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Modeling of Critical Areas for DRP Runoff and Targeting Strategies

Modeling of Critical Areas for DRP Runoff and Targeting Strategies . Rem Confesor Jr. Research Scientist NCWQR, Heidelberg University Team Meeting # 5 Great Lakes Protection Fund Grant A Phosphorus Soil Test Metric To Reduce Dissolved Phosphorus Loading to Lake Erie July 24 , 2013.

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Modeling of Critical Areas for DRP Runoff and Targeting Strategies

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  1. Modeling of Critical Areas for DRP Runoff and Targeting Strategies Rem ConfesorJr. Research Scientist NCWQR, Heidelberg University Team Meeting #5 Great Lakes Protection Fund Grant A Phosphorus Soil Test Metric To Reduce Dissolved Phosphorus Loading to Lake Erie July 24, 2013

  2. Watershed Modeling CONSTRAINTS: SPACE & TIME resolution

  3. A very simple conceptual model… Issues: One precipitation value for the whole watershed. Model is not a good representation of reality. Coefficients are unknown: need for calibration. Spatially lumped across the whole watershed, Yearly time step Precipitation Runoff flow Infiltration Yearly Runoff flow = (x)Precipitation + y(Infiltration) + Constant

  4. A little bit of improvement… Precipitation (P) Basic spatial unit Evapo- transpiration (ET) Evaporation (E) Soil storage (S) Runoff Flow (R) Infiltration (I) Lateral subsurface Flow (L) Groundwater recharge (G) S = P - ET - E - I - R; I = G + L; Discharge (Q) = (a)R + (b)L + c

  5. The hydrologic response unit (HRU)- basic spatial unit: unique combination of slope, landuse, & soil. Digital elevation model (slope/terrain) + + Land use/ crop cover Soil type Hydrologic Response Units (HRUs)

  6. The SWAT Model: • Physically-based. • Daily time step. • Long-term simulation of effects of changes in ag. management. • “RELATIVE” output changes due to these management changes. Soil Terrain Weather Flow, sediment, nutrients (N & P), etc. Agricultural practices & mgt.: tillage, fertilizer, etc. Land use/ crop cover

  7. SWAT SETUP: CROP ROTATION 2006, Corn 2007, Soybean 2008, Corn 2009, Soybean

  8. Change in DRP, lb/acre P2O5 Baseline to NoTill Baseline to NoTill + Inc

  9. Change in DRP, lb/acre P2O5 NoTill + In TO Disc Plowed + In NoTill + Bcast TO NoTill + In

  10. Change in Particulate P, lb/acre P2O5 Baseline to NoTill + In Baseline to NoTill

  11. Change in Particulate P, lb/acre P2O5 NoTill + BcastTO NoTill + In NoTill + In TO Disc Plowed + In

  12. THANK YOU! http://www.heidelberg.edu/academiclife/distinctive/ncwqr Rem Confesor rconfeso@heidelberg.edu 419-448-2204

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