- 1.
- Introduction
- 1.1
- Motivation
- 1.2
- Objectives
- 1.3
- Scope of study
- 1.4
- Project summary
- 1.5
- Contributions
- 2.
- Literature Review
- 2.1
- GIS - water quality linked models
- 2.2
- GIS models of the water quality
- 2.3
- GIS as a tool for spatial data extraction
- 2.4
- Comparison of proposed method with previos studies
- 2.4.1
- Time domain
- 2.4.2
- Spatial domain
- 2.4.3
- Model formulation
- 3.
-
Data and Computer Software
- 3.1
- Data sources
- 3.1.1
- Herbicide and nutrient data
- 3.1.2
- Digital terrain representation
- 3.1.3
- Reach File 1
- 3.1.4
- Atrazine and nitrogen fertilizer use
- 3.1.5
- Hydrologic and climatic data
- 3.2
- Computer software
- 3.2.1
- GIS software
- 3.2.2
- Statistical software
- 4.
-
Methodology
- 4.1
- Representative agricultural chemicals
- 4.1.1
- Nitrate
- 4.1.2
- Atrazine
- 4.2
- Selection of analysis region
- 4.3
- Mathematical description
- 4.3.1
- Overview if transport equations
- 4.3.2
- Regression equation development
- 4.3.3
- Agrichemical runoff from field
- 4.3.4
- Transport in rivers
- 4.3.5
- Seasonal variations
- 4.3.6
- Exemplary equations for chemical concentration and load
- 4.3.7
- Extracting values of explanatory variables for the regression analysis
- 4.3.8
- Application of the regression models
- 4.4
- GIS model description
- 4.4.1
- GIS and cascade modeling
- 4.4.2
- Subdivision of study region into modeling units
- 4.4.3
- Unit watershed flow system
- 4.4.4
- Ordering system of the modeling units
- 4.4.5
- Enhancement of the stream delineation process
- 4.5
- Redistribution of the flow record over ungaged rivers
- 4.5.1
- GIS database of monthly flow rate and the precipitation depth
- 4.5.2
- Average precipitation depth in modeling units
- 4.5.3
- Mathematical description
- 4.6
- Exponential decay model
- 4.6.1
- Exponential decay model overview
- 4.6.2
- Travel time approximation
- 5.
-
Procedures
- 5.1
- Concentrations and flow measurements
- 5.2
- Preparing data for model parameters estimation
- 5.2.1
- Preparing 500 m (15'') DEM for analysis
- 5.2.2
- Estimation of watershed parameters
- 5.2.3
- Creating grid of sampling sites
- 5.2.4
- Adjusting location of sampling sites
- 5.2.5
- Extracting parameters of the sampled site watersheds
- 5.2.6
- Agrichemical application
- 5.3
- Model selection
- 5.4
- Agrichemical concentrations in the Iowa-Cedar River basin
- 5.4.1
- Creating a map of the flow direction
- 5.4.2
- Map of the modeling unit outlets
- 5.4.3
- Watershed connectivity
- 5.4.4
- Refining modeling units
- 5.4.5
- Database of monthly precipitation depth and monthly flow rate
- 5.4.6
- Average precipitation depth in modeling units
- 5.4.7
- Spatial distribution of flow
- 5.4.8
- Determining input values for the Iowa-Cedar River model
- 5.5
- ArcView model of agrichemical transport
- 5.5.1
- Model overview
- 5.5.2
- Project "Model"
- 5.5.3
- Project "Results"
- 5.5.4
- Project "Flprc"
- 5.5.5
- Project "Tools"
- 6.
- Results
- 7.
- Conclusions
-
-
REFERENCES
-
- APPENDIX
- A
- C-codes
- B
- Avenue scripts
- C
- Arc/Info macros--AMLs
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April 27,