Greenhouse gas emission rate under discharge condition by numerical simulation

被引：0
|
作者：
Huang J. [1 ,2 ]
Ou Y. [3 ]
Li R. [2 ]
Feng J. [2 ]
Li Z. [1 ]
机构：
[1] Chongqing Institute of Green and Intelligence Technology, Chinese Academy of Sciences, Chongqing
[2] State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu
[3] College of Architecture and Civil Engineering, Chengdu University, Chengdu
来源：
Hupo Kexue/Journal of Lake Sciences | 2022年 / 34卷 / 02期
关键词：
Discharge through dam; Emission rate; Greenhouse gas; Numerical simulation;
D O I：
10.18307/2022.0225
中图分类号：
学科分类号：
摘要：
The solubility of dissolved greenhouse gas (GHG), such as carbon dioxide (CO2) and methane (CH4) in water will be decreased under discharge conditions due to the sudden change of pressure, which will lead to gas-liquid mass transfer and GHG emission. However, the research about GHG emission under flood discharge conditions is still rare. Considering the limitation of prototype observation and model experiment, a mathematical model for GHG emission rate under flood discharge conditions was built in this paper. The model is based on the VOF (volume of fluid) method and takes into account the bubble mass transfer and free surface mass transfer. We simulated the transport and diffusion of dissolved CO2 and CH4 in the spillway and jet flow respectively, and calculated their concentration distribution and emission rate. The simulated results show that the concentration distribution of GHG downstream of the dam is mainly affected by the upstream inflow concentration, gas-liquid mass transfer, the transport and diffusion of dissolved GHG. Among them, the concentration of GHG in the upstream flow is the main factor affecting the emission rate downstream of the dam. This study provides a new research approach and technical base for clarifying the amount of GHG emission rate under different discharge types, and scientifically evaluating the hydroelectric carbon footprint. © 2022 by Journal of Lake Sciences.
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页码：664 / 674
页数：10
相关论文
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