ST Initial Depths¶
Initial sediment depths are defined in the 'ST initial depths' editor, available from the 'Initial conditions' group in the Setup tree.
Initial sediment depths are given default settings which apply globally (for all links in a model) unless local values are specified for selected links. The local definitions override the default settings.
Figure: The 'ST initial depths' editor
A description of all available settings follows.
Active layer depth¶
The initial depth of the active layer.
Limited passive layer depth¶
The option to specify the initial depth of the passive layer is available only for advanced morphological analyses when the layers layout is set to 'Active and passive layers'.
Passive layer depth¶
The initial depth of the passive layer. This field may be set to zero: in this case, the active layer will be set to the Active layer target thickness by exchanging with the passive layer.
Fractions distribution table¶
This table contains the initial percentage of each fraction within the sediment layer(s). Depending on the type of analysis being conducted, the table contains the distribution for the active layer only, or for both the active and the passive layers. The sum of the initial percentages should equal 100%, otherwise the percentage values will be scaled so that the sum equal 100% during the simulation.
Local conditions locations¶
Local settings for the initial sediment depths can be specified. For each local condition, the location may be defined by:
- List: the local depth is applied to all links (pipes or rivers) in the selected list.
- Entire link: the local depth is applied to the selected link.
- Point on link: the local depth is applied to a specific point (identified by its chainage) on the selected link. The local depth will be interpolated in space between the different points, when multiple points are defined on the same link.
Local depths¶
For each local condition, the local values of initial depth need to be specified here. The local depth of the active layer is mandatory. The local passive layer depth must also be specified for advanced morphological analyses when the layers layout is set to 'Active and passive layers' and when 'Limited passive layer depth' is selected for the default initial depth.
Local fractions distribution table¶
This table contains the initial percentage of each fraction within the sediment layer(s), at the location of the local condition.
Note
Initial sediment depths are not used for advanced morphological analyses when the layers layout is set to 'Fully alluvial model (no layer)'.