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EEMS also supports a spatially variable AHD option The user needs to check both of the Spatially Vary checkboxes, in which case the Assign button is also enabled.  Selecting the Assign button displays the form shown in Figure 2.  EE uses a new file called AHMAP.INP to store a cell by cell list of AHO and AHD.  If the AHO in the AHMAP file is a negative number, EFDCPlus will use the cell area times the input value to compute the cell’s AHO according to the equation above.

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To ensure that the correct values have been assigned to the correct regions, the AHO and AHD may also be visualized in ViewPlan using the Fixed Params viewing option.

Figure 2  Setting spatially varying AHO and AHD. 

When Activate HMD with Smagorinsky, Wall Drag and WC Diffusion is selected (ISHMD=2), then the full HMD is used as well as wall effects. This option also applies diffusivities to all constituent transport, which includes salinity and temperatures. This option should be used when simulating a very uniform flow system is constituent transport is needed. The resulting horizontal diffusivity from these options can be viewed from within ViewPlan provided velocities are also available.  The vertical eddy viscosities and diffusivities (AV & AD arrays in EFDC, respectively) can also be viewed if the user configures the Internal Array Viewer (See Appendix A) to include these arrays. 

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The Vertical Eddy Viscosities & Diffusivities frame allows the user to set the Time Advance Filter and Vertical Eddy Viscosity as well as Vertical Molecular Diffusivity.  The Maximum Magnitude for Diffusivity Terms allows the user to set the Maximum Kinetic Eddy Viscosity as well as the Maximum Eddy Diffusivity.

Turbulent Intensity

Figure 3 shows the Turbulent Intensity tab. Generally, only the Vertical Turbulence Options will be changed. At the current time, production runs should set the Advection Scheme to 1 and the Sub-Option to either Galerpin (Sub-option=1), Kantha and Clayson (Sub-option=2) or Kantha (Sub-option=3).

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The Turbulence Closure Constants may be changed after the Modify check box is selected. However, these constants should not be changed without good justification.

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Further turbulence modification options are also available under the Miscellaneous Options tab shown below in Figure 4. These options allow various momentum corrections which may be enabled with the Momentum Correction Flag. When the flag is set to zero momentum corrections are disabled; when set to 1 they are enabled.

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