CMS-Flow Multiple-sized Sediment Transport
All of the CMS-Flow model parameters, settings, and output options are controlled from the CMS-Flow Model Control window (Figure 1). The window has several tabs including the Flow tab in which most of the general settings are set for CMS-Flow. To open the CMS-Flow Model Control window, click on CMS-Flow | Model Control. The first tab will be the Flow tab. There are several sections within the tab including Time Control and Hot Start options.
Grain Size Specification
Card | Arguments | Example | Description |
---|---|---|---|
SEDIMENT_SIZE_CLASS_NUMBER | INTEGER | 3 | Specifies the number of grain size classes. |
MULTIPLE_GRAIN_SIZES | INTEGER [REAL, REAL,..., REAL] | 3 0.1 0.2 0.3 | Specifies the number of grain sizes followed by the grain sizes for each size class in mm. |
SEDIMENT_SIZE_CLASS_DIAMETERS | INTEGER [REAL, REAL,..., REAL] | 3 0.1 0.2 0.3 | Specifies the number of grain sizes followed by the grain sizes for each size class in mm. Same as ULTIPLE_GRAIN_SIZES. |
SEDIMENT_SIZE_CLASS_LIMITS | INTEGER [REAL, REAL,..., REAL] | 4 0.07 0.15 0.26 0.34 | Specifies the size classes limits. The first entry is the number of size class limits which is one greater than the number of size classes. |
Fractional Bed Composition
Card | Arguments | Default/Format | Range | Description |
---|---|---|---|---|
BED_COMPOSITION_INPUT | CHARACTER | D50_SIGMA | D16_D50_D84 | D35_D50_D90 | SIZE_CLASS_FRACTIONS | FRACTIONS_DATASET | Selects the method for specifying the bed material composition. |
D50 Dataset and Standard Deviation
Card | Arguments | Default/Format | Range | Description |
---|---|---|---|---|
D50_DATASET | CHARACTER | none | ||
SEDIMENT_STANDARD_DEVIATION | REAL |
D16, D50, and D84 Datasets
Card | Arguments | Default/Format | Description |
---|---|---|---|
D16_DATASET | CHARACTER CHARACTER | [file name] [dataset path and name] | Specifies the D16 dataset path and file name. |
D50_DATASET | CHARACTER CHARACTER | CHARACTER | [dataset path and name] | [file name] [dataset path and name ] | Specifies the D50 dataset path and file name. If the file is not specified than it is assumed to be the model parameters file name (*_mp.h5). |
D84_DATASET | CHARACTER CHARACTER | [file name] [dataset path and name] | Specifies the D50 dataset path and file name. |
CUSTOM_DATASET | CHARACTER CHARACTER | [file name] [dataset path and name] | Specifies a custom dataset path and file name. The custom dataset can be used for any additional user defined dataset. The name of the dataset must be equal to the variable name. For example the D16 dataset must be named D16 and cannot be myD16. |
Custom Datasets
The first approach of specifying the D16 and D84 datasets is by using the Custom Input Datasets section under the Input tab of the CMS-Flow Model Control window. The advantage of using this approach is that the user can edit the datasets once they are created without having to map each dataset as the Elevation dataset. It also avoids having to specify the dataset files and names manually in the *.cmcards file. The steps for specifying the D16 and D84 datasets are outlined below:
- Open CMS-Flow Model Control window and go to the Input tab.
- Create the D16 and D84 datasets using the Custom Input Datasets section on the upper right of the Input tab.
- To create the D16 dataset, click on the New buttom and a window will appear titled New Editable Dataset.
- 2.2 Name the dataset D16 for the D16 dataset or D84 for the D84 dataset. The names must be correct for CMS to be able to interpret the dataset.
- 2.3 Set the initial values by either specifying a spatially constant value or selecting a current dataset.
- Click OK in the New Editable Dataset window
- Repeat steps 2.1 through 2.3 for the D84 dataset.
- Click OK in the CMS-Flow Model Control window
- Save the CMS-Flow project.
Exported Datasets
An alternate approach for specifying datasets is by exporting them into XMDF files and then specifying the file names and paths in the Advanced cards section of the *.cmcmards file. The advantage of this approach is that is allows more flexibility in specifying project alternatives and also works for SMS versions 10.1 and earlier.
D35, D50, and D90 Datasets
Card | Arguments | Default/Format | Range | Description |
---|---|---|---|---|
D35_DATASET | CHARACTER | none | ||
D50_DATASET | CHARACTER | none | ||
D90_DATASET | CHARACTER | none |
Size Class Fractions
For this case, the fractional bed compositions are specified for each size class for all cells and all bed layers. The fractional bed compositions must sum to 1.0.
