东江中游长河段浅滩群航道整治模型试验研究

Model test study on channel regulation of shoal group in long reach of middle reaches of the Dongjiang River

为促进沿岸经济发展,东江中游开展航道扩能升级工程,拟从Ⅴ级航道提升至Ⅲ级。但该段浅滩密布,槽窄水浅,整治应考虑多滩联动效应,整治方式与单滩不同,整治难度较大。根据水文、地形资料,在分析各碍航沙质浅滩滩性的基础上,提出了以疏浚为主、整疏结合的整治原则和措施。通过模型试验,针对长河段开挖航槽导致的水流归槽、流速增大、流态恶化等问题提出开挖复式断面河槽的方案,并基于动床试验得到的挖槽回淤量分布,提出保持航道稳定的建议。试验结果表明整治效果良好,方案实施后全河段基本达到设计要求,为同类航道整治工程提供借鉴经验。

In order to promote economic development along the coast,the middle reaches of the Dongjiang River will carry out capacity expansion and upgrading projects,which will be upgraded from grade V to grade III.However,because of the dense shoal and narrow channel,the effect of multi-shoal linkage should be taken into account in the regulation.The regulation method is different from that of single shoal,which makes the regulation difficult.Based on the hydrological and topographic data and the analysis of the beach characteristics of each obstructed sandy shoal,the regulation principles and measures of dredging as the main method and regulation and dredging as a combination are put forward.Through model tests,the scheme of excavating double-section channel is proposed to solve the problems of water flow return,flow velocity increase and flow pattern deterioration caused by the excavation of channel in long reach,and the distribution of dredging siltation is obtained based on the movable-bed test.The test results show that the regulation effect is good,and the whole river reaches basically meet the design requirements after the implementation of the scheme,which can provide reference for similar waterway regulation projects.