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The Water Column Viewing Option is the primary 2D viewer for all of the water column related parameters as shown in Figure 1. The water column may be viewed by layer or by depth. For the former, the first options to set are the Layer Settings. There are three layering options for processing the water column data. They are Depth Avg for depth averaged results, Bot Layer for viewing the bottom active water column layer (this varies in the GVC model, standard sigma model this is layer 1) and a specified layer.

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If water quality is being simulated the Wtr Quality option button is enabled as is the parameter dropdown list. In addition to the 22 EFDC water quality parameters, EFDC_Explorer has 26 derived parameters that can also be displayed. Table 1 provides a complete list of the EFDC and EFDC_Explorer derived parameters.

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The ability to determine the % Bottom Irradiance can useful when the user is interested in cases where the amount of light penetration must be determined, such as where there are macrophytes or aquatic vegetation. Note that this tool only determines the potential for irradiance, and does not allow for day or night or factor in cloud cover etc.

Select Other option, from the parameter dropdown list, select % Irrad Water or % Irrad bottom, the result can be displayed as in Figure 2 and Figure 3.

Pressing Alt+B accesses the Bottom Irradiance Tool. The user is first prompted for analysis of a polygon, which must then be loaded, or the whole model.

The subsequent option form is shown in Figure 24. The user should enter the Maximum Bottom Depth in meters. Cells deeper than this depth are displayed as white. As depths will vary due to tides it is usually most useful to calculate an average for the Depth Criteria Approach. The user should finally enter the Irradiance Target as a percentage. EFDC_Explorer will then calculate all the cells that fit the criteria and calculate statistics for those cells.

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Figure 2
Figure 2
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Figure 2

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Figure 3
Figure 3

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Figure 4
Figure 4

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Figure 4  ViewPlan: Water Column, % Irradiance Tool.



Table 75 Water quality parameter list available for display.

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Table 1
Table 1

EFDC/HEM3D Parameters

EFDC_Explorer Derived Parameters (cont.)

Abbrev

Name

Abbrev

Name

CBact

Cyanobacteria

POrg C

Particulate Organic Carbon

Alg-D

Diatom Algae

POrg N

Particulate Organic Nitrogen

Alg-G

Green Algae

TKN

Total Kjedahl Nitrogen

RPOrg C

Refractory Particulate Organic Carbon

Tot N

Total Nitrogen

LPOrg C

Labile Particulate Organic Carbon

Chl a

Chlorophyll a

DOrg C

Dissolved Organic Carbon

TION

Total Inorganic Nitrogen

RPOrg P

Refractory Particulate Organic Phosphorus

LimP-C

Algae Limit: Phosphorus-Cyanobacteria

LPOrg P

Labile Particulate Organic Phosphorus

LimP-D

Algae Limit: Phosphorus-Diatom Algae

DOrg P

Dissolved Organic Phosphorus

LimP-G

Algae Limit: Phosphorus-Green Algae

TPO4-P

Total Phosphate

LimN-C

Algae Limit: Nitrogen-Cyanobacteria

RPOrg N

Refractory Particulate Organic Nitrogen

LimN-D

Algae Limit: Nitrogen-Diatom Algae

LPOrg N

Labile Particulate Organic Nitrogen

LimN-G

Algae Limit: Nitrogen-Green Algae

DOrg N

Dissolved Organic Nitrogen

LimNP-C

Algae Limit: N and P-Cyanobacteria

NH4-N

Ammonia Nitrogen

LimNP-D

Algae Limit: N and P-Diatom Algae

NO3-N

Nitrate Nitrogen

LimNP-G

Algae Limit: N and P-Green Algae

PBioSi

Particulate Biogenic Silica

LimL-C

Algae Limit: Light-Cyanobacteria

AvailSi

Dissolved Available Silica

LimL-D

Algae Limit: Light-Diatom Algae

COD

Chemical Oxygen Demand

LimL-G

Algae Limit: Light-Green Algae

DO

Dissolved Oxygen

LimT-C

Algae Limit: Temperature-Cyanobacteria

TActM

Total Active Metals

LimT-D

Algae Limit: Temperature-Diatom Algae

FColi

Fecal Coliform

LimT-G

Algae Limit: Temperature-Green Algae

MacAlg

Macroalgae

LimA-C

Algae Limit: All Factors-Cyanobacteria

EFDC_Explorer Derived Parameters

LimA-D

Algae Limit: All Factors-Diatom Algae

Tot C

Total Organic Carbon

LimA-G

Algae Limit: All Factors-Green Algae

Tot P

Total Phosphorus

TSI

Carlson's Trophic State Index

TORN

Total Organic Nitrogen

TSS

Total Suspended Solids (Inorg & Org)

TORP

Total Organic Phosphorus

POrg P

Particulate Organic Phosphorus

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The user may undertake a habitat analysis of the water column when the Water by Layer drop down is selected as shown in Figure 35. This tool is access by Alt+H. The user may analyze any of the parameters displayed in the Options in frame in the right hand column. The user should set critical levels (in this case temperature, oC), critical depths and critical duration (in hours) and press Display. EFDC will then calculate the number of cells for which these criteria apply, displaying the area and volume in the yellow Habitat Criteria box, as well displaying the critical cells. A second critical duration may also be displayed concurrently.

The user may undertake several kinds of habitat analysis from ViewPlan by selecting Alt+H.  This will open the EEMS Habitat Tools option form as shown in Figure 36.  Select 1, 2, or 3, for the Thermal and Depth Criteria Limits, Critical Limits, or HSC options respectively.  The latter two options are only available if they have been correctly configured as described in Habitat Analysis.

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Figure 35
Figure 35

Figure ViewPlan: Habitat tools.


The most basic option is option 1, Thermal and Depth Criteria Limits. This analysis tool was initially implemented to support studies on Manatee (a.k.a. Sea Cow; Trichechus manatus) populations in the Chassahowitzka Estuary.  This kind of analysis of the water column is available when the Water by Layer drop down is selected as shown in Figure 46.  The user may analyze any of the parameters displayed in the Viewing Options frame.  In the Critical Habitat Analysis form the user should set critical levels (in this case temperature, oC), critical depths and critical duration (in hours) and press Display.  EE will then calculate the number of cells for which these criteria apply, displaying the area and volume in the yellow Habitat Criteria box, as well displaying the critical cells. A second critical duration may also be displayed concurrently.

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Figure 46
Figure 46

Figure ViewPlan: Water by Layer, Habitat Analysis tool.

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Selecting option 2 or 3 will cause EE to prompt the user for the habitat limits or criteria file. EE will then display areas satisfied by the criteria, as shown in Figure 57. This option is available for all the parameters that may be set in the habitat critical limits, or suitability criteria.  If a cell is dry it is shown as grey. For the critical limits the default color ramp is white (0) to green (1).  For habitat suitability criteria the same principle applies, however shades of green from 0 to 1 are displayed.

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Figure 57
Figure 57

Figure ViewPlan: Habitat criteria limits.

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