Numerical Investigation on the Hydraulics of River Lateral Intakes by SSIIM2 Software

In areas with sediment laden floodwater, sediments are carried into the intakes and decrease the
channel conveyance capacity. These sediments are settled at different locations, including the
separation zone at the upstream section of the lateral channel. Therefore, it is important to determine
the length and width of separation zone. In this study, hydraulics of the flow in an intake from a
rectangular channel using SSIIM2 is investigated. The ratio of intake width to main channel width,
diversion angle, Froude number and ratio of diverted discharge on separation zone dimensions are
among the effective parameters in the hydraulics of intakes. These parameters were investigated and
numerical results were compared with those of experimental ones. There was a good agreement
between the numerical and experimental results. For estimation of the above parameters several
equations were developed. k-3 turbulence model was also found to be suitable for intakes hydraulics.