三峡水库135m运行阶段永久船闸下引航道泥沙淤积分析  

Sediment deposition analysis of downstream access channel of permanent ship lock during 135m operational phase of Three Gorges reservoir

作　　者：胡兴娥[1] 李云中 李明超[1] 

机构地区：[1]天津大学建筑工程学院 [2]长江水利委员会三峡水文水资源勘测局,湖北宜昌443000

出　　处：《水科学进展》2008年第1期1-7,共7页Advances in Water Science

基　　金：国家重点基础研究发展计划(973)资助项目(2003CB415205);三峡工程“十五”攻关项目(105-3-1)~~

摘　　要：通过实测三峡水库135m运行阶段永久船闸下引航道及口门区泥沙淤积与水沙因子变化，计算分析了下引航道及口门区的淤积量及分布、拦门沙淤积形态、淤积机理及清淤时机，建立了口门含沙量与长江含沙量、口门斜流流速与长江流量、拦门沙淤积高度与来沙量等关系；并结合倒灌异重流理论，计算验证了下引航道及口门区异重流、环流淤积。结果表明，下引航道及口门区主要集中在主汛期（7-9月）淤积，汛末（10～12月）进行一次清淤即可满足航深要求。Based on the abundant data of the sediment deposition and water-sediment factor change in the downstream access channel and entrance area of the permanent ship lock during 135m operational phase, a series of parameters and relationships are analyzed. These parameters include the deposition quantity and its distribution, the deposition configuration of entrance bar, the deposition mechanism and the removal time of sediment. Then, some relational equations are established, such as sediment concentration between the entrance and the Yangtze River, inclined flow velocity of the entrance and discharge of the Yangtze River, the aggradation and the incoming sediment of entrance bar. And, the deposition of the density and circulation flow in the downstream access channel and entrance area are verified by the inverted density flow theory. The results indicate that the depositions in the downstream access channel and entrance area develop mainly in the major flood period （Jul. - Sept. ）, and one desilting in the later flood stage （Oct. - Dec. ） can satisfy the shipping depth demand.

关 键 词：泥沙淤积 异重流 永久船闸 下引航道 三峡水库 

分 类 号：TV145[水利工程—水力学及河流动力学]