摘要
圆中环沉沙排沙池是新型二级水沙分离设施,采用物理模型试验方法研究中心出水环不同高度工况下的排沙特性及最大沉沙粒径.研究表明：圆中环利用倒锥底坡上的高速水流将沉沙汇入冲沙槽,保证了在小于设计流量运行时排出沉积泥沙.同时要求冲沙槽起点至冲沙廊道后有适当的落差,保证水流在冲沙槽内形成高速环流及强挟沙力将泥沙自动排入下游河道.在设计流量条件下,中心出水环不同高度工况处理的泥沙粒径范围为1～84 mm.相比中心出水环不加高工况,中心出水环加高9 em,沉沙分布更均匀,有效沉沙体积及沉沙量增加,排沙时间稍有缩短,沉沙时间增加,排沙耗水率更小.圆中环依靠水力作用并以间歇排沙方式处理推移质泥沙,加高中心出水环可提高处理悬移质能力,减小排沙耗水率.
A model test method is applied to study the characteristics of sediment flushing and the maximum particle diameter of the sediment in the basin with the circular-ring which is a new water and sediment separation device with different heightening conditions of the central outflow ring. The research results show that the desihing inflow flushing trough by using high velocity flow on inverted cone bottom slope guarantees the discharge flow of depositing sediment to be less than design flow. Meantime, proper difference in height is required between the starting point of the flushing trough and the end of the flushing gallery, thus the desihing flow is automatically discharged into the downstream river course by high-speed circulation and strong sediment-carrying capacity in the flushing trough. Under design discharge conditions, the range of the maximum particle-size of sediment is 1 - 84 mm with the central outflow ring of different heights. When the central outflow ring is height by 9 cm, the desihing is distributed more uniformly, and effective desihing production and desilting volume increase. The sediment ejection time decrease and desihing time increases while the water consumption rate is smaller. The experiment results indicate that the ＂ circular-ring＂ achieves automatically the discharge of sediment in an intermittent way, and can drain coarse-grain bed sediment. The treatment capacity of suspended load is increased and water consumption rate is decreased by appropriate heightening of the central outflow ring.
出处
《水利水运工程学报》
CSCD
北大核心
2016年第1期87-92,共6页
Hydro-Science and Engineering
基金
新疆维吾尔自治区自然科学基金资助项目(2014211B001)
关键词
圆中环沉沙排沙池
中心出水环
排沙特性
排沙耗水率
circular-ring desilting and sediment ejection basin
central outflow ring
sediment ejection characteristics
water consumption rate
