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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For most Viewing Opt's the Statistics tool on the toolbar is available to compute a range of statistics on the current view. For the Water Column option the Statistics tool provides additional capability. The Statistics tool can compute a time series of the mass weighted averages for any parameter for all or any subset of the model.
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Figure 1 ViewPlan: Viewing Option for Water by 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 7 5 provides 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-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 24 ViewPlan: Water Column, % Irradiance Tool.
Table
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1 Water quality parameter list available for display.
Anchor 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 Figure 35. This tool is access by ALT-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 6. 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 5 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 6. 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 36 ViewPlan: Water by Layer, Habitat Analysis tool.
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 7. 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 7 ViewPlan: Habitat criteria limits.