Fixed Parameters

Owned by Kester Scandrett
Last updated: 29 Nov, 2018
4 min read

The Fixed Params viewing option provides access to viewing and editing parameters that are invariant in time. These parameters include:

  • Roughness
  • Cell Angles
  • Cell Connectors (N-S and E-W cell mapping)
  • Wind Shelter(shown only if WSER>0)
  • Shading Factors(shown only if shading is used)
  • GVC Layers (shown only if GVC Model is used)
  • Groundwater Map (shown only if groundwater is activated)
  • Wind Series Weightings (shown only if NWSER>1)
  • Atmospheric Series Weightings (shown only if NASER>1)
  • AHO (eddy viscosity)
  • AHD  (Smagorinsky’s coefficient)
  • Generic IJ Value


Most of the Fixed Params do not have sub-options. Only the GVC Layers option has sub-options. The adjacent graphic shows the options area when the GVC Layers was selected.

When viewing the GVC Layers, RMC'ing on the model provides the user with several options to reset the layering or compute the layering using specified surface and bottom reference elevations. The GVC layering type impacts the assignment process. The vertical layering type needs to have been set to 1 for GVC, or 2 for local Sigma. Bad layers will display the cells whose bottom elevation, relative to SELVREF, is bad when using automatic layering.

The Generic IJ Value option is used to display any data overlay on the model on a cell by cell basis.  The is especially useful when wanting to view the channel index for habitat analysis or display a particular value on every cell to compare with model output or for reporting purposes..  On selecting this option EE prompts for an input file. This file should be of the format: I, J, value.  This file may be comma or tab delimited.  The options button allows the user to enter the parameter name and units.  If this is left blank then EE will prompt the user for this information.  EE retains the link to this data when the model is closed or saved for convenience when reopening the Generic I J value.  It may be changed by browsing to another file.

Cell Connectors

In EE8 and EFDC+ users can connect disconnected sub-domains via N-S and E-W connectors. See Importing Disconnected Sub-domains on how to import multiple domains. To connect the sub-domains, the user should navigate to ViewPlan | Viewing Options: Fixed Parameters | Cell Connectors or Bottom Elevation and select Enable Edit. In order to view any existing connection the N-S / E-W checkbox should also be selected. When the user RMCs on the workspace a number of option for creating, deleting and editing cells connections is displayed as shown in Figure 1. If no cell connections are currently configure then only the New Cell Connections option is accessible, and Delete Cell Connection, Delete All Cell Connections, and Edit Cell Connections are greyed out.

Selecting New Cell Connections provides three options, including the New Single Cell Connection. This allows the user to simply LMC on a border cell on each subdomain and create a connection. The user can also draw polylines for the connections to be made with the New Group Connection Across 2 Polylines. Alternatively, the user may have existing polylines created that can be loaded and used to make the connections with the New Group Connection in existing Polyline Files option.

If the user chooses the option of New Group Connection Across 2 Polylines shown in Figure 1, they can then draw a new polyline on each subdomain.


499pxFigure 1 ViewPlan: Sub-domain connection options.


The user should LMC to start a polyline, and then make LMC each point required to create a polyline on the subdomain border, and then RMC to end the polyline. Once the two polygons have been created, one for each subdomain, EE will prompt the user for N-S, E-W or both kinds of connections by entering the number 1, 2 or 3 respectively as shown in Figure 2. A second integer value or 1 or 2 can be added after a comma to allow the connection options to prioritize the lowest bathymetry between faces and the highest bathymetry respectively. EE will then automatically make the connections for the user as shown in Figure 3.

Note that in some cases some connections may be made that are not wanted by the user and these should be deleted with the Delete Cell Connection option in the RMC form.


Figure 2 ViewPlan: E-W Connections defined by two polylines.


If the connectors line up in a way that does not match with the requirement of the user, it is possible to select the option Edit Cell Connections from the RMC on the connectors. This provides the user with a form to move the connector in a more convenient way with the L index list of both East and West cells. The user should select one cell with a LMC or multiple cells with "Control + LMC" and then use the Up and Down buttons to shift these connections as shown in Figure 4.

An example of the MAPPGEW.INP file that EFDC uses to map the connectors is provided in the appendix for the user's reference.


 
Figure 3 ViewPlan: E-W Connections created via a polyline.




Figure 4 ViewPlan: N-S & E-W connection editor.