CMS-Flow Multiple-sized Sediment Transport

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	Range	Description
D16_DATASET	CHARACTER	none
D50_DATASET	CHARACTER	none
D84_DATASET	CHARACTER	none

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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