顺直分汊河段枢纽施工及运行初期河床变形规律分析
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摘要
针对顺直分汊河段坝下河床在枢纽运行初期河床变形剧烈影响通航的问题,本文以沅水末级梯级桃源枢纽为例,在搜集施工期及运行初期水文资料、遥感图像以及实测地形资料的基础上,进行了河床演变分析。分析结果表明,坝下河床粗化后以推移质运动为主,且河床粗化始于枢纽施工期;运行期同期来流空间分布变化、施工导流束窄或封堵支汊、无序人工采砂对坝下河床重塑有较大影响,其中施工导流、人工采砂对河床的影响随机性较强,可预测难度较大。
Aiming at solving the problem that the river bed in the dam downstream of the straight branching reach is deformed severely in the initial stage of the operation of the project,which affects navigation,this paper takes the last cascade Taoyuan Project of Yuanshui as an example to analyze the river bed evolution on the basis of collecting hydrological data,remote sensing images and topographic data during the construction period and the initial operation stage. The analysis results showed that the bed coarsening under the dam was dominated by bed load movement,and the bed coarsening began during the construction period of the project. During the same period of operation,the variation of spatial distribution of incoming flow,narrow construction diversion bundle,blocking branch and disorderly artificial sand mining had great influence on the remodeling of river bed under dam. Among them,the influence of construction diversion and artificial sand mining on river bed was very random,and difficult to predict.
Aiming at solving the problem that the river bed in the dam downstream of the straight branching reach is deformed severely in the initial stage of the operation of the project,which affects navigation,this paper takes the last cascade Taoyuan Project of Yuanshui as an example to analyze the river bed evolution on the basis of collecting hydrological data,remote sensing images and topographic data during the construction period and the initial operation stage. The analysis results showed that the bed coarsening under the dam was dominated by bed load movement,and the bed coarsening began during the construction period of the project. During the same period of operation,the variation of spatial distribution of incoming flow,narrow construction diversion bundle,blocking branch and disorderly artificial sand mining had great influence on the remodeling of river bed under dam. Among them,the influence of construction diversion and artificial sand mining on river bed was very random,and difficult to predict.
引文
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[2]李思维,乔富斌.河流演变规律的实验研究[J].水资源与水工程学报,2012,23(6):132-136.
[3]王培道,张根广.潼关以下库区冲淤机理分析[J].水资源与水工程学报,2007,18(6):62-64.
[4]王毓莹.基于泄洪移民区域分汊河道泄流相互影响的模型试验研究[J].水资源与水工程学报,2017,28(3):139-145.
[5]李向阳,许立祥,解赞琪,等. 2014年汛期小浪底库区异重流演进规律分析[J].水资源与水工程学报,2017,28(6):163-167.
[6]毕银霞,王相印.北洛河改道入黄对黄、渭、洛河汇流区影响分析[J].水资源与水工程学报,2008,19(3):79-83.
[7]李红.长江中下游典型弯曲分汊河道水力特性研究[D].重庆:重庆交通大学,2008.
[8]安梦雄.渭南尤河水库冲淤规律的分析[J].水资源与水工程学报,1992,3(4):83-88.
[9]石长伟,张英,梁林江,等.渭河下游近期冲淤变化及其原因分析[J].水资源与水工程学报,2018,29(1):134-137+143.
[10]郝品正,李军,徐国兵.微弯分汊河段航电枢纽总体布置与通航条件优化试验研究[J].水运工程,2004(11):66-69.
[11]朱玉德,华奋飞,刘鹏飞.长江中下游顺直放宽和弯曲分汊连接段河道特征及治理思路[J].水运工程,2013(4):142-145.
[12]虞东亮.桃源水电站施工导流及临时通航方案研究[J].水利水电工程设计,2011,30(1):4-8+56.
[13]杨正广,傅光正.桃源水电站工程建设期洪水风险管控[J].水力发电,2014,40(6):5-8.
[14]虞东亮,陈钰,周洁,等.桃源水电站施工导流设计与实践[J].水力发电,2014,40(6):30-34+41.
[15]奉伟清,崔金虎,王红斌,等.桃源水电站枢纽布置方案设计综述[J].水力发电,2014,40(6):25-29.