| Popis: |
The flow capacity of urban stormwater drainage channels in major cities of India are gradually being reduced due to increased quantities of solid waste being introduced into these systems. During low flows, the solid waste forms deposits within these open drainage channels. These must be regularly cleaned to ensure that the drains function at an optimal hydraulic capacity in order to limit overflows. This places a significant burden on the operators of these systems. The erosion of deposits during high intensity rainfall, combined with flooding can release significant amounts of pollutants into areas adjacent to these channels. This can have a high economic and social impact as these areas have experienced a high level of development in recent years. One of the ways to minimize deposits, and reduce the management burden, is to provide invert traps in the drainage system at pre-determined locations to reduce the deposits and concentrate the solid waste at a smaller number of known locations . Once full, these can then be emptied within a planned programme of work. This paper describes the initial sediment retention studies of various configurations of invert trap using Computation Fluid Dynamics (CFD) modeling. A 2-D CFD model, using the FLUENT software, was implemented to solve the continuous flow phase and to estimate the flow patterns. This study has examined three different trap configurations with different types of particle type over a range of six discharges (low, medium and high). Early results indicate that the trap performance is sensitive to the discharge and the trap configuration. Further work is in progress to determine the optimal shape for trapping efficiency of solids under Indian conditions. |
