90°等宽明渠交汇水流污染物混合规律数值模拟  

Numerical simulation on pollutant mixing law at a 90° open-channel confluence of equal width

作　　者：毛颂平 朱海[1] 王玲玲[1] 华祖林[2] 陆圣杰 薛晓鹏 MAO Songping;ZHU Hai;WANG Lingling;HUA Zulin;LU Shengjie;XUE Xiaopeng(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;College of Environment,Hohai University,Nanjing 210098,China;Ningbo Water Conservancy and Hydropower Planning and Design Institute Co.,Ltd.,Ningbo 315192,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]河海大学环境学院,江苏南京210098 [3]宁波市水利水电规划设计研究院有限公司,浙江宁波315192

出　　处：《水利水电科技进展》2022年第3期64-69,96,共7页Advances in Science and Technology of Water Resources

基　　金：国家重点研发计划(2021YFC3200403);国家自然科学基金(51879086);浙江省水利厅科技项目(RB1925)。

摘　　要：为研究明渠交汇水流污染物混合规律,针对90°等宽顺直明渠水流交汇口,建立三维水动力污染物耦合输运数学模型,对6种不同汇流比情况进行数值模拟研究。计算结果表明:交汇水流污染物分布存在明显的三维特征,且与二次流密切相关;水体表层污染带最大宽度与汇流比的关系和水体内部不同,表层水体污染带最大宽度在小汇流比工况下为主渠宽度,不随汇流比的变化而改变,在大汇流比工况下与汇流比呈良好的一次函数关系;中下层水体污染带最大宽度与汇流比呈二次曲线关系;汇流比越接近0.5,污染物混合越不均匀,且汇流比越大,污染物混合速率越快。In order to study the mixing rule of pollutant at a flow confluence of open channel,a 90°open-channel confluence of equal width was chosen as the study area.A three-dimensional hydrodynamic-pollutant coupling transport mathematical model was established and validated.The simulation was performed for six cases of different flux ratios.The results indicate that,the distribution of pollutant at the flow confluence shows obvious three-dimensional characteristics,which is closely related to the secondary flow.The relation between the maximum width of the polluted zone and the flux ratio on the surface of water is different from that in the interior of water body.The maximum width of the polluted zone of the water surface is equal to the width of main channel under low flux ratio cases and does not change with the flux ratios.However,it presents a good linear function relation with the flux ratio under high flux ratio cases.The relation between the maximum width of the polluted zone and flux ratio is quadratic in the middle and bottom water.The mixing of pollutant is less uniform if the flux ratio is closer to 0.5.The mixing rate of pollutant is faster if the flux ratio is higher.

关 键 词：明渠 交汇水流 污染物 汇流比 数值模拟 

分 类 号：TV133[水利工程—水力学及河流动力学]