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Watershed Modeling for Lake Erie: Phosphorus Reduction Strategies

Explore a practical approach to reduce dissolved phosphorus loading into Lake Erie through a novel soil test metric and modeling critical areas. This study, presented by Research Scientist Rem Confesor Jr., focuses on targeting strategies to protect the Great Lakes. Constraints such as space and time resolution are addressed in the simplistic conceptual model, with a need for further calibration due to unknown coefficients. The study introduces the hydrologic response unit (HRU) as a basic spatial unit and highlights the SWAT model's benefits for simulating the effects of agricultural management changes on runoff flow and nutrient transport. Discover how crop rotation and tillage practices impact phosphorus levels in the watershed. For more information, visit http://www.heidelberg.edu/academiclife/distinctive/ncwqr or contact Rem Confesor at rconfeso@heidelberg.edu, 419-448-2204.

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Watershed Modeling for Lake Erie: Phosphorus Reduction 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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