Analysis of Siltation Characteristics of Different Opening Ratios of Open-hole Siltation Plates
Perforated siltation-promoting plates are effective structures for shoreline protection and have been widely used in projects such as beach preservation,riverbank protection,and coastal ecological restoration.The presence of these plates complicates the surrounding flow patterns and increases flow resistance.The flow pattern around the perforated siltation-promoting plates directly influences the movement and transport of suspended sediment.Using a Mixture two-phase flow model,a numerical simulation study was conducted to investigate the flow field characteristics and suspended sediment concentration distribution around siltation-promoting plates with different perforation rates.The results indicate that a recirculation zone appears in the near-wall region at the bottom of the slot behind the perforated siltation-promoting plate(height from the bottom d<H/15).This recirculation zone is primarily located within the range of 0 to 20/3H behind the plate.As the perforation rate increases,the recirculation zone in the near-wall region at the bottom of the slot in front of the plate essentially disappears,and the area of the recirculation zone behind the plate gradually decreases.Both the length and width of the recirculation zone diminish with increasing perforation rate.In the near-wall region at the bottom of the slot behind the plate,the relative suspended sediment concentration at the cross-section behind the perforated areas is lower than in front of the plate.In the region where d>H/15,the relative suspended sedi-ment concentration behind the perforated sections is higher than in front,while the concentration behind the grille sections is relatively high-er than behind the perforated sections.When the inflow velocity is constant,a higher perforation rate of the siltation-promoting plate results in a lower relative suspended sediment concentration around the plate,and the siltation-promoting effectiveness of the plate becomes less ideal.When the perforation rate is 20%,the siltation-promoting effect of the perforated plate is significant.
perforated siltation-promoting platesnumerical simulationflow field distributionsuspended sand concentration distribution
万方数据
维普
