支流冲积平原对汇流水动力的影响

IF 1.7 3区工程技术 Q3 ENGINEERING, CIVIL

Journal of Hydraulic Research Pub Date : 2023-07-04 DOI:10.1080/00221686.2023.2231413

Saiyu Yuan, Guanghui Yan, Hongwu Tang, Yang Xiao, H. Rahimi, Moe Nandar Aye, C. Gualtieri

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引用次数: 0

摘要

汇合处是河网的常见组成部分，具有高度复杂的水流结构。对比研究了支流中无漫滩和有漫滩两种汇流形态，以突出漫滩对汇流水动力的影响。分析了三维速度场、湍流动能和雷诺剪应力的空间分布。在第二个几何形状中，观察到一个倾斜的剪切层，这与水流从主河道向支流扩张有关。显著的二次运动主要与冲积平原背风处的流体上涌、台阶和流线曲率有关。发现了一个较宽的水流分离带，而分离带的长度不受漫滩水流的影响。研究结果有助于理解大流量条件下长江与鄱阳湖大汇合处河漫滩的复杂水动力特性。

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Effects of tributary floodplain on confluence hydrodynamics

Confluences are common components of river networks and are characterized by a highly complex flow structure. Two confluence geometries, without and with the floodplain in the tributary, were comparatively investigated to highlight the effects of floodplain on confluence hydrodynamics. The three-dimensional velocity field and the spatial distribution of turbulent kinetic energy and Reynolds shear stresses were analysed. In the second geometry, a tilted shear layer was observed, which was related to the flow expansion from the main channel into the tributary. Significant secondary motions are mainly related to the fluid upwelling in the lee of the floodplain step and streamline curvature. A wider flow separation zone was found, while the length of the separation zone was not affected by the floodplain flow. The results could be useful to understand the complex hydrodynamics of the large confluence between the Yangtze River and the Poyang Lake, characterized from a floodplain under high flow conditions.

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来源期刊

Journal of Hydraulic Research 工程技术-工程：土木

CiteScore

4.90

自引率

4.30%

发文量

审稿时长

6.6 months

期刊介绍： The Journal of Hydraulic Research (JHR) is the flagship journal of the International Association for Hydro-Environment Engineering and Research (IAHR). It publishes research papers in theoretical, experimental and computational hydraulics and fluid mechanics, particularly relating to rivers, lakes, estuaries, coasts, constructed waterways, and some internal flows such as pipe flows. To reflect current tendencies in water research, outcomes of interdisciplinary hydro-environment studies with a strong fluid mechanical component are especially invited. Although the preference is given to the fundamental issues, the papers focusing on important unconventional or emerging applications of broad interest are also welcome.