摘要
为研究鲁东北引水枢纽工程水沙演变特征,利用水工模型试验开展河床水沙演变与闸前冲砂分析。结果表明,泥沙淤积厚度与累计运营时间具有三阶函数关系,但运营累计80 d后泥沙淤积厚度放缓,且淤积速率为先快后慢;断面与排沙闸距离愈远,则泥沙淤积厚度愈大,排沙闸可使泥沙悬浮沉降具有分层性,进而减少闸前泥沙淤积,相同断面上的泥沙淤积受横断面距离比参数影响较小;冲砂试验前100 min仅出渠流量受之影响,冲砂试验150 min时出、入渠流量达一致性,而该节点渠内水位降幅减小;出渠含沙量高于入渠含沙量,但差幅随冲砂进程减小,最终稳定在6.8%。论文研究认为引水枢纽工程并不一定需要人工泄降冲淤,可借助排沙闸的存在利用汛期上游河道泄流完成这一目标,节省引水成本。
In order to study the characteristics of water-sediment evolution of the Northeast Water Diversion Project in Shandong,hydraulic model tests are used to analyze the river bed water-sediment evolution and sand washing before the sluice.Result shows that the sedimentation thickness has a third-order function relationship with the accumulated operation time.However,after 80 days of operation,the sedimentation thickness slows down,and the sedimentation rate is first fast and then slow;the greater the distance between the section and the desilting gate,the greater the thickness of the sedimentation.The desilting gate can make the suspended sedimentation of the sediment layered,thereby reducing the sedimentation in front of the gate,the sedimentation on the same section is less affected by the cross-sectional distance ratio parameters;100 minutes before the sand washing test,only the outflow rate is affected.At the 150th minute of the sand washing test,the outflow and inflow reach the same level,and the drop of the water level in the canal at this node is reduced;the outflow canal is higher than the inflow.However,the margin decreases with the sand washing process,and finally stabilizes at 6.8%.This article believes that the water diversion projects do not necessarily need to be artificially drained and eroded.The existence of the desilting gate can be completed with the help of the upstream river discharge during the flood season,which can save the water diversion costs.
作者
白云
BAI Yun(Liaocheng River Engineering Management Service Center,Liaocheng 252000,China)
出处
《海河水利》
2022年第2期101-105,共5页
Haihe Water Resources
关键词
引水枢纽
水沙演变
模型试验
含沙量
water diversion project
water-sediment evolution
model test
sediment concentration
作者简介
白云(1982-),男,工程师,主要从事水利水电工程、河道工程管理工作。
