A Multi-Pollutant Modeling Framework for Carbon Management ...
Non-Point Source Pollutant Modeling
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Transcript of Non-Point Source Pollutant Modeling
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Non-Point Source Pollutant Modeling
Analysis and Prediction
David Munn
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Non-Point Source Pollution
Does not come from a single source Results from pollutants being washed out of
large areas during storms Difficult to model without use of GIS or
current NPSP models
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Goals
Predicting pollutant runoff loads Defining problem areas within the
Watershed Determine what factors effect pollutant
loading Determine streams with highest impact Pollutants considered:
BOD Suspended Solids
Total Phosphorous
Total Nitrogen
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Study Area
Brazos County Buffered boundary
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Process Overview
Gather data Data preparation
Reproject grids and shapefiles Clip themes and set analysis extents
Calculate curve numbers Delineate watersheds Calculate pollutant contribution Determine weighted accumulation Analyze data
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Data/ThemesDEM
TNRISSoil Classification
STATSGO County Boundaries
ESRI, Tiger filesLand Use/Land Cover
Txdata, Provided by Dr. Olivera
PrecipitationTxdata, Annual and Monthly
LULC Pollutant Contribution DataCornell University Hydraulics Study
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Reprojecting
Reprojected grids using ArcInfo-Workstation Reprojected geographic shapefiles using
CRWR-Vector Data Already in a Projection was reprojected
using ArcCatalog Final Projection: State Plane 1927
Central Texas, Zone 5376 Units = feet
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Delineating Watersheds
CRWR-Prepro Burned in Streams Filled Sinks Determined Flow
Direction Determined Flow
Accumulation Defined Streams Segmented Streams Defined Outlets Delineated Watersheds Vectorized Grids
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Curve Numbers
Used to determine runoff STATSGO data spatially documents soil
types (component makeup) Scripts provided by CVEN 689 Website
Soilgrp script – calculates % of hydrologic groups per soil type
cn script – creates curve numbers based on soil composition
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Run-off
Rainfall given per month (January)
Calculate Run-off (mm) using SCS method Map Calculator
combined formulas with rainfall and CN
Created new grid giving run-off depth per cell
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Pollutant Contributions
Q (mm)
Pollutant Concentration (mg/l)
Cell size (ft2)
= Mass (mg)
* Map Calculator
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Pollutant Flow/Accumulation
Weighted flow accumulation Executed in ArcInfo Assigns weights to cells based on a Grid
.5 1.0 2.0
1.0 .5 1.0
.75 1.5 1.5
.5 .5 1.0
1.0 .5 1.0
.75 1.0 .5
Weights Direction Accumulation
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Analysis
Determine what land-uses and soil types contribute the largest amount of pollutants
Determine what rivers suffer the greatest impact
Locate areas that contribute large masses of pollutants
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Land Use Relationships (Zonal Summaries)
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Soil Type Relationships(Zonal Summaries)
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Impacted Rivers
Method Map query Changed to shapefile
Results too dependent on general accumulation
More statistical work needed
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* BOD / SS* TP / TN
Areas of Concern
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Conclusions
Urban areas contributed the largest mass of BOD and suspended solids per unit area
Agricultural areas contributed the largest mass of Nitrogen and Phosphorous / area
Rivers > 700,000 cell accumulation were impacted Soil types differed in impact between pollutants
Nutrients:
Crocket-Luling-Benchley & Zack-Zulch-Booneville BOD and Suspended Solids
Zack-Zulch-Booneville
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Future Applications
Determining Pollutant Concentrations Calculate run-off volume using weighted
accumulation Sum run-off volumes with base flows Calculate in-stream concentrations
Better Statistical Analyis of Impacted Rivers
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Problems
REPROJECTING!!!!!!! Calculating pollutant contributions
(map calculator) Floating point analysis
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QUESTIONS
What up?