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The HabitatRiver demonstration model provides a typical example of a large gravel bed river, with multiple vegetated islands, bars, and side channels. The upstream boundary of the model uses a stepped flow pattern fitting with the IFIM methodology, where flow is gradually increased from low to high flow conditions over a period of three hoursseven days. The downstream boundary condition utilizes a rating curve to define the relationship between the water level and flow in the channel. The model simulates the basic 3D hydrodynamics of the river system at various flow and stage combinations.
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Table 1. Critical Limits for three life stages of Muskellunge and two life stages of Burbot.
Parameter | Range | Muskellunge | Burbot | |||
Adult | Juvenile | Fry | Adult | Juvenile | ||
Water Depth (m) | Minimum | 0.3 | 0.26 | 0 | 0.2 | 0.2 |
Maximum | 4 | 4 | 4 | 4 | 4 | |
Velocity (m/s) | Minimum | 0 | 0 | 0 | 0 | 0 |
Maximum | 1.5 | 1.2 | 0.4 | 1.49 | 1.2 | |
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Using the information provided, the user can begin to populate the Critical Limits Series dialog. Begin by entering the species name into the Criteria ID text box ("Muskellunge Adult"). Next, select Water Depth from the Parameters drop-down list below. Text boxes to enter the minimum and maximum critical limits will appear next to the selected parameter (Figure 3).
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The next step after completing the Critical Limits Series profile for a given species will be to generate the initial time series. The user has the option to specify a window of time for analysis by changing the start and end date in the Initial Model Results Extraction Options. The Cell-by-Cell check box will write out results for each cell being considered in analysis. Using the Series check box next to any one of the selected parameters will plot the time series for that parameter, averaging by cells that meet the defined critical limits criteria.
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To use these data for comparison with other species, the user can write out the information in the plot by using the Export button on the top bar of the Time Series Data Grapher.
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After generating the initial time series, and inspecting the resulting plot, return to the Critical Limits Series dialog by closing the Time Series Data Grapher window. Secondary Processing of Extracted Results options are now available in the Critical Limits Series dialog. The user has the options to run a Domain Average, a Running Average (using a user-defined averaging window), or Single Cell Time Series (using a user defined cell ID).
The Domain Average option will compute a composite habitat index as an average of suitable (1) and un-suitable (0) cells within the domain (Figure 5).
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Figure 5. Composite Habitat Index based on suitable and un-suitable cells in the model domain.
The Running Average option allows the user to define a time window over a number of days and report the Average, Daily Maximum, Daily Minimum, or Twice-daily Maximum/Minimum. The user will be prompted to save the data for these analyses to a separate file.
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Use the Alt+H hotkey combination to open the selection dialog for the Habitat Analysis tools for the ViewPlan. Select option 2 by typing "2" into the text box and pressing OK. The user will then be prompted to open one of the ".habhcl" files created earlier for the Critical Limits Series analysis (Figure 8). Select the desired ".habhcl" file and press OK to load.
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The user can then use the Timing slider on the top right of the ViewPlan to view cells which meet the defined critical limit at any point in the simulation. With the stepped discharge pattern at the upstream boundary, the user can identify changes in suitable habitat at different discharge levels, as shown in FIgure 9, 10, 11, and 12.
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