| 摘要: |
| 长江中游大马洲水道为微弯河道，上接窑监弯曲分汊河道。监利出口主流的频繁易位直接导致大马洲主流不稳定，滩槽易变，存在进口弯曲、出口宽浅的碍航现象。近期航道整治设计方案的重点是守护丙寅洲与大马洲崩岸，但不足以维护枯水河势及航槽的稳定，建议大马洲河道由“S”型弯道演变至单一弯道时，再进一步采取措施稳定有利河势。通过局部动床模型试验，对丙寅洲不同守护方案的护底排宽度、河漫滩滩面的守护效果进行了试验研究，分析表明初设方案的护底排头前伸接近主槽位置，护底效果优于工可方案；对于丙寅洲上段外滩在主汛期流量下流速大于0.8 m/s时易发生明显冲刷的滩面区域，应采取适当的滩面守护工程措施。 |
| 关键词: 河漫滩 航道整治 护岸 大马洲水道 丙寅洲水道 河床演变 |
| DOI： |
| 分类号:TV147 |
| 基金项目:“十二五”国家科技支撑计划课题（2012BAB05B03） |
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| Analysis of Damazhou waterway evolution characteristics and bank protection schemes of Binyinzhou shoal of the Yangtze River |
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ZHAO Zhi-zhou
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River and Ocean Engineering Department of Chongqing Jiaotong University
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| Abstract: |
| The Damazhou waterway is a slightly meandering channel in the middle reaches of the Yangtze River, abutting on Yaojian bifurcation stream. For frequent translocation of the primary flow outflowing from the Jianli waterway, it directly leads to the instability of the primary flow along the Damazhou waterway and the position of the shoal, and to the change of deep channel. And there is a navigation hindering phenomenon of the meandering inflow section and wide-shallow outflow section. The design scheme is focused on the bank revetment of the Binyinzhou and Damazhou floodplain, and it is not enough to maintain the river regime and waterway stability during the low flow season. Some measures should be taken to stabilize the favorable river regime again when the “shape of S” of the Damazhou waterway evolves into a single meandering channel. Through local movable-bed model tests, different scheme studies on the design width of the bottom-protection mattress and the floodplain protection effects for the Binyinzhou shoal have been carried out. The analysis results show that the bottom protection effects of the preliminary design scheme are better than those of the recommended design scheme of the feasibility studies thanks to the frontage of the bottom protection mattress placed closer to the main channel. As for the considerable erosion along the surface of the upper section of the Damazhou floodplain where the velocity is higher than 0.8 m/s in the major flood period, it is necessary to take some appropriate measures for the shoal protection works. |
| Key words: floodplain waterway regulation bank revetment Damazhou waterway Binyinzhou waterway evolution of river bed |
