Modeling of Critical Areas for DRP Runoff and Targeting Strategies

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Presentation transcript:

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 1

Watershed Modeling CONSTRAINTS: SPACE & TIME resolution 2

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 3

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 4

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) 5

The SWAT Model: Physically-based. Daily time step. Terrain Weather Soil Land use/ crop cover Agricultural practices & mgt.: tillage, fertilizer, etc. Flow, sediment, nutrients (N & P), etc. 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. 6

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

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

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

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

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

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