葛洲坝坝区下游河势与大江航道防浪设施选择

River Regime Downstream in Gezhouoa Dam Zone and Selection of Works Unmaking Waves in the 1st Channel

本文介绍以大江航道防浪设施选择为重点的葛洲坝坝区下游河势研究第二阶段的试验成果。首先以目测的“右岸爬浪”为指标,初步评估了各类治导工程的防浪效果,然后用电测电算的航道内波高进行了验证。结合电厂下游水位及施工条件,对“开挖二江河槽”、“延长大江隔流堤”、“延长二江导流堤”、“填筑江心洲”等方案作了全面比较;推荐后两者为进一步研究的基本方案。

This paper reports the experimental results of the 2nd stage model study on the river regime downstream in Gezhouba dam zone with emphasis on the selection of works unmaking waves in the 1st channel. First, based on the index of wave climbing height observed on the right bank, the effects unmaking waves were primarily evaluated for various river training works. Then, the effects were verified by wave height data within the 1st channel, which were measured by the 'wave recorder-computer' system. Considering the water level downstream of the power plant and practical construction conditions, an overall comparison is made for the possible alternatives such as 'excavating the 2nd channel', 'extending the division dyke of the 1st channel', 'extending the training dyke of the 2nd channel', 'building a midchannel island', etc. The last two are recommended as the basic alternatives for further study.