1 Introduction
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4. RMC (Right Mouse Click) on the Bounding Polygons blank to open a pop-up menu. In the pop-up menu, select Add Files to browse the polygon file. The land-boundary of the lake will be loaded here.
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The polygon file for this model is "Outline.p2d" and can be found in Data/Bathymetry folder of the Demonstration Models provided above. |
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Figure 3. Add polygon file
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3 Assigning the Initial Conditions
This section will guide you on how to assign the initial conditions, such as the bathymetry, water level, and bottom roughness.
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Figure 6. Assigning initial conditions.
3.1 Assigning the Initial Bathymetry
1. Select the Initial Conditions tab and right mouse click (RMC) on the Bathymetry sub-tab. A new Bathymetry form will appear. In that form, click on Assign to define bathymetric value.
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Figure 7. Assigning bathymetry conditions.
2. The area the user wants to assign the bathymetry data to is set by a poly file. In this case, choose All grid cells
3. The data for bathymetry values are assigned by “Bathymetry.dat” file in Bathymetry folder . This bathymetry file is simply an xyz format.
4. Choose Scatter (XYZ) data and then Add file to browse for “Bathymetry.dat”.
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Figure 8. Assigning bathymetry.
5. After adding the data file, click on the Apply Defined Conditions button to make your changes take effect before selecting the OK button.
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Figure 9. 2DH View of bottom elevation after assigning bathymetry.
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2. Enter the duration of start/ end of the simulation. Note that the boundaries time series should always cover this simulation duration period. Otherwise, otherwise, the model will not run.
3. Enter the Time of Start, Number of Reference Periods, Duration of Reference Periods and Time Step as Figure 24. These values are explained in Table 2 of Build a 2D Lake Model with EE8the Table 1.
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Figure 24. Model run time.
Anchor Table 1 Table 1
Reference Date/Time | The base date of all data and the simulation period. |
Start Date/Time | The model starts the simulation at that time. |
End Date/Time | The model stops the simulation at that time. |
Time of Start (Days) | Number of Julian days after the base date at which to start the simulation. |
Number of Reference Periods | Total simulation time as a multiple of reference periods. |
Duration of Reference Period (hours) | The reference period is usually 24 hours; however, it can be set to another value if required. |
Time Step (seconds) | Also called Delta T, the EFDC model simulation time step. |
Safety Factor | 0 is a fixed time step. Set 0< safety factor <1 to activate the dynamic time step feature. |
# Ramp-Up Loops | Number of initial iterations to hold the time step to a constant during ramp-up. |
Maximum dH/dT | If >0, it is an additional criteria for determining the dynamic time step. |
Growth Step | |
Maximum Time Step | This is a maximum-time step |
4. RMC on Linkage button and set Link EFDC Results to EFDC+ Explorer and set Linkage Output Frequency to 60 minutes. This means that EFDC will record the output every 60 minutes for the display of the model results in the EE. (Figure 5‑2). Note that a smaller output frequency will create a larger output file.
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