干旱区生态环境知识资源中心(Arid): Numerical Evaluation of Unsaturated- Zone Flow and Transport Pathways at Rainier Mesa, Nevada

Arid

DOI	10.2136/vzj2019.01.0005
	Numerical Evaluation of Unsaturated- Zone Flow and Transport Pathways at Rainier Mesa, Nevada
	Kwicklis, Edward; Lu, Zhiming; Middleton, Richard; Miller, Terry; Bourret, Suzanne; Birdsell, Kay
通讯作者	Kwicklis, Edward
来源期刊	VADOSE ZONE JOURNAL
ISSN	1539-1663
出版年	2019
卷号	18 期号:1
英文摘要	Sixty one underground nuclear tests were conducted at Rainier Mesa at the Nevada National Security Site between 1957 and 1992. The mesa includes the highest-elevation areas at the Nevada National Security Site and experiences some of the highest estimated infiltration rates. Perched water is ubiquitous in many of the tunnels used for testing. The presence of sloping layers with strongly varying degrees of fracturing and overall permeability suggests that some infiltrating water may be diverted laterally along higher-permeability layers, thereby reducing overall percolation flux and radionuclide transport through the low-permeability testing horizons but also potentially transporting radionuclides laterally away from the test locations. A high-resolution, two-dimensional, cross-sectional model was created to simulate water and particle movement along potential lateral flow paths and to investigate flow and transport paths within and surrounding the perched water bodies. The model results indicate that particles with starting locations within the low-permeability perching layers will follow dominantly vertical trajectories through the perching horizons and reach the water table in the underlying carbonate aquifer only after many thousands of years. In contrast, particles starting near ground surface above the testing horizon are mostly diverted laterally before reaching the testing horizon, except where nearby faults through the perching layers are present. Where the rock above the perching horizon is fractured, particles originating near ground surface can move laterally with relatively high transport velocities. Transport calculations for H-3 show that transport extent is limited by slow matrix flow, radioactive decay, and matrix diffusion in the fractured units.
类型	Article
语种	英语
国家	USA
开放获取类型	Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000480304300001
WOS关键词	RECHARGE RATE ESTIMATION ; PERCHED WATER BODIES ; YUCCA MOUNTAIN ; HYDRAULIC CONDUCTIVITY ; HYDROLOGIC CONSTRAINTS ; ARID ENVIRONMENTS ; SPATIAL MOMENTS ; MODEL ; BENEATH ; SAND
WOS类目	Environmental Sciences ; Soil Science ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219151
作者单位	Los Alamos Natl Lab, Computat Earth Sci Grp EES 16, MS T003, Los Alamos, NM 87545 USA
推荐引用方式 GB/T 7714	Kwicklis, Edward,Lu, Zhiming,Middleton, Richard,et al. Numerical Evaluation of Unsaturated- Zone Flow and Transport Pathways at Rainier Mesa, Nevada[J],2019,18(1).
APA	Kwicklis, Edward,Lu, Zhiming,Middleton, Richard,Miller, Terry,Bourret, Suzanne,&Birdsell, Kay.(2019).Numerical Evaluation of Unsaturated- Zone Flow and Transport Pathways at Rainier Mesa, Nevada.VADOSE ZONE JOURNAL,18(1).
MLA	Kwicklis, Edward,et al."Numerical Evaluation of Unsaturated- Zone Flow and Transport Pathways at Rainier Mesa, Nevada".VADOSE ZONE JOURNAL 18.1(2019).