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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

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


Watershed Modeling

CONSTRAINTS:

SPACE & TIME

resolution


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


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


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)


  • 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


SWAT SETUP: CROP ROTATION

2006, Corn

2007, Soybean

2008, Corn

2009, Soybean


Change in DRP, lb/acre P2O5

Baseline to NoTill

Baseline to NoTill + Inc


Change in DRP, lb/acre P2O5

NoTill + In TO Disc Plowed + In

NoTill + Bcast TO NoTill + In


Change in Particulate P, lb/acre P2O5

Baseline to NoTill + In

Baseline to NoTill


Change in Particulate P, lb/acre P2O5

NoTill + BcastTO NoTill + In

NoTill + In TO Disc Plowed + In


THANK YOU!

http://www.heidelberg.edu/academiclife/distinctive/ncwqr

Rem Confesor

rconfeso@heidelberg.edu

419-448-2204