| 水流交汇区污染物输移扩散特性 |
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| 引用本文： | 魏娟,李然,康鹏,刘盛赟.水流交汇区污染物输移扩散特性[J].水科学进展,2012,23(6):822-828. |
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| 作者姓名： | 魏娟 李然 康鹏 刘盛赟 |
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| 作者单位： | 1. 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;2. 云南地质工程勘察设计研究院, 云南昆明 650041 |
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| 基金项目： | 国家自然科学基金资助项目(51179111)~~ |
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| 摘 要： | 为分析水流交汇区污染物输移扩散规律,开展了交汇区污染物浓度分布规律的实验和数值模拟研究。建立了交汇区污染物扩散的水气两相流数学模型,并采用实验结果进行验证,对交汇区不同流量、动量和交汇角情况进行实验和数值模拟研究。结果表明:含高浓度污染物的支流汇入干流后,在交汇口下游支流侧形成较长的污染带,且支流与干流的交汇角和流量比(动量比)越小,污染带越狭长;在污染带范围内,污染物浓度梯度较大;污染物分布主要受随流输移和扩散的综合作用影响,其中在交汇区污染物的扩散作用明显。
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| 关 键 词： | 水流交汇区 污染物 输移扩散 数值模拟 |
| 收稿时间： | 2011-12-20 |
Study on transportation and diffusion characteristics of contaminants at flow confluence |
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| WEI Juan,LI Ran,KANG Peng,LIU Sheng-yun.Study on transportation and diffusion characteristics of contaminants at flow confluence[J].Advances in Water Science,2012,23(6):822-828. |
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| Authors: | WEI Juan LI Ran KANG Peng LIU Sheng-yun |
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| Institution: | 1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China;2. Yunnan Institute of Geological Engineering Investigation, Kunming 650041, China |
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| Abstract: | In order to analyze transportation and diffusion characteristics of contaminants at flow confluence, this paper presents the results of a series of experiments that were conducted and the numerical simulation study for probing distribution rules at flow confluence. A two-phase flow model applicable to confluences was established, and it was verified by experimental results. Experiments and numerical simulation were performed for different conditions. The results indicate that: A long and narrow contaminated zone is formed near the tributary side; and, the smaller junction angle and flow ratio (momentum ratio) are narrower with contaminated zone; within the contaminated zone, the gradient of concentration is great; and, contaminants distribution at the confluence is mainly determined by the effects of transportation and diffusion. These study results can provide a scientific basis for environmental evaluation, management and pollution control of river confluence. |
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| Keywords: | flow confluence contaminants transportation and diffusion numerical simulation |
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