长距离正反向输水渠道设计若干问题探讨  

Discussion on Engineering Design of Long-Distance and Bi-Directional Canal

作　　者：翟明杰[1] 杨进新[1] 李启升[1] 王雷[1] 李万智[1] ZHAI Mingjie;YANG Jinxin;LI Qisheng;WANG Lei;LI Wanzhi(Beijing Institute of Water,Beijing 100048,China)

机构地区：[1]北京市水利规划设计研究院

出　　处：《人民黄河》2019年第11期97-101,共5页Yellow River

摘　　要：南水北调来水调入密云水库调蓄工程利用现有渠道进行输水,既保留原有正向输水规模,又实现大流量反向调水功能,在国内少有先例。为保证工程利用现有渠道进行反向输水的输水能力及输水安全,同时保证既有渠道的正向输水功能,需要对现状渠道及渠系建筑进行改造,满足正反双向输水的功能要求。经分析,渠道水面线计算结果影响渠系工程的改造设计方案,甚至影响全线泵站的布置方案。通过对渠道水面线进行理论计算并与实际调度运行结果进行对比分析发现,倒虹吸是局部水头损失的主要组成部分,区间沿程损失受渠道内水草生长情况影响较大。由此提出建议:在倒虹吸出口前增设清污机,同时改造倒虹吸进口前清污机;工程建成后需加强对渠道水草的防治管理工作;通过设计方案优化,尽可能增加泵站进出口允许水位变幅,方便调度运行。The project of the water transfer intoMiyun Reservoir in the South to North Water Diversion Project has made full use of the long existing canals,maintained their current water transmission capacity,and fulfilled a large scale reverse water transmission,thus presenting a success which has no precedence in China.The existing canal and buildings need to be renovated for ensuring the dual direction water trans mission.The calculation results of canal water surface profile influence the renovation design scheme of canal and engineering and the design layout of the pumping stations.In this paper,we compared the theoretical calculation results of canal water surface profile with the actual op eration results.It is found that the inverted siphons have a great influence to the local head loss,the loss along the canal is greatly affected by the growth of water plants in the canal.Accordingly,the following suggestions are made:a)To add trash remover in front of the outlet of in verted siphon and to modify the trash remover in front of the inlet of inverted siphon;b)To strengthen the control and management of canal weeds after the completion of the project;c)By optimizing the design scheme,the allowable water level at the inlet and outlet of the pumping station can be increased as much as possible to facilitate regulation and operation.

关 键 词：长距离渠道 正反双向调水 水面线 

分 类 号：TV68[水利工程—水利水电工程]