# Presentation: 424074

## Environmental Time Functions&Segment Parameters

## Environmental Time Functions

- Varies Conditions over Simulation Period
- Environmental properties with multiple time functions:
- Temperature
- Water velocity
- Light extinction
- Time Functions can have their own intervals

## Segment Parameters

- Varies Environmental Conditions Spatially
- Scales Environmental Conditions for Individual Segments.

## Working Together

- Segment parameters can point to individual time functions
- User can specify up to 4 temperature functions.
- User can specify segment temperature by point to 1 of the 4

## Seg 1

- Seg 2

- Temperature Function 1
- Temperature Scale 1
- Temperature Time Series used is 1

- Temperature Function 2
- Temperature Scale 1
- Temperature Time Series used is 2

## EUTRO Module Time Functions

- Water temperature (4) (degrees C)
- Water velocity (4) (m/sec)
- Light intensity (langleys)
- Fraction of daylight (fraction)
- Wind speed at 10 meters (m/sec)
- Light extinction coefficient (5) (per meter)
- Ammonia & phosphorus benthic flux (mg/m2-day)
- Zooplankton
- Ice cover (fraction)
- Air Temperature (degrees C)
- Reaeration rate constant (per day)

## EUTRO Module Segment Parameters

- Water velocity time function pointer
- Water temperature (time function pointer and multiplier)
- Reaeration rate multiplier
- Incoming solar radiation multiplier
- Light extinction (time function pointer and multiplier)
- Fraction of light intercepted by canopy (fraction)
- Ammonia & phosphorus flux multipliers
- Sediment oxygen demand, SOD (g/m2-day)
- SOD temperature correction factor
- Zooplankton

## Additional EUTRO Module Parameters 

- CBOD deoxygenation rate constant scale factors (3)
- Tsivoglou reaeration escape coefficient
- Dam elevation (m)
- Dam pool water quality coefficient
- Dam type coefficient
- Fraction of bottom area covered by benthic algae

## SOD - EUTRO Module Parameters – (to be implemented)

- Particulate Organic Nitrogen (3 types) mg N/g
- Dissolved NH3 (3 types) mg N/L
- NO2, mg N/L
- NO3, mg N/L
- Particulate Organic Phosphorus (3 types), mg P/g
- Dissolved PO4, mg P/L
- Particulate Organic Carbon (3 types), mg O2/g

## TOXI Module Time Functions

- Water temperature (4) (degrees C)
- Water velocity (4) (m/sec)
- pH of water column & benthic segments
- Normalized light intensity (photolysis option 2)
- Wind speed at 10 meters (m/sec)
- Bacteria population (Water & Benthos)
- Air temperature (degrees C)
- Reaeration rate constant (per day)
- Chlorophyll-a (mg/L)

## TOXI Module Segment Parameters

- Water velocity time function pointer
- Water temperature (time function pointer and multiplier)
- Wind speed multiplier
- Reaeration rate multiplier
- Dissolved organic carbon, DOC (mg/L)
- Fraction organic carbon for solids 1, 2, 3 (fraction)
- Chlorophyll a concentration (mg/L)
- pH
- Light extinction coefficient (per meter)
- Oxidative radical concentration (moles/L)
- Bacteria Population (cells/100 mL)
- Extra environmental property
- Overall decay rate constant for chemicals 1, 2, 3 (per day)

## MERC Module Time Functions

- Water temperature (4) (degrees C)
- Normalized light intensity (photolysis option 2)
- Wind speed at 10 meters (m/sec)

## MERC Module Segment Parameters

- Water temperature (time function pointer and multiplier)
- Wind speed multiplier
- Dissolved organic carbon, DOC (mg/L)
- Light extinction coefficient (per meter)
- Oxidation rate constant (per day)
- Methylation rate constant (per day)
- Bacterial demethylation rate constant (per day)

## HEAT Module Time Functions

- Cloud cover (4) (percent)
- Wind speed at 10 meters (4) (m/sec)
- Air temperature (4) (degrees C)
- Dew point (3) (degrees C)
- Light extinction coefficient (4) (per meter)
- Wind sheltering function (unitless)

## HEAT Module Segment Parameters

- Cloud cover pointer and multiplier
- Wind speed pointer and multiplier
- Air temperature pointer and multiplier
- Dew point pointer and multiplier
- Light extinction pointer and multiplier
- Wind sheltering pointer and multiplier

## Kinetic Time Functions

- 	Steps to specify time functions:
- Point and click on “Used” field to select or de-select time functions
- Highlight Time Function
- In bottom window, fill in time function values for beginning and ending times
- As needed, add time rows by pressing “+ Insert” and edit Date, Time, and Value
- Continue selecting time functions and entering data
- Press “OK” and save

## Segment Properties - Parameters

- Steps to specify parameters:
- Press  “Parameters” to enter screen
- Highlight and edit parameter values for rows
- Press “OK” and save