导沙潜坝对双出口水道的分沙效果研究

Effect of submerged sediment diversion structure in two-outlet channel

通过对低水头水利枢纽双出口水道的物理模型试验,研究了不同型式和尺度导沙工程对双出口水道的分沙效果。研究结果表明,在出口断面的上游设置圆弧型或直线型导沙潜坝以及在水流出口断面设置排沙闸,均可不同程度影响分沙效果,分沙比与导沙潜坝的长度和高度以及排沙闸的数量均成正比关系。弧型导沙潜坝的分沙效果优于直线型导沙潜坝,且潜坝长度和高度变化均影响分沙比的增长速率;排沙闸增加到一定数量后,分沙比的增长速率减小,分沙比的增大效果不明显。

Through physical model experiments of double-outlet waterway of low water structure,according to practical works demand,silt separation effect of silt training works in different types and scale on double-outlet waterway is researched.The result indicates both the circular-arc or linear silt-training submerged dam constructed in upstream of the outlet section and desilting sluice set up in the outlet can influence the silt separation effect,the silt separation rate is direct proportional to length and height of silt-training submerged dam and number of desilting sluice.Silt separation effect of circular-arc submerged dam is better than that of linear dam,changes of length and height of submerged dam influence the increase speed of silt separation rate.When the desilting sluice increases to a certain number,the increase speed of silt separation rate is small,the increase of silt separation rate is not significant.