Author(s): Wu Xiaoming; Deng Jiaquan
Linked Author(s):
Keywords: Honghua key hydraulic project; Navigational hydraulics; Scale model
Abstract: The navigational hydraulic problems for a large key hydraulic project – the Liujiang key project in Guangxi province which is currently under pre-design are studied. Through the comparison of different schemes for the entrance and exit layouts of the ship lock, a layout scheme suitable for the project is optimized on a normal scale model which has geometry scale1/100. Based on the analysis on generic navigational problems in the low head key hydraulic project, some common hydraulic characters are summarized. The study shows that the navigational problem at the entrance is mainly that the lateral flow velocity near the access wall excesses the limit. The methods for solving this problem are adjusting the integral upstream flow field and reducing the dynamic force of the upstream incoming water entering the ship lock. The navigational problem at the exit of the ship lock is mainly that when the discharge is small the lateral velocity created by the water flowing towards the downstream navigation channel excesses the limit. The methods to solve this problem are reasonably controlling the operation of the flood gates and coordinating suitable engineering measures. In addition, this study investigates the re-use of temporary construction diversion buildings and proposes the suggestion for retaining some parts of the temporary cofferdam as the permanent building to reduce the cost of the project.
Year: 2001