Card | Arguments | Example | Description |
---|---|---|---|
SEDIMENT_SIZE_CLASS_FRACTIONS | INTEGER [REAL, REAL,..., REAL] | 3 0.2 0.5 0.3 | Specifies the fractional composition for each size class for all cells and bed layers. The first entry is the number of grain size classes. |
Fractional Composition Dataset
Card | Arguments | Default/Format | Range | Description |
---|---|---|---|---|
BED_FRACTIONAL_COMPOSITION_DATASET | CHARACTER CHARACTER | [<grid file>] [<grid name>//"Datasets/<Name>"] | Fractional bed composition file. Necessary when setting BED_COMPOSITION_INPUT to FRACTION_DATASET. |
Bed Layer Thickness
Table 1. CMS-Flow cards related to the general parameters
Card | Arguments | Default/Format | Range | Description | |
---|---|---|---|---|---|
BED_LAYER_THICKNESS_INPUT | CHARACTER | NONE | NONE | CONSTANT | LAYER_THICKNESS | LAYER_DATASET | ||
BED_LAYER_THICKNESS_DATASET | CHARACTER CHARACTER | none | [file] [path] | Specifies the bed layer thickness file and dataset path. | |
BED_LAYERS_MAX_NUMBER | INTEGER | ||||
BED_LAYERS_CONSTANT_THICKNESS | INTEGER [REAL, REAL,..., REAL] | ||||
BED_LAYERS_THICKNESS | INTEGER [REAL, REAL,..., REAL] | ||||
BED_LAYERS_CONSTANT_THICKNESS | INTEGER [REAL, REAL,..., REAL] | ||||
BED_LAYERS_CONSTANT_THICKNESS | INTEGER [REAL, REAL,..., REAL] |
Mixing Layer
Card | Arguments | Default/Format | Range | Description |
---|---|---|---|---|
MIXING_LAYER_CONSTANT_THICKNESS | INTEGER [REAL, REAL,..., REAL] | |||
MIXING_LAYER_MIN_THICKNESS | INTEGER [REAL, REAL,..., REAL] |
Parameters
The general parameters are the water density and temperature. The CMS-Flow cards for the general parameters are described in the table below.
Card | Arguments | Default/Format | Range | Description |
---|---|---|---|---|
HIDING_EXPOSURE_COEFFICIENT | REAL | 1025 | - | Water density in kg/m^3. |
HIDING_EXPOSURE_COEFF | REAL | 15 | - | Water temperature in degrees Celcius. |
Boundary and Initial Conditions
Card | Arguments | Default/Format | Range | Description |
---|---|---|---|---|
SEDIMENT_INFLOW_LOADING_FACTOR | REAL | 1025 | - | Water density in kg/m^3. |
SEDIMENT_FLUX_CELLSTRING | REAL | 1025 | - | Water density in kg/m^3. |
Output Files and Datasets
Card | Arguments | Default/Format | Range | Description |
---|---|---|---|---|
BED_OUT_TIMES_LIST | INTEGER | 1025 | - | Water density in kg/m^3. |
SEDMIX_OUT_TIMES_LIST | INTEGER | 1025 | - | Water density in kg/m^3. |
Examples
- Example 1
SEDIMENT_MAX_ITERATIONS 30 SEDIMENT_STATISTICS 120.0 720.0 BED_COMPOSITION_INPUT D50_SIGMA MULTIPLE_GRAIN_SIZES 6 0.1 0.126 0.16 0.2 0.25 0.31 SEDIMENT_STANDARD_DEVIATION 1.3 BED_LAYER_CONSTANT_THICKNESS 0.5 MIXING_LAYER_CONSTANT_THICKNESS 0.1 MIXING_LAYER_MIN_THICKNESS 0.05 HIDING_EXPOSURE_COEFFICIENT 1.0 SEDMIX_OUT_TIMES_LIST 2 BED_OUT_TIMES_LIST 2 CALC_MORPH_DURING_RAMP OFF
- Example 2
SEDIMENT_MAX_ITER 30 BED_COMPOSITION_INPUT D50_SIGMA SEDIMENT_STANDARD_DEVATION 1.5 MULTIPLE_GRAIN_SIZES 5 0.08 0.12 0.17 0.28 0.45 BED_LAYER_CONSTANT_THICKNESS 0.5 MIXING_LAYER_CONSTANT_THICKNESS 0.02 MIXING_LAYER_MIN_THICKNESS 0.01