NETSTARS

The model is not able to simulate secondary currents.
The model is not applicable to lateral movement of sediments due to secondary currents in river bends.
The model should not be used to predict variations of the bed forms.
The cross section of the stream submerged under water is considered as a movable bed. In each time step of sediment computations, the bed of each stream tube is assumed to be uniformly raised or lowered according to computational results of scour and deposition, and subdividing of stream tubes is then performed to redefine stream tube boundaries based on the new channel geometry. By this approach, variations of the channel bed in the transverse direction is reflected.
Sediment transport formulas for total load are, in general, suitable for estimating total sediment load under equilibrium conditions. This model is able to estimate suspended load and bed load separately. The advection-diffusion equation is employed to govern the mechanism of suspended sediment movement. NETSTARS is capable of simulating spatial and temporal variations of concentration of the suspended sediments under nonequilibrium conditions.
The roughness coefficient may be inputted as a given value, or estimated by the model using semi-empirical formula. Due to lack of information on roughness coefficient, one may make a quick and easy estimate and obtain the value through a calibrating process.

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