老鸦洲浅滩整治试验研究

A model study on Laoyazhou channel reach in the Pearl River

老鸦洲底槽航道是西江船舶进入北江东平水道的必经之地，由于浅滩淤积，严重影响通航．本文通过水动力条件和河床演变分析，揭示浅滩成因及演变特点，通过模型试验研究，找到一个消除浅滩回流，破坏浅滩淤积条件的较优整治方案，并经局部动床模型试验进一步进行了检验和改进．经模型试验研究确定的较优整治方案施工后，老鸦洲底槽航道达到设计水深，通过工程整治成功解决了浅滩淤积问题．

Laoyazhou channel is an important waterway for the tows coming from the West River to the North River. Because of the sedimintation of shoal, it is difficult to maintain normal navigation there. This paper analyses the conditions of hydro-dynamics and evolution processes of the channel, reveales the cause of the shoal-formation and silting characteristics by model test and then optimizes the layout of training works to eliminate the eddy area and improve the silting conditions of the shoal. Examined by the model test with local movable bed, the training plan was improved. According to this improved plan, the training works have been completed and the shoal has been scoured, consequently t the depth of Laoyazhou channel has been satisfied for the designed requirement and the sedimentation problem of the shoal has been successfully solved.