Introduction to WASP7 Eutrophication Module Overview of Variables and

Introduction to WASP7 Eutrophication Module Overview of Variables and Processes Implemented in WASP7 Eutrophication Module

Watershed & Water Quality Modeling Technical Support Center Good Reference Materials Rates, Constants, and Kinetics – http://www.epa.gov/ORD/WebPubs/surfaceH2O/surface. html Steve Chapra – Surface Water Quality Modeling James Martin – Hydrodynamics and Transport for Water Quality Modeling Thomann and Mueller – Principles of Surface Water: Quality Modeling and Control

Watershed & Water Quality Modeling Technical Support Center WASP7 State Variables Ammonia Nitrate Phytoplankton Periphyton Orthophosphate Particulate Detritus Dissolved Oxygen Salinity – Carbon – Nitrogen – Phosphorus Dissolved Organic Matter – – – – – CBOD (1) CBOD (2) CBOD (3) DON DOP

Watershed & Water Quality Modeling Technical Support Center Eutrophication Diagram

Watershed & Water Quality Modeling Technical Support Center Processes Considered Phytoplankton Kinetics Periphyton Kinetics Phosphorus Cycling Nitrogen Cycling Dissolved Oxygen Balance Sediment Diagenesis

Watershed & Water Quality Modeling Technical Support Center Levels of Complexity in Implementing WASP7 Eutrophication Model Level of Complexity Name Ammonia Nitrate Inorganic Phosphorus Phytoplankton Carbon Periphyton Carbon Carbonaceous BOD Dissolved Oxygen Organic Nitrogen Organic Phosphorus Sediment Diagenesis Level 1 2 3 4 5 6 1 x x 2 3 4 5 6 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x Description Streeter-Phelps DO/BOD and Descriptive SOD Modified Streeter-Phelps with NBOD Linear DO Balance with Nitrification Simple Eutrophication with Descriptive SOD Intermediate Eutrophication with Sediment Diagenesis Advanced Eutrophication with Sediment Diagenesis and Periphyton