The influence of density difference, discharge ratio and wind on the mixing at large river confluence

IF 2.4 3区环境科学与生态学 Q2 ENGINEERING, CIVIL

Journal of Hydro-environment Research Pub Date : 2024-06-29 DOI:10.1016/j.jher.2024.06.001

Minjae Lee , Yong Sung Park , Joo Suk Ko , Suhyeok Choi , Siwan Lyu , Byunguk Kim

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Abstract

Numerical simulations for a large river confluence were conducted to comprehend the influences of three factors: density difference, discharge ratio, and wind shear on tributary flow dispersion. The present study focused on the confluence channel of the Nakdong River and the Yangsan Stream in South Korea, with simulation conditions selected based on realistic conditions. Numerical results revealed that tributary flow can disperse upstream under high discharge ratio conditions, which becomes stronger with density stratification. In particular, when the tributary flow is denser than the mainstream, bathymetry around the junction determines the flowing direction of the density current. Thus, understanding tributary flow dispersion under varying conditions is vital due to its influence not only downstream but also upstream of the confluence. Additionally, wind shear impact on the mixing between mainstream and tributary flow is notable but less significant than density difference or discharge ratio.

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密度差、排流比和风力对大河汇流处混合的影响

为了解密度差、排流比和风切变三个因素对支流水流扩散的影响，对大型河流汇流处进行了数值模拟。本研究以韩国洛东江和梁山川的汇流河道为研究对象，模拟条件根据实际情况选择。数值结果表明，在高排流比条件下，支流会向上游发散，密度分层会使发散更强。特别是，当支流的密度高于主流时，交界处周围的水深决定了密度流的流动方向。因此，了解支流在不同条件下的分散情况至关重要，因为它不仅会影响下游，还会影响汇合点上游。此外，风切变对主流和支流之间的混合也有显著影响，但不如密度差或排水比重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES

CiteScore

5.80

自引率

0.00%

发文量

审稿时长

98 days

期刊介绍： The journal aims to provide an international platform for the dissemination of research and engineering applications related to water and hydraulic problems in the Asia-Pacific region. The journal provides a wide distribution at affordable subscription rate, as well as a rapid reviewing and publication time. The journal particularly encourages papers from young researchers. Papers that require extensive language editing, qualify for editorial assistance with American Journal Experts, a Language Editing Company that Elsevier recommends. Authors submitting to this journal are entitled to a 10% discount.