白石窑一线船闸闸室尺度变更后下引航道通航水流条件试验研究

Experimental research on navigation condition of downstream approach channel after change of lock chamber’s size of Baishiyao first line shiplock

白石窑枢纽位于广东省英德市上游约25 km的北江干流上,是北江干流上的第3个梯级。为提高船闸通过能力,将白石窑一线船闸闸室长度由140 m延长至220 m,船闸尺度为220 m×23 m×4.5 m(长×宽×门槛水深)。通过建立1:100比尺的物理模型,对扩建后下引航道口门区通航水流条件进行研究,提出下引航道口门区通航条件的改善措施。研究表明:开挖三板洲及增设直线隔流堤等措施对改善下引航道口门区通航条件是有效的。

Baishiyao hub locates on the Beijiang River main stream,25 km upstream from Yingde city.It is the third cascade of the Beijiang River.To improve the passage capacity of the ship lock,the length of the lock chamber of the Baishiyao first line ship lock is extended from 140 m to 220 m.The effective scale of first-line ship lock design is 220 m×23 m×4.5 m(length×width×doorsill water depth).This paper studies the flow condition of the entrance gate of the downstream approach channel by establishing a 1:100 scale physical model.Through the overall hydraulic model test,the paper puts forward the improvement measures of the navigation condition in the entrance area of the downstream approach channel.The study shows that measures such as the excavation of Sanbanzhou and the addition of linear dikes are effective to improve the navigation condition at the entrance of the downstream approach channel.