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GIS Modeling of Source Areas of Agricultural Nonpoint Source Pollution. James Zollweg, Ph.D. SUNY-Brockport Earth Sciences Water Resources Program. Overview. Nature/history of modeling work Philosophy of this approach Sand Point Gully study area Goals.

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gis modeling of source areas of agricultural nonpoint source pollution
GIS Modeling of Source Areas of Agricultural Nonpoint Source Pollution

James Zollweg, Ph.D.

SUNY-Brockport Earth Sciences

Water Resources Program

USDA Conesus Lake Project

overview
Overview
  • Nature/history of modeling work
  • Philosophy of this approach
  • Sand Point Gully study area
  • Goals

USDA Conesus Lake Project

runoff and soil moisture modeling with smr
Runoff and Soil Moisture Modeling with SMR
  • Variable Source Area Hydrology
  • Critical Source Areas for Nonpoint Source Pollution

USDA Conesus Lake Project

slide4

Runoff and Soil Moisture Modeling with SMR

  • SMR – The Soil Moisture Routing Model
  • GIS is the Ideal Environmental Modeling Platform
  • Spatially-distributed, Physically-based

USDA Conesus Lake Project

runoff and soil moisture modeling with smr1
Runoff and Soil Moisture Modeling with SMR

Private Function HM_NeighborFlow(sStorage As String, _

pInterflowRaster As IRaster, ierr As Integer) As Boolean

'-----------------------------------------------------------------------------

' The storage is adjusted for the amount leaving, the interflow and the amount

' entering from neighbor cells. The maps north, northeast, east, southeast,

' south, southwest, west and northwest represent the fraction of flow heading

' in 'that' direction from the current cell. Therefore to find the amount

' entering the current cell one needs to look at the neighbor cells and the

' corresponding maps which point to the current cell. For example, if the

' current cell is (i,j) and one looks to the north (i-1,j) one would use the

' south map to get the fraction of flow since the current cell is south of its

' north neighbor.

' ---------------------------------------------------------------

' | cell: (i-1, j-1) | cell: (i-1, j) | cell: (i-1, j+1) |

' | map: southeast | map: south | map: southwest |

' ---------------------------------------------------------------

' | cell: (i-1, j) | cell: (i, j) | cell: (i+1, j+1) |

' | map: east | map: none | map: west |

' ---------------------------------------------------------------

' | cell: (i+1, j-1) | cell: (i+1, j) | cell: (i+1, j+1) |

' | map: northeast | map: north | map: northwest |

' ---------------------------------------------------------------

(148 pages of code)

  • Coded and Running in Lennon Hall Using Visual BASIC within ArcGIS 8.2
  • Complete Control of Code
  • Easy to Integrate Additional Environmental Modeling Concepts

USDA Conesus Lake Project

slide7

Relationship Between Soil Test P and Dissolved P in Runoff

From: Daniel, et al. (1994)

USDA Conesus Lake Project

slide8

P LOSS - 4/25/92

UTM Easting

UTM Northing

USDA Conesus Lake Project

overview1
Overview
  • Nature/history of modeling work
  • Philosophy of this approach
  • Sand Point Gully study area
  • Goals

USDA Conesus Lake Project

slide10

Pertinent GIS features

  • preserves physical meaning throughout
  • allows internal validation
  • provides visualization of input data and model results
  • “integrates” point processes to watershed scale
  • flexible/modifiable/adaptable

USDA Conesus Lake Project

slide11

COMPUTER

MODELING

FIELD

STUDIES

USDA Conesus Lake Project

slide12

Regulatory agencies, Extension agencies, Farm managers

integrated

nutrient

management

Phosphorous

Transport

Nitrogen

Transport

SMR

Saturated

Areas

design

hydrology

Streamflow

Action agencies, Consulting engineers

USDA Conesus Lake Project

overview2
Overview
  • Nature/history of modeling work
  • Philosophy of this approach
  • Sand Point Gully study area
  • Goals

USDA Conesus Lake Project

slide19

Erosion Model (Rose, 1999)

USDA Conesus Lake Project

slide20

Erosion Model

Dietrich (1992)

Topographic Accumulation

Slope

USDA Conesus Lake Project

overview3
Overview
  • Nature/history of modeling work
  • Philosophy of this approach
  • Sand Point Gully study area
  • Goals

USDA Conesus Lake Project

slide22

Goals

  • Correctly model streamflow
    • Verify soil moisture distribution
    • 7 years worth of improvements and enhancements
  • Correctly model water quality characteristics
  • Soil erosion + sediment modules complete
  • Investigate use of QPF as a WQ management tool
  • Results in time for grant re-submission

USDA Conesus Lake Project