For sediment transport computations, the user is required to create a Plan file. A sediment plan includes a geometry file (.gxx), a sediment file (.zxx), a flow file (quasi-unsteady: .qxx), and some plan level options data. To create and simulate a quasi-unsteady sediment model, open Sediment Analysis under the Run menu on the main HEC-RAS dialog or press the Sediment Analysis button: . When this option is selected, the Sediment Transport Analysis window will appear as shown in the figure below.
As with Unsteady Flow, a time window must also be specified for the sediment analysis. This requires start and end dates (in DDMMMYYYY format) as well as start and end times (2400 clock) in the Simulation Time Window (below).
To create and simulate an unsteady sediment plan, open the Unsteady Flow Analysis editor by selecting it from the Run menu or pressing the Unsteady Analysis button .
