成层非饱和覆盖层中气水两相扩散模型

关驰; 谢海建; 楼章华

doi:10.6052/0459-1879-12-313

成层非饱和覆盖层中气水两相扩散模型

doi: 10.6052/0459-1879-12-313

1.
浙江大学建筑工程学院水文与水资源工程研究所,杭州310058
2. 浙江大学海洋科学与工程学系,杭州310058

基金项目: 国家自然科学基金(51278452,51008274),浙江省公益性技术应用研究计划(2011C21061)和国家重点基础研究发展计划(2012CB719806)资助项目.

详细信息

通讯作者:
谢海建,副教授,研究方向:环境土工和多相流.E-mail:xiehaijian@zju.edu.cn

中图分类号: TU43
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- 被引次数: 0
出版历程
- 收稿日期: 2012-11-08
- 修回日期: 2012-12-10
- 刊出日期: 2013-03-18

GAS-WATER TWO-PHASE DIFFUSION MODEL FOR UNSATURATED LAYERED COVER SYSTEMS

1.
Institute of Hydrology and Water Resources Engineering, Zhejiang University, Hangzhou 310058, China
2. Department of Ocean Science and Engineering, Zhejiang University, Hangzhou 310058, China

Funds: The project was supported by the National Natural Science Foundation of China (51278452, 51008274), Zhejiang Provincial Public Industry Research Projects (2011C21061) and the National Basic Research Program (2012CB719806).

摘要

摘要: 为了研究垃圾填埋场内部生物降解产生的气体(以甲烷为主) 和氧气等在非饱和覆盖层中的运移规律,建立了气体在成层非饱和覆盖层中的一维扩散模型. 该模型考虑了覆盖层含水量瞬态变化和气体扩散的耦合作用. 采用有限元多物理场耦合分析软件COMSOL Multiphysics 4.3进行求解. 其计算结果与前人实验结果能符合得很好. 研究结果表明,对典型垃圾填埋场中厚度为1m的非饱和黏土覆盖层,含水量变化对覆盖层中气体污染物的扩散运移有显著影响. 与含水量稳态变化情况相比,20 d到100 d的运移时间内同一覆盖层深度处耦合含水量作用下,气体相对浓度可以相差接近8倍. 含水量是气体在非饱和覆盖层中不稳定运移的重要影响因素.
- 气体 /
- 扩散 /
- 非饱和 /
- 填埋场覆盖层 /
- 两相流 /
- 耦合模型
Abstract: A one-dimensional diffusion model of gas is developed to investigate landfill gas transport in unsaturated layered cover systems. Coupled processes of gas diffusion in the unsaturated cover and transient water transport in the media were considered. The mathematical model was solved by using the finite element analysis software COMSOL Multiphysics 4.3. The results obtained by the proposed model agree well with those obtained by the experimental methods. It is shown that the variation of water content has great influence on landfill gas transport in a 1-meter-thickness unsaturated landfill cover soil. For the 1-meter-thcikness unsaturated cover soil, the relative gas concentrations for the case assuming coupled transport was approximately 8 times smaller than those assuming steady transport at the time range of 20 d to 100 d. It is indicated that the water content is of great importance when predicting the unsteady gas migration in unsaturated landfill cover systems.
- gas /
- diffusion /
- unsaturated /
- landfill cover system /
- two-phase flow /
- coupled model

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