Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2017WR021681 |
The Influence of Syndepositional Macropores on the Hydraulic Integrity of Thick Alluvial Clay Aquitards | |
Timms, Wendy A.1,2; Acworth, R. Ian2,3; Crane, Richard A.1,4; Arns, Christoph H.5; Arns, Ji-Youn6; McGeeney, Dayna E.2,3; Rau, Gabriel C.2,3; Cuthbert, Mark O.2,7 | |
2018-04-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2018 |
卷号 | 54期号:4页码:3122-3138 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; England; Wales |
英文摘要 | Clay-rich deposits are commonly assumed to be aquitards which act as natural hydraulic barriers due to their low hydraulic connectivity. Postdepositional weathering processes are known to increase the permeability of aquitards in the near surface but not impact on deeper parts of relatively thick formations. However, syndepositional processes affecting the hydraulic properties of aquitards have previously received little attention in the literature. Here, we analyze a 31 m deep sediment core recovered from an inland clay-rich sedimentary sequence using a combination of techniques including particle size distribution and microscopy, centrifuge dye tracer testing and micro X-ray CT imaging. Subaerial deposition of soils within these fine grained alluvial deposits has led to the preservation of considerable macropores (root channels or animal burrows). Connected pores and macropores thus account for vertical hydraulic conductivity (K) of 4.2 x 10(-9) m/s (geometric mean of 13 samples) throughout the thick aquitard, compared to a matrix K that is likely < 10(-10) m/s, the minimum K value that was measured. Our testing demonstrates that such syndepositional features may compromise the hydraulic integrity of what otherwise appears to have the characteristics of a much lower permeability aquitard. Heterogeneity within a clay-rich matrix could also enhance vertical connectivity, as indicated by digital analysis of pore morphology in CT images. We highlight that the paleo-environment under which the sediment was deposited must be considered when aquitards are investigated as potential natural hydraulic barriers and illustrate the value of combining multiple investigation techniques for characterizing clay-rich deposits. |
英文关键词 | aquitard macropore preferential flow permeability |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000434186400034 |
WOS关键词 | NEW-SOUTH-WALES ; PREFERENTIAL FLOW ; SOLUTE TRANSPORT ; LIVERPOOL PLAINS ; ELECTRICAL-RESISTIVITY ; GROUNDWATER RECHARGE ; FRACTURE APERTURE ; TILL ; PERMEABILITY ; AUSTRALIA |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21133 |
专题 | 资源环境科学 |
作者单位 | 1.Univ New South Wales, Sch Min Engn, Sydney, NSW, Australia; 2.Univ New South Wales, Connected Waters Initiat Res Ctr, Sydney, NSW, Australia; 3.Univ New South Wales, Sch Civil & Environm Engn, Water Res Lab, Sydney, NSW, Australia; 4.Univ Exeter, Camborne Sch Mines, Coll Engn Math & Phys Sci, Penryn, England; 5.Univ New South Wales, Sch Petr Engn, Sydney, NSW, Australia; 6.Australian Natl Univ, Res Sch Phys & Engn, Dept Appl Math, Canberra, ACT, Australia; 7.Cardiff Univ, Sch Earth & Ocean Sci, Cardiff, S Glam, Wales |
推荐引用方式 GB/T 7714 | Timms, Wendy A.,Acworth, R. Ian,Crane, Richard A.,et al. The Influence of Syndepositional Macropores on the Hydraulic Integrity of Thick Alluvial Clay Aquitards[J]. WATER RESOURCES RESEARCH,2018,54(4):3122-3138. |
APA | Timms, Wendy A..,Acworth, R. Ian.,Crane, Richard A..,Arns, Christoph H..,Arns, Ji-Youn.,...&Cuthbert, Mark O..(2018).The Influence of Syndepositional Macropores on the Hydraulic Integrity of Thick Alluvial Clay Aquitards.WATER RESOURCES RESEARCH,54(4),3122-3138. |
MLA | Timms, Wendy A.,et al."The Influence of Syndepositional Macropores on the Hydraulic Integrity of Thick Alluvial Clay Aquitards".WATER RESOURCES RESEARCH 54.4(2018):3122-3138. |
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