6.8 Initial Conditions

6.8.1 Command Status

Optional - If no initial conditions are set then water level and initial velocites are set to zero. Where bathymetry is greater than 0.0 mRL then cells are set to be dry.

6.8.2 Description

This section describes initial condition construction specific to the 3D hydrodynamic simulation class. It is an extension of Section 5.15. Initial condition and restart commands adhere to the command layering approach described elsewhere.

Table 6.8: Initial Condition Model Implementations
Model Implementation Description
Spatially Varying Spatially varying initial conditions from input files.
Table 6.9: Initial Condition Commands
Command Description
Initial Conditon 3D Optional - Allows for user specified spatially varying water level and spatially and depth varying velocity initial conditions.

6.8.3 Spatially Varying

This initial condition implementation uses a csv file to specify initial water levels and velocities at specific 3D cells. It can be used for all 3D cells, or for specific local features to override prior specifications.

! Initial Conditions - Global initial water level with local initial water level and 3D velocity override
Initial Water Level == 2.5 ! {0.0} Global initial condition
Initial Condition 3D == ..\model\csv\IC_ML_3D_001.csv ! {No default} filepath

The CSV file requires the following columns.

  • Header: ID - 3D cell ID (not 2D cell ID)
  • Header: WL - Water level (mRL)
  • Header: U - U velocity (m/s)
  • Header: V - V velocity (m/s)

Initial conditions are applied only to the listed cell IDs. The file can include all 3D cell IDs or a subset of 3D cell IDs.

The example below shows an initial condition 3D file for a coastal lake using a subset of model cells.

IC_ML_3D_001.csv - This lake resides over 18 3D cells (6 2D cells x 3 layers deep)
ID, WL, U, V
69, 1.1, 0.00, 0.00
70, 1.1, 0.02, 0.01
71, 1.1, 0.03, 0.02
84, 1.1, 0.05, 0.03
85, 1.1, 0.06, 0.04
86, 1.1, 0.08, 0.05
87, 1.1, 0.09, 0.06
88, 1.1, 0.10, 0.08
89, 1.1, 0.12, 0.09
126, 1.1, 0.13, 0.10
127, 1.1, 0.15, 0.11
128, 1.1, 0.16, 0.12
135, 1.1, 0.18, 0.14
136, 1.1, 0.19, 0.15
137, 1.1, 0.21, 0.17
198, 1.1, 0.22, 0.18
199, 1.1, 0.24, 0.20
200, 1.1, 0.25, 0.21