深溪沟与白沙河交汇区水流运动3维数值模拟
3D Numerical Simulation of Flow Characteristics at Confluence Zone Between Shenxigou Stream and Baisha River
作者：高永胜(浙江同济科技职业学院，浙江 杭州 311231)；叶龙(浙江省水利河口研究院，浙江 杭州 310020)；王以逵(四川大学 水力学与山区河流开发保护国家重点实验室，四川 成都 610065)；许泽星(四川大学 水力学与山区河流开发保护国家重点实验室，四川 成都 610065)；王协康(四川大学 水力学与山区河流开发保护国家重点实验室，四川 成都 610065)
Author：GAO Yongsheng(Zhejiang Tongji Vocational College of Sci. and Technol., Hangzhou 311231, China)；YE Long(Zhejiang Inst. of Hydraulics & Estuary, Hangzhou 310020, China)；WANG Yikui(State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ., Chengdu 610065, China)；XU Zexing(State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ., Chengdu 610065, China)；WANG Xiekang(State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ., Chengdu 610065, China)
收稿日期：2019-05-07 年卷（期）页码：2020,52(2):78-85
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：河流交汇;物理模型;数值模拟;水流结构;分离区
Key words：river confluence;physical model;numerical simulation;flow structure;separation zone
基金项目：国家重点研发计划项目（2019YFC0408800）；国家自然科学基金项目（41771543；51579163）
中文摘要
河流交汇区干支来流的混掺作用，致使该区域水流结构呈现显著的3维特征。基于都江堰深溪沟与白沙河交汇河段的物理模型资料，利用3维数值模拟技术，探讨了深溪沟与白沙河交汇区的水流结构特性。结果表明：干流汇口处断面的水面线在入汇右侧出现突变，下游附近水面线呈现左岸高于右岸的趋势；支流流量越大，交汇区下游断面的流速就越大，水位就越低；无论支流是否来流，在交汇区入汇下游右岸附近都会形成不同范围的水流分离区，各流量组合条件的分离区顶端形状变化明显，且分离区的几何尺寸参数随水位高程的降低而减小。
英文摘要
The flow structure appears of obviously three dimensional property resulting from flow interactions between main river and tributary river. The confluence of Shenxigou Stream and Baisha River in Dujiangyan region has the complex bathymetry, and the confluence reaches have a strong three-dimensional flow characteristics. Numerical simulation of turbulent water and gas flow was conducted for the flow structure of main stream and tributary stream based on the physical model data. The results showed that water line changed rapidly on the right side at the position of the confluence. The water surface of the right bank downstream was lower than that of the left bank. The larger the tributaries flow is, the larger the flow velocity at the downstream of confluence zone, and the lower the water level. The vicinity of the confluence section did not show significant secondary flow. The left side of the river bend downstream formed a secondary flow counterclockwise, occupying two-thirds of the cross-section. The secondary flow had obvious impact on sediment motion of the river bed. Whether there is a tributary flow or not, a diverse range of separation zone would be formed near the right bank downstream of the confluence, and the top shape of the separation zone would change significantly. The size parameters of the separation zone would be lower with the increase of water level elevation.
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