径流式枢纽改扩建船闸确定最低通航水位的方法

Method of determining the lowest navigable water level of run-of-the-river hub ship lock

低水头径流式电站往往为不调节水库。为控制库区淹没线,洪水期常采用预泄腾空库容的方式运行,受洪水流量及持续时间不同的影响,不同时期枢纽运行的低水位变化较大,给确定船闸最低通航水位带来了复杂性。以湘江大源渡航电枢纽新建的二线船闸工程为例,采用综合历时曲线法和瞬时水位持续时间、次数进行分析,结合河段的通航实际情况,确定船闸最低通航水位,可为类似径流式枢纽确定船闸最低通航水位提供借鉴。

The low-head runoff type power stations are often non-regulating reservoirs.To control the flooded line in the reservoir area,during the flood period the hub is always run by pre-empting the storage capacity.Affected by the flood discharge and duration,the operation low water level of the hub has great changes during different periods,which makes the determination of the ship lock’s lowest navigable water level complicated.Taking the second-line shiplock project of Dayudayu navigation power hub in Xiangjiang River for example,adopting the synthetic diachronic curve method and instantaneous water level duration&times,and combining with actual navigation conditions of river sections,we determined ship the lock’s lowest navigation level.The method may serve as reference for the determination of the lowest navigable water level of ship locks.