大樟溪入汇对乌龙江洪水水动力影响研究  

Study on the influence of Dazhangxi River on the hydrodynamic characteristics of Wulongjiang River floods

作　　者：胡朝阳[1,2] 王新强 许立[1,2] 梁越 夏厚兴 HU Zhaoyang;WANG Xinqiang;XU Li;LIANG Yue;XIA Houxing(Fujian Provincial Investigation,Design&Research Institute of Water Conservancy&Hydropower,Fuzhou 350001,Fujian,China;Fujian Hydraulics Research Center,Fuzhou 350001,Fujian,China)

机构地区：[1]福建省水利水电勘测设计研究院,福建福州350001 [2]福建省水工程水动力研究中心,福建福州350001

出　　处：《水利水电技术》2020年第3期73-81,共9页Water Resources and Hydropower Engineering

基　　金：福建省水利科技项目“闽江下游水动力和河床演变与城市水安全研究”。

摘　　要：为研究大樟溪入汇对乌龙江洪水水动力的影响,采用二维数学模型计算分析了不同洪水工况下乌龙江河道流量、水位及流速分布特征。结果表明:50 a、100 a、200 a一遇工况下,乌龙江流量分别减少125 m 3/s、167 m 3/s、190 m 3/s,相应分流比减少0.38%、0.47%、0.50%;乌龙江进口至峡兜河段洪水位壅高幅度分别为0.10~0.28 m、0.10~0.35 m、0.10~0.42 m,大樟溪入汇对入汇口上游乌龙江河道水位的影响更大;入汇口上游河段流速减小幅度基本在0.10 m/s以下,其中由支干流水流相冲引发的水体滞留区流速最大分别减小0.26 m/s、0.26 m/s、0.31 m/s,入汇口下游左侧主河槽部分流速增幅基本在0.10 m/s以上、右侧支汊除上段流速增幅达0.10 m/s以上以外其余区域流速增幅均小于0.10 m/s,入汇口下游近右岸侧回流区流速最大分别减小0.20 m/s、0.20 m/s、0.20 m/s,大樟溪入汇对入汇口下游乌龙江河道流速的影响更大。In order to study the influence of inflow of Dazhangxi river on the hydrodynamic characteristics of the Wulongjiang river flood,a 2-D mathematical model is used to calculate and analyze the flow rate,water level and velocity distribution characteristics of the Wulongjiang river under different flood conditions.The results show that under the condition of 50-year flood,100-year flood and 200-year flood,the flow of Wulongjiang river is reduced by 125 m 3/s,167 m 3/s and 190 m 3/s,the corresponding split ratio is reduced by 0.38%,0.47%,and 0.50%,and the Backwater height from the Wulongjiang river inlet to Xiadou is 0.10~0.28 m,0.10~0.35 m and 0.10~0.42 m.Obviously,the inflow of Dazhangxi River has a greater influence on the water level of the upstream of the confluence.The decrease of the upstream velocity of the confluence is basically below 0.10 m/s,and the maximum flow velocity in the water retention area caused by interaction between tributaries and main streams decreases by 0.26 m/s,0.26 m/s and 0.31 m/s respectively.The velocity increase of the main channel on the left side of the downstream of confluence is basically above 0.10 m/s.And except for the upper branch of the right branch,the increase of flow velocity in other areas is less than 0.10 m/s.The maximum flow velocity in the backflow area near the right bank downstream of the confluence decreases by 0.20 m/s,0.20 m/s and 0.20 m/s,respectively.So the inflow of Dazhangxi river has a greater influence on the velocity of the downstream of the confluence.

关 键 词：大樟溪 乌龙江 洪水 水动力 数值模拟 支流入汇 

分 类 号：TV143[水利工程—水力学及河流动力学]