For non-cohesive fractions, it is possible to select to include in the simulation either bed load or suspended load, or both. Corresponding transport theory must be defined accordingly.
Bed load transport model
The following transport models are available for non-cohesive fractions:
· Engelund-Hansen
· van Rijn
· Engelund-Fredsøe
· Meyer-Peter & Muller
· Adjustable Smart-Jaeggi
· Yang - sand
· Yang - gravel
· Wilcock & Crowe
· Parker
· Ackers & White
Bed load factor
A bed load factor is applied to the selected transport formula. It is a simple multiplication factor applied to the calculated transport rate. The default neutral value is 1, and values can vary between 0.5 and 2.0. Beyond this range the validity of the chosen formula could be questioned.
Suspended load transport model
The following transport models are available for non-cohesive fractions:
· Engelund-Hansen
· van Rijn
· Engelund-Fredsøe
· Meyer-Peter & Muller
· Adjustable Smart-Jaeggi
· Yang - sand
· Yang - gravel
· Garcia & Parker
· Ackers & White
· Lane-Kalinske
Suspended load factor
A suspended load factor is applied to the selected transport formula. It is a simple multiplication factor applied to the calculated transport rate. The default neutral value is 1, and values can vary between 0.5 and 2.0. Beyond this range the validity of the chosen formula could be questioned.
Additional parameters for the Adjustable Smart-Jaeggi formula
When the Adjustable Smart-Jaeggi formula is selected for the non-cohesive fraction, the following parameters are also required, for both bed load and suspended load.
d90/d30
Describes the uniformity of sediments for the faction.
Angle of repose
The angle of repose is specified here.
Slope dependency
The slope dependency is either defined as a function of the bed slope or the water surface slope.
Shields stress
The Shields stress is either defined as total or skin friction.
Coefficients and exponents
Parameters a1 to a8 are coefficients and exponents used in the Smart-Jaeggi formula. Refer to the MIKE 1D reference manual for more detailed information.
The following global parameters are required for cohesive fractions. Global values are applied throughout all calculation points in the river network, unless local values have been defined.
Exponent
The exponent used in the erosion equation, from MIKE 1D reference manual.
Erosion shear stress limit
The erosion shear stress limit is specified here.
Erosion coefficient
The erosion coefficient used in the erosion equation, from MIKE 1D reference manual.
Deposition shear stress limit
The deposition shear stress limit is specified here.
Local values may be specified in the table. Local values are applied at specific locations defined by Branch name and Chainage.