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Model test study of low approach channel of Guigang second line shiplock
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摘要: 引航道及口门区通航水流条件一直是多线船闸并列布置中十分重视的问题，如布置和运行控制不当，容易导致相关安全问题。建立了1:100的贵港枢纽下游及船闸引航道物理模型，研究贵港二线船闸的布置方案及其对引航道和口门区水流条件的影响。结合贵港枢纽的特点，分析枢纽不同泄流条件下，二线船闸原布置方案中引航道、一线船闸停泊段及口门区的流速大小，得到影响船闸引航道水流条件的控制工况；在此基础上，提出了优化布置方案，对不同布置长度及透空方式下引航道的水流条件进行了对比分析。根据研究成果，推荐二线船闸下引航道内采用隔流墙，布置长度为135 m，底部不透空或透空高度小于0.50 m的方案。研究成果为贵港二线船闸的优化设计提供了参考。Abstract: The flow condition of the approach channel and its entrance in ship locks which are arranged parallelly is a key problem to scholars. An unreasonable layout of locks may lead to safety problems during operation. A physical model test with the scale of 1:100 is carried out to study the flow conditions of different layouts of the second line ship lock at the Guigang navigation junction. Based on the characteristics of the Guigang junction, the flow conditions of the approach channel of the second line ship lock, and the mooring section and the entrance of the first line are analysed under different discharge conditions. Then the control working condition affecting the flow of the approach channel is obtained, based on which the optimized layout schemes are proposed. The flow conditions of the approach channel in different optimized layouts are compared. According to the results, the scheme with the length of guide wall being 135 m and the height of cross section at the bottom of guide wall being less than 0.5 m is recommended. This study can provide a reference for the optimal design of the Guigang second line shiplock.
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Key words:
- Guigang navigation junction /
- approach channel /
- entrance /
- physical model test /
- flow condition
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图 1 贵港枢纽二线船闸工程1:100模型
Figure 1. Physical model of the Guigang navigation junction with scale 1:100
图 2 二线船闸下引航道隔流墙布置方案
Figure 2. Schemes of the guard wall layout at downstream approach channel
图 3 二线船闸下引航道推荐布置方案典型工况流态(Q=9 000 m3/s，流速箭头矢量上方数字为该点纵向流速，下方数字为该点横向流速)
Figure 3. Flow condition of downstream approach channel under recommended layout scheme (Q=9, 000 m3/s, transverse velocity is marked at the top left of vector arrow, and the longitudinal velocity marked at the bottom left)
图 4 二线船闸最大泄水流量(387 m3/s)引航道流速分布
Figure 4. Velocity distribution of approach channel under the maximum sluicing discharge (387 m3/s) of the second line shiplock
表 1 下游引航道口门区水流条件试验工况
Table 1. Test conditions for the entrance of downstream approach channel
工况 枢纽下泄流量/(m3·s-1) 下游水位/m 枢纽运行方式 DK1 1 000 31.39 电站发电，泄洪闸1#~18#全关 DK2 3 000 34.48 电站发电，泄洪闸8#，10#，12#开启 DK3 5 000 37.53 电站发电，泄洪闸7#~12#开启 DK4 7 000 40.36 电站停机，泄洪闸1#~12#开启 DK5 9 000 42.76 电站停机，泄洪闸1#~18#全开 
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表 2 一、二线隔流墙研究方案
Table 2. Research schemes of the partition wall between the first and second line shiplocks
布置方案 隔流墙长度/m 透空方式 CX-1 110 不透空 CX-2 110 底部透空高度1.5 m CX-3 135 不透空 CX-4 135 底部透空高度1.5 m CX-5 135 封堵第1孔，其余孔透空高度1.0 m CX-6 135 封堵第1孔，其余孔透空高度0.5 m
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