"Evaluation of Sediment Transport Equations and Parameter Sensitivity Analysis Using the SRH-2D Model"The sediment load of a river is one of the key variables in channel dynamics.
Planform pattern, morphology, erosion, deposition and migration of the
channel are in a large part determined by the amount of sediment moved by
the flow in relation to the water and many engineering applications (i.e.
channel stability, reservoir sedimentation, bridge pier scouring) rely on
knowledge of the transport processes for design, management and
maintenance. In order to analyze these processes the use of different
numerical models is indispensable.
SRH-2D is a depth-averaged two-dimensional (2D) numerical model, which
can be used for unsteady flow and non-uniform sediment transport in open
channels. It is stablished using the finite volume method on a hybrid grid. The
sediment transport capacity in this model is computed using four equations
which are developed and recommended for different bed conditions, though
all are developed based on shear stress approach.
Here the model is tested on an investigation reach in the river Spöl in
Switzerland. The model's independence for different grid resolutions of the
flow module is analyzed, so that the grid used for the sediment transport can
accordingly be adopted. The applicability of the implemented four sediment
transport equations for the river reach is evaluated.
The model results show that one of the sediment transport equations
developed for sandy river beds, the Engelund and Hansen (1972) equation
gives a different result compared to the rest. The other three equations,
Parker (1990), Wilcox and Crowe (2003) and Meyer Peter Müller modified by
Wong and Parker (2006) give comparably similar and satisfactory results.