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Detecting Seasonal Flow Pathways in Road Structures Using Tracer Tests and ERT
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Water and Environmental Engineering. Royal Inst Technol KTH, Div Land & Water Resources Engn, S-10044 Stockholm, Sweden.;Koya Univ, Dept Civil Engn, Fac Engn, KOY45, Koya, Kurdistan Regio, Iraq..
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Water and Environmental Engineering. Royal Inst Technol KTH, Div Land & Water Resources Engn, S-10044 Stockholm, Sweden..
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Water and Environmental Engineering. Royal Inst Technol KTH, Div Land & Water Resources Engn, S-10044 Stockholm, Sweden..
2018 (English)In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 229, no 11, article id 358Article in journal (Refereed) Published
Abstract [en]

Roads and traffic can be a source of water-bound pollutants, which can percolate through the unsaturated zone to groundwater. Deicing salt is widely used on roads in northern Europe during winter and is usually applied at a time when the temperature is below zero and the soil is partly frozen. Understanding the mechanism by which water-bound pollutants such as deicing salt are transferred from roads to groundwater is highly important for groundwater protection, environmental sustainability and road maintenance. Electrical resistivity tomography (ERT) can be used for tracing the infiltration of deicing salt in different seasons, including the frozen period, as a step towards identifying pollutant infiltration pathways. In this study, a tracer-ERT monitoring method and analytical process was developed and evaluated for use in investigating and demonstrating deicing salt infiltration pathways in road structures in different seasons and weather conditions. The method involves using dissolved sodium chloride as a tracer and monitoring its infiltration using a multi-electrode array system. The tracer tests were performed at the same location in different seasons over a 1-year period. The results indicated high seasonal variation in percolation pattern and flow velocity, with large decreases in December (winter), most likely due to preferential flow paths within the road shoulder. These findings can be applied to other water-soluble pollutants that move from the road surface to groundwater.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 229, no 11, article id 358
Keywords [en]
ERT, Tracer test, Flow pathways, Road, Hydrology
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-239085DOI: 10.1007/s11270-018-4008-6ISI: 000448508700017PubMedID: 30416221Scopus ID: 2-s2.0-85055443425OAI: oai:DiVA.org:kth-239085DiVA, id: diva2:1264911
Note

QC 20181121

Available from: 2018-11-21 Created: 2018-11-21 Last updated: 2018-11-21Bibliographically approved

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Rasul, HediEaron, RobertOlofsson, Bo

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