Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028760 |
Factors influencing distribution characteristics of total dissolved gas supersaturation at confluences | |
X. Shen; B. R. Hodges; R. Li; Z. Li; J. L. Fan; N. B. Cui; H. J. Cai | |
2021-06-11 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Total dissolved gas supersaturation (TDGS) produced by flood flows over a high dam has negative consequences on downstream fish. Reducing the TDG levels and/or providing adequate low-TDGS fish shelter areas remains a challenge. The presence of a low-TDG-saturation (LTS) zone at river confluences can protect the fish from harmful high TDG levels, but the effects of confluence hydrodynamics on the TDGS distribution are not well understood. In this study, three-dimensional (3D) hydrodynamic simulations are performed to understand the influence of flow ratio and junction angle on the TDGS distribution downstream of river confluences. The simulation results show that the TDGS distribution is mainly affected by (i) inflow TDGS that determines the supply, (ii) secondary flow that leads to rapid renewal of surface water for degassing, and (iii) increased turbulence intensity that promotes dissipation of TDGS. Relationship between the LTS area, the flow ratio and the junction angle are constructed via regression analysis. The regression model is validated against a 3D numerical simulation that is compared to field observations at two river confluences along the Jinshajiang River (China). This study provides scientific basis for potential hydraulic modifications at confluences to enlarge LTS zone and reduce fish fatality. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/329754 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | X. Shen,B. R. Hodges,R. Li,et al. Factors influencing distribution characteristics of total dissolved gas supersaturation at confluences[J]. Water Resources Research,2021. |
APA | X. Shen.,B. R. Hodges.,R. Li.,Z. Li.,J. L. Fan.,...&H. J. Cai.(2021).Factors influencing distribution characteristics of total dissolved gas supersaturation at confluences.Water Resources Research. |
MLA | X. Shen,et al."Factors influencing distribution characteristics of total dissolved gas supersaturation at confluences".Water Resources Research (2021). |
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