摘要
电站日调节非恒定流对下游河道的影响是向家坝工程在运行时需要考虑的主要问题。通过长河段二维非恒定数学模型计算分析向家坝日调节非恒定流对落锅滩河段航道通航水流条件的影响,选取两种典型日调节工况和泄洪工况分析河段内水位、流量、流速等水力因素变化特性。结果表明,两种典型日调节工况下非恒定流传播至落锅滩水位变幅在1. 26~1. 46 m,泄洪工况下水位最大日变幅在2. 05~2. 96 m,非恒定流对河段产生了一定影响,根据目前通航标准来看,4种工况下河段内水力指标均能够达到通航水力指标。建议对坝下非恒定流特征及其对航道、港口码头的影响情况进行原型观测,积累实践经验,为进一步优化电站调度方案和下游航道维护等方面提供依据。
The influence of daily unsteady flow regulation on the downstream channel is the main problem to be considered in the operation of Xiangjiaba Project.Based on the two-dimensional unsteady mathematical model,we analyze the influence of daily unsteady flow of Xiangjiaba on the navigation conditions of the waterway of Luoguotan reach,and select two typical daily regulating conditions and two flood discharge conditions to analyze the variation characteristics of water level,discharge and velocity in the reach of the river.The results show that,under two typical daily regulation conditions,the variation of water level from unsteady flow ship to Luoguotan is from 1.26 m to 1.46 m,and the maximum daily variation of water level under flood discharge condition is from 2.05 m to 2.96 m.The unsteady flow has a certain influence on the reach of the river.According to the current navigation standard,the maximum daily variation of water level is from 2.05 m to 2.96 m.Under four conditions,the hydraulic index of river reach can reach the navigable hydraulic index.The characteristics of unsteady flow under the dam and its influence on the waterway and port wharf should be observed prototype,accumulate practical experience,and provide the basis for further optimization of power station scheduling scheme and downstream waterway maintenance.
作者
张有林
李文杰
张谧
李欢
ZHANG You-lin;LI Wen-jie;ZHANG Mi;LI Huan(Sichuan Communication Surveying&Design Institute,Chengdu 610017,China;National Engineering Research Center for Inland Waterway Regulation,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《水运工程》
北大核心
2018年第11期91-96,共6页
Port & Waterway Engineering
基金
国家重点研发计划项目(2016YFC0402103)
四川省交通运输科技项目(2017B04
2016B26)
关键词
向家坝
日调节
非恒定流
泄洪
落锅滩
通航条件
Xiangjiaba
daily regulation
unsteady flow
flood discharge
Luoguotan
navigation condition