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NETSTARS
it's easier than you think
Application
Broad applications of NETSTARS model include flow simulations of complex river systems of main stream and tributaries, with steep slope or mild slope, of hydraulic jumps, subcritical and supercritical flows in steady-state conditions, of subcritical flows in unsteady-state conditions, and corresponding scour and deposition simulations of river beds. Bed variations in the transverse direction are reflected as a result of subdividing of stream tubes in the cross section to redefine stream tube boundaries in the simulation. Backwater computation (II) in the model is able to simulate flow conditions in subcritical flows, supercritical flows and mixed flows of supercritical and supercritical types. Simulated results of longitudinal bed profile with one single stream tube are equivalent to one-dimensional HEC-6 (1993) simulations.
Sediment movements in natural streams are generally in equilibrium conditions. The equilibrium conditions no longer exist when a reservoir or hydraulic structure is erected on the river. Consequently, characteristics of flow and sediment transport in the stream change continuously as time progresses. Sediment transport formulas for total load, suitable for rivers in equilibrium state, are used to estimate total sediment load in most models. The NETSTARS separates suspended load and bed load in simulation computations and may be used to forecast changing trends in flow behavior, sediment transport characteristics and bed elevations of the river. Simulated results are helpful to reservoir and channel improving work design.
