CMS-Flow Multiple-sized Sediment Transport

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Figure 1. CMS-Flow Model Control : Model Parameters tab in SMS 11.0.

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]
D50_DATASET CHARACTER CHARACTER | CHARACTER [dataset path and name] | [file name] [dataset path and name ]
D84_DATASET CHARACTER CHARACTER [file name] [dataset path and name]

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.

Figure 2. Creating Custom Datasets for D16 and D84.
Figure 3. SMS project explorer showing Custom Datasets for D16 and D84.
Create D16.png
...by float: right
valign="top" Input Datasets D16 D84.png
All these...



Figure 3. SMS project explorer showing Custom Datasets for D16 and D84.


Exported Datasets

Figure 3. SMS project explorer showing Custom Datasets for D16 and D84.

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.

Figure 3. SMS project explorer showing Custom Datasets for D16 and D84.
Figure 3. SMS project explorer showing Custom Datasets for D16 and D84.
Figure 3. SMS project explorer showing Custom Datasets for D16 and D84.
Figure 3. SMS project explorer showing Custom Datasets for D16 and D84.
Figure 3. SMS project explorer showing Custom Datasets for D16 and D84.


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

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