向家坝电站运行对长江泸州河段通航条件的影响研究

发布时间：2018-04-19 14:04

  本文选题：向家坝水电站 + 通航条件　； 参考：《重庆交通大学》2016年硕士论文

【摘要】：我国许多河流通航不仅受到枯季和洪季水位变化的影响,还会受到其他的因素影响,特别是是河道上游修建的水电站。向家坝水电站是金沙江梯级开发四座巨型水电站中的最末一级,是一座以发电为主要目的,兼具拦沙、改善航运、防洪、灌溉等综合功能的特大型水利枢纽工程。研究向家坝电站运行产生的非恒定流对长江泸州河段通航条件的影响,对于确保航行安全,避免水运事故的发生,具有重要的意义。本文依托长江上游干支流汇合口航道整治技术研究项目,以计算流体力学、泥沙运动力学等学科理论为基础,应用MIKE21软件里的HD和ST模块建立了水动力模型与泥沙模型。模拟了天然情况下和向家坝电站运行情况下泸州河段的水流以及泥沙特性,分析向家坝电站运行后对于泸州河段通航条件的影响,提出了在新的水沙条件下河段航标布置的建议,主要得到的结论如下:(1)向家坝电站运行情况下,通过对泸州河段水面线、流速、水流动力轴线的分析,虽然在向家坝电站运行后泸州河段的水流条件发生改变,但不会对船舶通航造成影响,泸州河段的航道条件满足Ⅲ级航道通航的要求。(2)向家坝水电站建成后,引起下游水位的陡涨陡落会对整治建筑物上挑丁坝和下挑丁坝造成影响。整治建筑物上下丁坝特别是丁坝的头部易遭到损坏,应对丁坝坝头采取加固措施或优化其结构设计。(3)通过对向家坝电站建成运行后的泸州河段河床变形与冲淤进行计算分析,结果显示泸州河段的河床变形与冲淤变化不大,不会对船舶的通航造成影响。(4)选取了300t、500t、800t、1000t级4种机动船作为典型船型,计算了向家坝电站日调节和泄洪时4种机动船的船舶阻力与船舶推力。计算结果表明,向家坝电站日调节和泄洪时,船舶推力大于船舶阻力,船舶基本能正常上行。但是在向家坝泄洪流量大于12600m3/s(沱江支流流量为300m3/s)时,上行船舶应注意调整航行时间避开最大流速的出现时间段。(5)在新的水沙条件下,船舶仍按当前航法航行,船舶航路不发生改变。结合泸州港汇合口航道情况,提出长江泸州金钟碛滩险河段航标配布的建议。(6)在新的水沙条件下,需要通过加强航道探测、密切关注水位变化。加强对泸州河段的航道测量以及整治建筑物整体稳定性监测,建立长期联系协调机制、强化对超吃水船舶的管理从而提升对航道的维护。
[Abstract]:Navigation of many rivers in China is affected not only by the variation of water level in dry season and flood season, but also by other factors, especially hydropower stations built in the upper reaches of river course.Xiangjiaba Hydropower Station is the last stage of the four giant hydropower stations in the cascade development of the Jinsha River. It is a super large water conservancy project with the main purpose of generating electricity, as well as the comprehensive functions of blocking sand, improving navigation, flood control, irrigation and so on.It is of great significance to study the influence of unsteady flow of Xiangjiaba Hydropower Station on navigation conditions in Luzhou reach of the Yangtze River to ensure navigation safety and avoid waterway accidents.In this paper, the hydrodynamic model and sediment model are established by using HD and St modules in MIKE21 software, based on the research project of channel regulation technology of confluence channel in the upper reaches of the Yangtze River, based on the theories of computational fluid dynamics and sediment movement mechanics.The flow and sediment characteristics of Luzhou reach under natural conditions and Xiangjiaba power station operation are simulated, and the influence of Xiangjiaba hydropower station on navigation conditions of Luzhou reach is analyzed.The suggestion of navigation mark arrangement in the new water and sediment condition is put forward. The main conclusions are as follows: 1) under the operation of Xiangjiaba Hydropower Station, through the analysis of the water surface line, velocity and power axis of water flow in Luzhou reach,Although the flow conditions of Luzhou reach changed after Xiangjiaba Hydropower Station came into operation, it will not affect the navigation of ships. After the completion of Xiangjiaba Hydropower Station, the waterway conditions of Luzhou reach meet the navigation requirements of Grade 鈪，

本文编号：1773392