Before a SIAM model can be developed a standard, steady flow HEC-RAS model must be created and run. The SIAM Hydro tab is automatically populated with Hydrology records when a new sediment reach is defined. By default, the new hydrology record will be named "Hydro – (Sediment Reach Name)". Although this record must remain with the sediment reach it was created with, the user can change its name. The Hydro tab is shown in the figure below.
The Profile column is automatically populated with the profile associated with the current plan file. The Ch Q column is also automatically populated with a sediment reach length-weighted channel discharge. These values update if the bounding cross sections of the sediment reach change.
SIAM predicts annual trends and is based on an annualized flow duration curve. Therefore, the populated profiles must be distributed over 365 days. The user enters duration increments in the Duration column, for each profile, in units of days per year. These durations should sum to 365. SIAM will utilize all of the days input for its annualized flow and will not normalize to a year.
Water temperature is also required for each profile. This allows the user to vary the temperature seasonally.
Buttons available on the Hydro tab are:
- Rename the Current Hydrology record:
- Plot the current Duration curve:
An example plot of a full hydrologic record is shown in the figure below.
