TABLE OF CONTENTS (tableof.pdf ... 105 kb)
LIST OF TABLES
LIST OF FIGURES
LIST OF PROCEDURES

1. INTRODUCTION (intro.pdf ... 23kb)

1.1 MOTIVATION
1.2 OBJECTIVES
1.3 SCOPE OF STUDY
1.4 PROJECT SUMMARY
1.5 CONTRIBUTIONS OF STUDY

2. LITERATURE REVIEW (litrev.pdf ... 46 kb)

2.1 LINKING GIS WITH WATER QUALITY MODELS
2.2 GIS MODELS OF WATER QUALITY
2.3 GIS AS A TOOL FOR SPATIAL DATA EXTRACTION
2.4 COMPARISON OF THE PROPOSED METHOD WITH PREVIOUS STUDIES

2.4.1 Time domain
2.4.2 Spatial domain
2.4.3 Model formulation

3. DATA AND COMPUTER SOFTWARE DESCRIPTION (data.pdf ... 2,399 kb)

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
3.1.6 Maps of mean annual precipitation and temperature

3.2 COMPUTER SOFTWARE DESCRIPTION

3.2.1 GIS software
3.2.2 Statistical software

4. METHODOLOGY (methodo.pdf ... 3,504 kb)

4.1 REPRESENTATIVE AGRICULTURAL CHEMICALS

4.1.1 Nitrate
4.1.2 Atrazine

4.2 SELECTION OF ANALYSIS REGION AND MAP COORDINATE SYSTEM
4.3 MATHEMATICAL DESCRIPTION

4.3.1 Overview of transport equations
4.3.2 GIS and cascade modeling.
4.3.3 Regression equation development
4.3.4 Agrichemical runoff from the field
4.3.5 Transport in rivers
4.3.6 Seasonal variations
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 Subdivision of study region into modeling units
4.4.2 Unit watershed flow system
4.4.3 Ordering system of the modeling units
4.4.4 Enhancement of the stream delineation process

4.5 REDISTRIBUTION OF THE FLOW RECORD OVER UNGAUGED 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
4.5.4 Example of flow redistribution.

4.6 EXPONENTIAL DECAY MODEL

4.6.1 Exponential decay model overview
4.6.2 Travel time approximation

5. PROCEDURES (procedu.pdf ... 1,332 kb)

5.1 CONCENTRATION AND FLOW MEASUREMENTS
5.2 PREPARING DATA FOR MODEL PARAMETER 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
5.2.7 Annual temperature and annual precipitation depth

5.3 PREPARING DATA FOR STATISTICAL ANALYSIS

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 “Flwprc”
5.5.5 Project “Tools”

6. RESULTS (results.pdf ... 1,095 kb)

6.1 SEASONAL VARIATION OF AGRICHEMICALS IN THE MIDWEST STREAMS

6.1.1 Seasonal variation of the atrazine concentration
6.1.2 Seasonal variation of the nitrate plus nitrite as nitrogen concentration

6.2 AVERAGE ANNUAL AGRICHEMICAL CONCENTRATION IN THE MIDWEST STREAMS

6.2.1 Average annual atrazine concentration in the Midwest rivers
6.2.2 Average annual nitrate plus nitrite as nitrogen concentration

6.3 ERROR OF MODEL PREDICTIONS
6.4 COMPARISON OF PREDICTED FLOW WITH OBSERVED ONE
6.5 AGRICHEMICAL CONCENTRATIONS IN THE CEDAR RIVER BASIN

7. SUMMARY, CONCLUSIONS, AND RECOMMENDATIONS (conclus.pdf ... 28 kb)

APPENDICES (appendi.pdf ... 208 kb)

APPENDIX A C-CODES

A1 Program newnx.c--reconstructing the flow connectivity between modeling units after some of units have been removed
A2 Program fdy4.c--calculating the flow rate in ungauged streams from the available record

APPENDIX B AVENUE SCRIPTS

B1 Changing ArcView projects from the PushButton Bar.
B2 Scripts from the project “model”
B3 Scripts from the project “results”
B4 Scripts from the project “flwprc”
B5 Scripts from the project “tools”

APPENDIX C ARC/INFO MACROS--AMLS

C1 WSHGS.AML
C2 NEXTWSH.AML
C3 RAININFO.AML
C4 RAINMAP.AML
C5 RAINM2.AML
C6 SELDATA.AML
C7 FD4Y.AML
C8 SLOPE3.AML
C9 DEMALB.AML

BIBLIOGRAPHY (bibliog.pdf ... 53kb)

VITA (vita.pdf ... 6 kb)