青山枢纽改造工程整体布置方案

General layout scheme of the Qingshan hydro-junction reconstruction project

澧水青山枢纽改造工程主要是在左汊拆除原有建筑物后新建船闸和挡泄水建筑物。针对青山枢纽改造工程整体布置方案中涉及的枢纽泄洪能力、通航问题,研究了枢纽整体布置、泄洪能力和船闸口门区通航条件。采用整体物理模型试验,对比分析枢纽现状及设计方案的泄流能力、口门区水流通航条件,优化了原设计方案。得出结果:枢纽泄流能力与现状接近,将左汊主流偏向中右部位,改善船闸口门区通航水流条件。推荐方案是:拆除原左汊建筑物并将轴线下移300 m,新建11孔泄水闸,减少1孔泄水闸孔改为连接坝段、左侧2孔泄水闸改为2孔溢流坝。该方案可行,口门区通航条件明显改善。

The Qingshan hydro-junction reconstruction project on the Lishui River is mainly to build ship locks and structures for water retaining and discharge after demolishing the original buildings on the left branch.To tackle the problems in flood discharge capacity and navigation of the hydro-junction involved in the general layout plan of the Qingshan hydro-junction reconstruction project,the paper studies the general layout and flood discharge capacity of the hydro-junction and the navigation conditions of the entrance area in the ship lock.A general physical model is adopted for tests,and a comparative analysis is carried out on the discharge capacity and navigation conditions of the current situation and the design scheme of the hydro-junction.In this way,the original design scheme is optimized.The results show that the discharge capacity of the hydro-junction is close to the current situation;when the main flow of the left branch deflects to the middle and right part,the navigation flow conditions in the entrance area of the ship lock are improved.Therefore,we recommend demolishing the original left branch buildings,moving the axis down 300 m,building a sluice with eleven holes,reducing one-hole sluices to connect the dam section,and changing the left two-hole sluice to a two-hole spillway dam.The recommended scheme is feasible,and the navigation conditions in the entrance area are significantly improved.