金家堰省水船闸互通式短廊道输水系统计算

小清河复航工程已开工建设,其中金家堰船闸、王道船闸将成为我国首批带省水池的船闸。结合金家堰船闸省水廊道与闸首廊道互通的特点,分析上、下游与省水池直通输水的可能性,提出相应的水力计算方法。基于兼顾输水时间和省水率的原则,推导出闸首阀门最优提前开启时间与省水池阀门提前关闭时间的关系式。结果表明,金家堰船闸的廊道布置使直通输水时阻力系数较大,有效限制了回流量;闸首阀门不超过最优提前时间时,省水率的变化极小,可按常用公式估算,廊道互通的影响也可忽略不计。

Calculation of filling and emptying system with interconnected short culvert for Jinjiayan water-saving lock

The project of recovery navigation in the Xiaoqing River has been started construction,among which the Jinjiayan Lock,the Wangdao Lock will become the first batch of locks with water-saving basins in China.According to the characteristics of the interconnection between the culvert of water-saving basin and the culvert of lock head for the Jinjiayan Lock,we analyze the possibility of direct water conveyance between the upstream or downstream approach channel and the water-saving basin,and propose the corresponding hydraulic calculation method.Based on the principle of considering both the filling time and the water-saving rate,we deduce the relational expression between the optimal time to open earlier the lock head valve and the time to close earlier the water-saving basin valve.The results show that the culvert layout of the Jinjiayan Lock makes the resistance coefficient of direct water conveyance relatively large and effectively limits the return flow.When the lock head valve opens no earlier than the optimal time,the change of the water-saving rate is tiny which can be estimated by the common formula,the influence of the culvert interconnection is negligible.