| 摘要: |
| 山区河流出峡谷进入丘陵地带，河段滩槽交错、多滩并存、上下联动、滩性复杂，一直是我国西南地区航运开发的重点难题。针对山区河流碍航滩群治理思路和原则尚不明确的问题，本文以岷江下游新开河滩群为例，对复杂滩群的碍航特性、水沙特征、河床演变规律进行了分析，并结合物理模型和平面二维水沙数学模型对其整治方案进行了计算分析与优化研究。研究结果表明：对于滩群自上而下“急、弯、险、浅”的问题，要各施其策，对于下“浅”的问题，需采用“整疏”相结合的手段，依托整治建筑物增强浅段水沙动力；对于中“弯、险”的问题，需采用整治建筑物调整水流流路，改善水流流态；对于上“急”问题，重点应放在拓宽航槽，减缓流速。同时在考虑避免下游滩险整治措施对上游滩险的“急、险”有所恶化的基础上，还需综合协调整个滩群的输沙平衡。本文研究成果可丰富山区河流复杂滩群整治技术，也可为国内其它滩群治理提供借鉴。 |
| 关键词: 山区河流 航道工程 水沙条件 滩群治理 |
| DOI： |
| 分类号:U617 |
| 基金项目:山区河流复杂滩险生态航道建设关键技术研究 |
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| Study on the characteristics of navigation-obstructing of typical serial rapids and regulation technology in the downstream of Minjiang river |
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HE Xi1, Dengya2, LI shun-chao3,4,4,4,4,5, LI jia-shi1, JIA guo-zhen1, HE-xiuwei6,4,4,7,4,4,8
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1.Sichuan Communication Surveying Design Institude CO,LTD,Sichuan ChengDu;2.Nanjing Hydraulic Research Institute;3.Sichuan Communication Surveying &4.amp;5.Design Institude CO.,LTD;6.Sichuan Minjiang Port &7.Shipping &8.Electricity Power Development Co.,Ltd
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| Abstract: |
| Some sections of mountain rivers have interlocking rapids and troughs, multiple beaches coexist, up and down linkage, and complex beaches, which have been the key problems of navigation development in southwest China. To address the problem of unclear ideas and principles for the management of serial rapids in mountain rivers, this paper analyzes the navigation-obstructing characteristics, water and sediment condition, and evolution of river bed of complex serial rapids based on the Xinkaihe serial rapids in the lower reaches of Minjiang River. In addition, this paper carries out calculation analysis and optimization research by combining physical model and two-dimensional flow and sediment mathematical model. The results of the study show that for the up-down problems of "sharp, curved, dangerous and shallow", Regulation scheme should be targeted for each rapid. First, for the problems of "shallow" downstream, a combination of "dredging and remediation" should be used to enhance the hydro-sand dynamics of the shallow section. Secondly, for the problem of "curved and dangerous", regulating structure should be used to adjust the flow path and improve the flow pattern. Finality, for the problem of "sharp" upstream, the focus should be placed on widening the channel and slowing down the flow speed. At the same time, on the basis of avoiding the remediation measures downstream from worsening the "rapid and dangerous" of the upstream rapid, it is also necessary to comprehensively coordinate the sand transport balance of the whole serial rapids. The research results of this paper can enrich the regulation technology of complex serial rapids in mountain rivers, and can also provide reference for other serial rapids management in China. |
| Key words: mountainous river channel engineering water and sediment condition serial rapids regulation |
