Analytical Solutions of Vertical Airflow in an Unconfined Aquifer with Rising or Falling Water Table

doi:10.3390/w13050625

	Analytical Solutions of Vertical Airflow in an Unconfined Aquifer with Rising or Falling Water Table
	An, Ran 1; Dong, Pei 2; Wang, Jun-Zhi 3; Zhang, Yifan 4; Song, Xianfang 1; Wan, Li 5; Wang, Xu-Sheng 5
刊名	WATER
	2021-03-01
卷号	13 期号:5 页码:13
关键词	vadose zone vertical airflow low-permeability analytical solution dynamics
DOI	10.3390/w13050625
通讯作者	An, Ran(anran1987126@126.com) ; Dong, Pei(dongpei1985@126.com)
英文摘要	The rise and fall of the groundwater level can drive air flow in the vadose zone. In turn, the air flow can interact with the water flow. When the unconfined aquifer is covered by a low-permeability media, the coupling of the water flow and the air flow is more obvious. In this study, a conceptual model is established for coupling of air flow and water flow in the vadose zone in response to rapid fluctuations of the water table. Water injection and drainage experiments are conducted in a double-layered sand column with a thick layer (80.5 cm) of coarse sand and a thin layer of fine sand as a low-permeability cap. Different cap thickness (2 cm, 5 cm, 7.5 cm) and different thickness of the vadose zone (30 cm, 40 cm) are set for the experiments. Negative pressure (NP)/positive pressure (PP) of the air in the vadose zone is observed in the drainage/injection experiments, with higher pressure in experiments of thicker cap layer. In each experiment, NP or PP increases rapidly to reach a maximum in the early stage, and gradually becomes zero in the late stage. Analytical solutions on three subdivided stages indicate the permeability and thickness of the cap layer, as well as permeability and porosity of the media in the vadose zone are the key controlling factors on the process of coupling of air flow and water flow. The solutions also reveal the formation mechanism of air pressure in the vadose zone with a low-permeability cap. This study has both theoretical significance and engineering applications.
资助项目	National Natural Science Foundation of China[41730749]
WOS关键词	HETEROGENEOUS POROUS-MEDIA ; 2-PHASE FLOW ; IMMISCIBLE FLUIDS ; DRAINAGE ; COLUMN ; SIMULATION ; TRANSPORT ; EQUATION ; MODELS
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
语种	英语
出版者	MDPI
WOS记录号	WOS:000628577100001
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/162036]
专题	中国科学院地理科学与资源研究所
通讯作者	An, Ran; Dong, Pei
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 2.Beijing Inst Hydrogeol & Engn Geol, Beijing 100195, Peoples R China 3.Yellow River Engn Consulting Co Ltd YREC, Zhengzhou 450003, Peoples R China 4.China Univ Geosci, Sch Earth Sci & Resources, 29 Xueyuan Rd, Beijing 100083, Peoples R China 5.China Univ Geosci, Key Lab Groundwater Circulat & Evolut, Minist Educ, 29 Xueyuan Rd, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	An, Ran,Dong, Pei,Wang, Jun-Zhi,et al. Analytical Solutions of Vertical Airflow in an Unconfined Aquifer with Rising or Falling Water Table[J]. WATER,2021,13(5):13.
APA	An, Ran.,Dong, Pei.,Wang, Jun-Zhi.,Zhang, Yifan.,Song, Xianfang.,...&Wang, Xu-Sheng.(2021).Analytical Solutions of Vertical Airflow in an Unconfined Aquifer with Rising or Falling Water Table.WATER,13(5),13.
MLA	An, Ran,et al."Analytical Solutions of Vertical Airflow in an Unconfined Aquifer with Rising or Falling Water Table".WATER 13.5(2021):13.