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A coupled field study of subsurface fracture flow and colloid transport
Zhang, Wei1,2; Tang, Xiang-Yu1; Weisbrod, Noam3; Zhao, Pei1,4; Reid, Brian J.1,5
Corresponding AuthorXiang-Yu Tang
2015
Source PublicationJOURNAL OF HYDROLOGY
ISSN0022-1694
EISSN1879-2707
Volume524Pages:476-488
SubtypeArticle
AbstractField studies of subsurface transport of colloids, which may act as carriers of contaminants, are still rare. This is particularly true for heterogeneous and fractured matrices. To address this knowledge gap, a 30-m long monitoring trench was constructed at the lower end of sloping farmland in central Sichuan, southwest China. During the summer of 2013, high resolution dynamic and temporal fracture flow discharging from the interface between fractured mudrock and impermeable sandstone was obtained at intervals of 5 min (for fast rising stages), 30-60 min (for slow falling stages) or 15 min (at all other times). This discharge was analyzed to elucidate fracture flow and colloid transport in response to rainfall events. Colloid concentrations were observed to increase quickly once rainfall started (-15-90 min) and reached peak values of up to 188 mg/L. Interestingly, maximum colloid concentration occurred prior to the arrival of flow discharge peak (i.e. maximum colloid concentration was observed before saturation of the soil layer). Rainfall intensity (rather than its duration) was noted to be the main factor controlling colloid response and transport. Dissolved organic carbon concentration and 6180 dynamics in combination with soil water potential were used to apportion water sources of fracture flow at different stages. These approaches suggested the main source of the colloids discharged to be associated with the flushing of colloids from the soil mesopores and macropores. Beyond the scientific interest of colloid mobilization and transport at the field scale, these results have important implications for a region of about 160,000 km(2) in southwest China that featured similar hydrogeologic settings as the experimental site. In this agriculture-dominated area, application of pesticides and fertilizers to farmland is prevalent. These results highlight the need to avoid such applications immediately before rainfall events in order to reduce rapid migration to groundwater via fracture flow in either dissolved form or in association with colloids. (C) 2015 Elsevier B.V. All rights reserved.
KeywordColloid Transport Fracture Flow Colloid Response Natural Rainfall
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
DOI10.1016/j.jhydrol.2015.03.001
URL查看原文
WOS Subject ExtendedEngineering ; Geology ; Water Resources
Indexed BySCI
WOS KeywordUNSATURATED POROUS-MEDIA ; AIR-WATER-INTERFACE ; IONIC-STRENGTH ; PARTICLE MOBILIZATION ; DISCRETE FRACTURES ; MACROPOROUS SOILS ; SHALE SAPROLITE ; KARST AQUIFER ; GRAIN-SIZE ; COLUMNS
Language英语
Quartile2区
TOP
WOS SubjectEngineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000354503300038
Funding OrganizationCAS-SAFEA International Partnership Program for Creative Research Team(KZZD-EW-TZ-06) ; Ministry of Science and Technology of China(2012CB417101) ; Chinese Academy of Sciences(2011T1Z27) ; National Natural Science Foundation of China(41171372 ; Chinese Academy of Sciences ; Sichuan Province ; 41471268)
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Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/9183
Collection山区发展研究中心
山地表生过程与生态调控重点实验室
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Ben Gurion Univ Negev, Zuckerberg Inst Water Res, J Blaustein Inst Desert Res, Dept Environm Hydrol & Microbiol, IL-84990 Midreshet Ben Gurion, Israel
4.Shangluo Univ, Shangluo 726000, Peoples R China
5.Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Zhang, Wei,Tang, Xiang-Yu,Weisbrod, Noam,et al. A coupled field study of subsurface fracture flow and colloid transport[J]. JOURNAL OF HYDROLOGY,2015,524:476-488.
APA Zhang, Wei,Tang, Xiang-Yu,Weisbrod, Noam,Zhao, Pei,&Reid, Brian J..(2015).A coupled field study of subsurface fracture flow and colloid transport.JOURNAL OF HYDROLOGY,524,476-488.
MLA Zhang, Wei,et al."A coupled field study of subsurface fracture flow and colloid transport".JOURNAL OF HYDROLOGY 524(2015):476-488.
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