Spatially varied data, or spatial datasets are integral to the use and application of the CMSFlow numerical engine. The engine uses spatial data for input and each process simulated by the engine creates spatial datasets that can then be visualized and used for post processing in the SMS.
Input Datasets
CMSFlow has several spatially variable input fields. The inputs are sorted by process and labeled with units below.
Hydrodynamics
Variable 
Units 
Symbol 
Description

Bottom Friction 
NA 
(none) 
Roughness of the bottom used to simulate resistance to flow. For example, this could be based on a Manning value.

Sediment transport/Morphology change
Variable 
Units 
Symbol 
Description

D50 
milimeters 
(mm) 
Median grain size for particles in each cell of the grid domain

Hard Bottom 
meters 
(m) 
Constraint for maximum erosion for each cell of the grid domain

Salinity
Variable 
Units 
Symbol 
Description

Initial Concentration 
parts per thousand 
(ppt) 
Initial salinity concentration for each cell of the grid domain

Output Datasets
Hydrodynamics
Variable 
Units 
Symbol 
Description

Water Surface Elevation 
meters 
(m) 
Elevation above mean sealevel computed at the centroid of each cell.

Current Velocity 
meters per second 
(m/sec) 
Velocity components in the u and v directions computed at the top and right side of each cell. The SMS interface interpolates these values over the cell, converts them to global world (x, y) values and displays these as vectors.

Flow Rate 
cubic meters per second 
(m^{3}/sec) 
Flux over each cell.

Sediment transport
Variable 
Units 
Symbol 
Description

Concentration Capacity 
kilogram per meter cubed 
(kg/m^{3}) 
Total transport capacity for flow in the cell. Computed for LUNDCIRP, van Rijn, and Watanabe transport equations.

Sediment Concentration 
kilogram per meter cubed 
(kg/m^{3}) 
Computed suspended sediment concentration at the centroid of each cell

Sediment Transport Rate 
cubic meters per second per meter 
(m^{3}/sec/m) 
Computed transport rate across the right and top faces of each cell. Displayed as a vector quantity in SMS

Morphology change
Variable 
Units 
Symbol 
Description

Bed depth 
meters 
(m) 
Depth below mean sea level to current floor of the model (positive values measured downwards)

Change in depth 
meters 
(m/sec) 
Change in the depth at each cell since the start of the simulation

Salinity
Variable 
Units 
Symbol 
Description

Salinity Concentration 
parts per thousand 
(ppt) 
Concentration at each cell centroid

Related Topics