseflow flux?Surface water storage releaseGroundwater storage release

  • Why Collect Data?Answer Fundamental Groundwater upward flux (capillary fringe)?Vadose zone or water table recharge?Variable specific yield?Air entrapment

  • Site LocationHillsborough CountyReservoir Site LocationF L O R I D AReservoir Site Location

  • Instrument Locations

  • Installed InstrumentationWeatherRainfallContinuous tipping bucket rain gages (3 gages)Standard NWS manual rain gages (3 gages)Pan evaporationWind speed / wind directionTemperature / humidity / solar radiation

  • Installed Instrumentation HydrologicStreamflow (5 installations)Complex V-notched weirsContinuous stage recordersWellsContinuously recorded (12 gages)Weekly manually recorded (83 wells)Runoff test-bed (1 installed, 1 in progress)Continuous soil moisture probes (6 installations)

  • Streamflow Monitoring

  • Streamflow Analysis

  • Well Transects

  • Well Transect Data

  • Runoff Test-bedSize 100ft x 20ft (30.5m x 6.1m)Flashed to prevent inflows/outflowsGutter captures runoffWeir with continuously logged precision level gage allows accurate flow measurementRain gageWellsSoil moisture probes

  • Runoff Test-bedATION in Feet

  • Runoff Test-bed SchematicMonitoring wellsSoil moisture probesWeir10020Perimeter FlashingGutterOverland Flow

  • Runoff Test-bed Flow MeasurementCross-section of runoff gutter which captures the overland flow and discharges to a weir in order to measure flowOverland FlowV-Notched Weir plateDischarge to Land Surface via conduit

  • Runoff Test-bed Photographs

  • Runoff Test-bed DataJune 25-26, 2002

  • Soil MoistureFrequency domainContinuously monitors wetting as well as dryingCaptures upward fluxCaptures air entrapmentTypical probe includes 8 transducers spaced at 10, 20, 30, 40, 50, 70, 100, 150cm below land surface

  • Soil Moisture Probes Installation Photographs

  • Soil Moisture Probes Photographs

  • Geo-probe Soil Sampling

  • Soil Texture Analysis

  • Soil Moisture Profiles

  • Soil Moisture Profiles

  • Variable Specific Yield

  • Preliminary ResultsAir entrapment is an important processEvent pressurizationProlonged encapsulationSpecific yield is not constant (shallow water table)Small ET and recharge fluxes result in significant water table fluctuationsSaturation excess is dominate runoff processMaybe controlled by air entrapment?Vadose zone moisture deficit controls rechargeRainfall intensity effects all above processes

  • Soil Moisture Profiles


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