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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50196

Title: Mapping fracture flow paths with a nanoscale zero-valent iron tracer test and a flowmeter test
Authors: Po-Yu Chuang
Yeeping Chia
Yung-Chia Chiu
Mao-Hua Teng
Sofia Ya Hsuan Liou
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Keywords: Fractured rocks
Nanoscale zero-valent iron
Tracer tests
Flow paths
Date: 2018-02
Issue Date: 2018-09-20T03:27:11Z
Publisher: Hydrogeology Journal
Abstract: Abstract: The detection of preferential flow paths and the characterization of their hydraulic properties are important for the development of hydrogeological conceptual models in fractured-rock aquifers. In this study, nanoscale zero-valent iron (nZVI) particles were used as tracers to characterize fracture connectivity between two boreholes in fractured rock. A magnet array was installed vertically in the observation well to attract arriving nZVI particles and identify the location of the incoming tracer. Heat-pulse flowmeter tests were conducted to delineate the permeable fractures in the two wells for the design of the tracer test. The nZVI slurry was released in the screened injection well. The arrival of the slurry in the observation well was detected by an increase in electrical conductivity, while the depth of the connected fracture was identified by the distribution of nZVI particles attracted to the magnet array. The position where the maximum weight of attracted nZVI particles was observed coincides with the depth of a permeable fracture zone delineated by the heat-pulse flowmeter. In addition, a saline tracer test produced comparable results with the nZVI tracer test. Numerical simulation was performed using MODFLOW with MT3DMS to estimate the hydraulic properties of the connected fracture zones between the two wells. The study results indicate that the nZVI particle could be a promising tracer for the characterization of flow paths in fractured rock.
Relation: 26(1) pp.321–331
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50196
Appears in Collections:[應用地球科學研究所] 期刊論文

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