an introduction to water quality models

A model is more like a

Than a

-Dominic Di Toro

Lakes , reservoirs and ponds , rivers and streams & estuaries

Sediments

Organic loadings &

toxic chemicals

Nutrients & temprature

nutrients, organic loadings, sediments, toxic chemicals,

and temperature

stressors

algal, macrophyte, invertebrate

, and fishs

victims

CORMIX3

CORMIX2

CORMIX1

Submerged Single

Port Discharges

Plume

Characteristics of

Submerged Multiport

discharges

Buoyant Surface

Discharges

The time varying

processes of advection

point and diffuse mass

loading

Disper-sion

boundaryexchange

Eutro.

Heat

MercuryOrganic

Toxicants

Simple Toxicants

Water ResourcesData Base

Spatial Grid

x/y Plots

Post Process.

WASPInput

BMD

Eutrophication

Conservative

Toxicant

MOVEM

Stored

DataHydro

Model Preprocessor/Data Server

Mercury

Binary Model Output

Graphical Post Processor

ModelsHydrodynamicInterface

CSV, ASCII Output

Organic

Toxicants

Heat

Binary Wasp Input File (wif)

• Network Flexibility

• Most Water Quality Problems

• Separation of Processes

• External Links to Models and Spreadsheets

• Two Solution Techniques

• Does not handle some variables and processes:– Mixing zone processes

– Non aqueous phase liquids (e.g., oil spills)

– Segment drying (mudflats, flood plains)

– Metals speciation reactions (special module, META4, not part of general WASP release)

• Potentially large external hydrodynamic files

• Separate eutrophication and toxicant fate modules

• Cannot readily be run in batch mode

Conventional Polutants (N, P, Dissolved

O, BOD, SOD, Algae)

Ph

Periphyton

Pathogens

REFERENCES

U.S Environnemental Protection Agency (EPA.gov)

AQUATOX fact sheet

CORMIX user manual

WASP7 spread sheet

Qual2K user manual

Environmental Laboratory of U.S Army(el.erdc.usace.army.mil)