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BRI-STARS - Bridge Streamtube Model for Alluvial River Simulation
BRI-STARS (BRIdge Stream Tube model for Alluvial River Simulation) model is a generalized semi-two-dimensional water and sediment-routing model with an integrated graphical interface for solving complicated river engineering problems with limited data and resources. This model is capable of computing alluvial scour/deposition through subcritical, supercritical, and a combination of both flow conditions involving hydraulic jumps. Unlike conventional water and sediment routing models, it is also capable of simulating channel widening/narrowing phenomenon as well as local scour due to highway encroachments. It contains a subset of Federal Highway Administration's WSPRO subroutines for computing bridge hydraulics.  

BRI-STARS visual output can be observed in the following screen windows: 

-> Thalweg Profile Window.
-> Streamtubes and Velocities Window.
-> Topographic Changes Window.
Potential Applications
Potential applications of the BRI-STARS can be summarized as: 
-> The model can be used as a fixed-bed model to compute water surface profiles for subcritical, supercritical, or the combination of both flow conditions involving hydraulic jumps. These computations include but are not limited to:
-> Flow profiles in manmade channels with no sediment.
-> Flow profiles over spillways and waterways.
-> Water surface profiles in rivers where bed elevation changes are negligible.
-> The model can be used as a movable bed model to route water and sediment through alluvial channels.
-> The use of stream tubes allows the model to compute the variation of hydraulic conditions and sediment activity not only in the longitudinal but also in the lateral direction. 
-> With the selection of a single stream tube, the model becomes one-dimensional. By selection of multiple stream tubes, changes in cross section geometries in the lateral direction can be simulated. 
-> The armoring option allows simulation of longer term riverbed changes. 
-> With the selection of minimization procedure option, the model can simulate channel widening and narrowing processes.
-> With the selection of WSPRO bridge hydraulics option the model utilizes specialized routines for the computation of flows through highway bridge openings.
-> Maximum potential bridge pier scour for given flood hydrographs are computed through the use of several equations for various pier geometries.
-> Flow diversion problems can be studied through the use of lateral inflow/outflow options.
-> Aggregate mining studies can be conducted by simulating various mining alternatives (quantity and physical location).
-> Dredging studies can be conducted by the use of the lateral sediment outflow option without any water outflow.
-> Bank failures with known rates of bank regression can be simulated through the option of lateral sediment inflow without water inflow.
 
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