澜沧江曼厅大沙坝水道河床演变及航道整治

Riverbed evolution and channel regulation of Manting sandbank waterway in Lancang River

以曼厅大沙坝浅滩航道整治为依托,针对滩险整治过程中提升航道等级并维护航槽稳定的问题,从水文特征、河床演变和历史航道整治状况等3个方面总结澜沧江曼厅大沙坝河段河势变化及航道现状,分析此滩险河段现有的滩槽格局及滩险成因,提出以守护为基础、采用中枯水两级整治思路的整治方案。结果表明,在兼具库区特征的滩险整治过程中,采用疏浚增加航槽水深,并布置整治建筑物守护洲滩、束水攻沙,能够提高航道尺度,保障航槽稳定。

Based on the channel regulation of shallow shoal of the Manting sandbank waterway,aiming at the problems that it needs to improve to be a higher-level waterway and it is necessary to guarantee the stability of channel in the rapids regulation,we summarize the change of river and the current status of the channel from three aspects,such as the hydrological features,evolution of river bed,and status of historic waterway regulation,analyze the cause of the shoal and the existing shoal pattern.We propose the scheme of two levels regulation that it is based on the concept of guarding,and uses the regulation methods in normal and dry water seasons.The results show that in the regulation process of rapids with the reservoir characteristics,dredging can deepen the depth of channel,arranging regulation building can defend the beaches,and narrow the waterway to attack the sand.These measures can improve the channel size and ensure the stability.