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Modeling cumulative impacts of the loss of headwater streams on ecosystem metabolism

Modeling cumulative impacts of the loss of headwater streams on ecosystem metabolism. Denis Newbold and Lou Kaplan Stroud Water Research Center Peter Claggett Canaan Valley Institute.

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Modeling cumulative impacts of the loss of headwater streams on ecosystem metabolism

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  1. Modeling cumulative impacts of the loss of headwater streams on ecosystem metabolism Denis Newbold and Lou Kaplan Stroud Water Research Center Peter Claggett Canaan Valley Institute

  2. What would removing first and second order streams from a watershed do to the metabolism in third and larger-order streams? • Focus on the production, downstream transport, and utilization of Biodegradable Dissolved Organic Carbon (BDOC)

  3. Origin Destination Organic Carbon Turnover Length SC Leaf Detritus CO2 CO2 Organic Carbon VC Streambed algae

  4. v f Dissolved Organic Carbon Water Velocity X Depth Turnover Length = Uptake Velocity S d v w

  5. v f Dissolved Organic Carbon Water Velocity X Depth Turnover Length = Uptake Velocity S d v w

  6. TWENTY-MILE CREEK WATERSHED

  7. Advection-dispersion equation for BDOC dynamics in a segment L = BDOC per unit length (g/m) D = Longitudinal dispersion (m2/s) vwat = Water velocity (m/s) I = BDOC generation per unit length (g/m/s) vf = Uptake velocity for BDOC (m/s) d = Depth of water (m)

  8. Outputs from each link are routed downstream through the network Second-order stream reach (vw1L1+ vw2L2) e -kx + I (1 – e-kx) vw3vwk L3(x) = First-order tributary #1 First-order tributary #2 L1(x) =I (1 – e-kx) vwk L2(x) =I (1 – e-kx) vwk

  9. Uptake velocity for BDOC UPTAKE VELOCITY(m/s) Glucose stream additions (PA, NY) 5.0 x 10-5 13C-labeled leachate stream additions (PA) 1.8 x 10-5 13C-labeled leachate (intermediate lability) mesocosm studies 1.0 X 10-6

  10. TWENTY-MILE CREEK WATERSHED 10 km FIFTH-ORDER West Virginia

  11. REFRACTORY INTERMEDIATE LABILE DOCGeneration DOCUtilization

  12. Modeled BDOC in undisturbed drainage network 0.6 0.5 0.4 BDOC (mg/L) 0.3 0.2 BDOC after removing 1st and 2nd order tribs 0.1 = m/s v 5.0E-06 Intermediate Lability : f 0.0 0 1 2 3 4 5 6 Stream Order

  13. Clean Stream Water ~500,000 organic particles

  14. Particle migration velocity: 150 m/day Time to resuspension: 5.1 days Transport Distance 750 m

  15. USGS SPARROWMODEL R B Alexander et al. 2000 Nature

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