| 摘要: |
| 河流交汇区在流域系统治理中发挥着控制节点作用,为探究中国西北地区典型的Y型天然河流交汇区——湟水与黄河交汇区的水动力特性,本文构建交汇区紊动水流二维水动力数学模型进行了数值模拟研究。结果表明：湟水与黄河交汇区存在典型的高流速区,且其位置和大小与汇流比有关。交汇区在各水文条件下均未形成明显的水流分离区。受干流顶托影响,支流入汇口左右岸会出现反方向回流区,沿水流方向呈翼状贴合壁面分布,其形态随汇流比发生变化。交汇区水流紊动能较大的区域分布在水流剪切层和下游右岸,在各水文时期,随着汇流比增大,剪切层紊动能减小,随着干流流速增大,交汇区下游右岸紊动能增大。本研究可为该交汇区及下游的河道治理、水环境保护以及防洪度汛等提供理论基础,对黄河流域生态保护和高质量发展的国家战略具有一定参考价值。 |
| 关键词: 河流交汇区 数值模拟 汇流比 湟水 黄河 |
| DOI： |
| 分类号:TV14 |
| 基金项目:国家自然科学基金(52109101)；陕西省重点研发计划项目(2022SF-443)；四川大学水力学与山区河流工程国家重点实验室开放基金(SKHL2212)；中国博士后科学基金(2019M653762)；西北农林科技大学2022年大学生创新创业训练计划项目(S202210712622) |
|
| Hydrodynamic Characteristics at the Confluence of Huangshui River and Yellow River |
|
Liu Xiaoyan1,2, Wang Kai1,2, Shen xia1,2, Wei Zichun3, Li Sheng1,2, Yang Tianxiao1,4,2
|
|
1.College of Water Resources and Architectural Engineering, Northwest A&2.F University;3.Yangtze River Conservancy Commission, Hydrographic Bureau;4.amp
|
| Abstract: |
| River confluence plays an important role for controlling nodes in the management of river basin system. In this study, a 2D hydrodynamic mathematical model of turbulent flow was constructed on the confluence between the Huangshui River and Yellow River to explore the hydrodynamic characteristics of this typical Y-shaped river confluence in Northwest China. The results show that the confluence of Huangshui River and Yellow River has a typical high velocity area, and its location and size are related to the flow ratio.There is no obvious water flow separation area formed in the confluence under each hydrological case. Due to the influence of the support of the main stream, there is a flowback area on the left and right banks of the tributary inlet, which is distributed along the flow direction in a wing shape against the wall, and its shape changes with the flow ratio. The turbulent energy in the confluence is distributed in the shear layer and the downstream right bank, with the increase of the flow ratio, the turbulent energy in the shear layer decreases, and with the increase of the main flow velocity, the turbulent energy in the downstream right bank of the confluence increases. This study can provide a theoretical basis for river management, water environmental protection and flood control in the river confluence and downstream, and has some reference value for the national strategy of ecological protection and high-quality development in the Yellow River basin. |
| Key words: river confluence numerical simulation flow ratio Huangshui River Yellow River |
