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Scenarios and Model Describing Fate and Transport of Pesticides in Surface Water for Danish Conditions

Contents

Preface

Sammenfatning og konklusioner

Summary and conclusions

1 Choice of Scenario Description

• 1.1 Process considerations
  • 1.1.1 Spray drift
  • 1.1.2 Wet and Dry Deposition
  • 1.1.3 Deposition onto the Soil Surface and Plants
  • 1.1.4 Dissolved in Surface Runoff or Transported with Soil Erosion
  • 1.1.5 Unsaturated zone
  • 1.1.6 Groundwater
  • 1.1.7 Pesticide dissolved in drain flow
  • 1.1.8 Colloid-bound Pesticide in Drain Flow
  • 1.1.9 Overview of Pathways
  • 1.1.10 Measurements in Streams
  • 1.1.11 Measurements in Ponds
• 1.2 Considerations of Scale

2 Selection of "Representative" Areas

• 2.1 Soil types and hydrology
• 2.2 Overall Land Use
• 2.3 Hydrology of water bodies
• 2.4 Climate
• 2.5 Changes discovered during project implementation

3 Changes from Calibrated Catchments to Scenarios

• 3.1 Lillebæk stream
• 3.2 Odder bæk
• 3.3 The pond scenarios
  • 3.3.1 Geomorphology
  • 3.3.2 Pond Type around Odder Bæk
  • 3.3.3 Pond Type around Lillebæk
  • 3.3.4 Conclusions regarding types of ponds
  • 3.3.5 Dimensions of the Ponds
  • 3.3.6 Biological structure of the pond
  • 3.3.7 Implementation of the pond in the Lillebæk model setup
  • 3.3.8 Implementation of the pond in the Odder Bæk model setup

4 Parameterisation of Sub-components

• 4.1 Growth curves and deposition on soils
• 4.2 Wind drift
• 4.3 Dry deposition
• 4.4 Calculation of effective pesticide dose on the soil
• 4.5 Adsorption to macrophytes
• 4.6 Adsorption to suspended matter
• 4.7 Sediment in streams and ponds

5 General Conditions for the Simulations

• 5.1 Simulation Period
• 5.2 Time Steps of the Simulations
• 5.3 Initial Conditions

6 Mass Balances of Scenarios

• 6.1 Water balances
• 6.2 Solute balance examples

7 Uncertainty Issues in Relation to the Scenarios

• 7.1 Introduction
• 7.2 Uncertainties related to model choice and model parameterisation
  • 7.2.1 Colloid transport and macropore representation
  • 7.2.2 Dispersion in the upper part of the groundwater
  • 7.2.3 Effect of storage frequency
  • 7.2.4 Process kinetics
  • 7.2.5 Description of degradation in soil
  • 7.2.6 Diffusion and stratification in ponds
• 7.3 Uncertainties related to the choice of scenarios
• 7.4 Uncertainties related to input
• 7.5 Uncertainties related to the interpretation of output
• 7.6 Strategies to further reduce the uncertainty

8 Uncertainty Analysis of the Registration Model

• 8.1 General systematic in uncertainty analysis
• 8.2 Principle of the uncertainty analysis - intelligent Monte Carlo
• 8.3 Uncertainty on the quantification of the variance
• 8.4 Implementation in to the user interface

9 Conclusions Concerning the Appropriateness of the Model Tool for Evaluation of the Fate and Transport of new Pesticides to Surface Water in Connection with the Registration Procedure

10 References

Appendix A: Description of Soil Types in the Test Catchments at the Time of Selection

Appendix B: Growth Curves

Appendix C: Wind Drift

Appendix D: Uncertainty Analysis of the Registration Model

Appendix E: Monthly water balances for the scenarios

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Version 1.0 Maj 2004, © Danish Environmental Protection Agency