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Contaminant attenuation by shallow aquifer systems under steady flow
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.
2017 (English)In: Advances in Water Resources, ISSN 0309-1708, E-ISSN 1872-9657, Vol. 108, p. 157-169Article in journal (Refereed) Published
Abstract [en]

We present a framework for analyzing advection-dominated solute transport and transformation in aquifer systems of boreal catchments that are typically shallow and rest on crystalline bedrock. A methodology is presented for estimating tracer discharge based on particle trajectories from recharge to discharge locations and computing their first passage times assuming that the flow pattern is approximately steady-state. Transformation processes can be included by solving one-dimensional reactive transport with randomized water travel time as the independent variable; the distribution of the travel times incorporates morphological dispersion (due to catchment geometry/topography) as well as macro-dispersion (due to heterogeneity of underlying hydraulic properties). The implementation of the framework is illustrated for the well characterized coastal catchment of Forsmark (Sweden). We find that macro-dispersion has a notable effect on attenuation even though the morphological dispersion is significantly larger. Preferential flow on the catchment scale is found to be considerable with only 5% of the Eulerian velocities contributing to transport over the simulation period of 375 years. Natural attenuation is illustrated as a simple (linear decay) transformation process. Simulated natural attenuation can be estimated analytically reasonably well by using basic hydrological and structural information, the latter being the pathway length distribution and average aquifer depth to the bedrock.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 108, p. 157-169
Keywords [en]
Hydrological transport, Numerical modeling, Pathway lengths, Statistical distribution, Water travel time
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-212220DOI: 10.1016/j.advwatres.2017.07.019ISI: 000411868400012Scopus ID: 2-s2.0-85026760262OAI: oai:DiVA.org:kth-212220DiVA, id: diva2:1134152
Note

QC 20170818

Available from: 2017-08-18 Created: 2017-08-18 Last updated: 2017-11-02Bibliographically approved
In thesis
1. Hydrological Transport in Shallow Catchments:: tracer discharge, travel time and water age
Open this publication in new window or tab >>Hydrological Transport in Shallow Catchments:: tracer discharge, travel time and water age
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This focuses on hydrological transport in shallow catchments with topography-driven flow paths. The thesis gives new insight to kinematic pathway models for estimation of tracer discharge at the catchment outlet. A semi-analytical methodology is presented for transient travel time and age distributions referred to as "kinematic pathway approach“(KPA) that accounts for dispersion at two levels of morphological and macro-dispersion. Macro-dispersion and morphological dispersion components are reflected in KPA by assuming an effective Péclet number and topographically driven pathway length distributions, respectively. The kinematic measure of the transport, defined as a characteristic velocity of water flow through the catchment is obtained from the overall water balance in the catchment. To include transformation process in its simplest form of linear decay/degradation a framework is presented that solves one-dimensional reactive transport with numerically simulated travel times as the independent variable. The proposed KPA and coupled transport framework for quantifying tracer discharge at the shallow catchment outlet are applied to two selected catchments in Sweden. KPA is applied to modeling of a 23-year long chloride data series for the Kringlan catchment whereas the implantation of the framework for quantifying natural attenuation is illustrated for the Forsmark catchment. Numerical simulations of Forsmark catchment advective travel times are obtained by means of particle tracking using the fully-integrated flow model MIKE SHE. The KPA is found to provide reasonable estimates of tracer discharge distribution when considering the transport controlled by hillslope processes associated with short topographically driven flow paths to adjacent discharge zones, e.g. rivers and lakes. Simulated natural attenuation for Forsmark is also estimated well provided that the pathway length distribution is skewed toward short pathway lengths. This fact is indicative of the controlling impact of topography on flow path length and travel time distributions in shallow catchments. Our work has shown that the pathway (Lagrangian) methodologies are promising as predictive tools for hydrological transport. 

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. p. 24
Series
TRITA-LWR. PHD, ISSN 1650-8602 ; 2017:10
Keywords
Hydrological transport, travel time, water age, tracer discharge, Lagrangian/pathway approach, pathway lengths, numerical modeling
National Category
Engineering and Technology
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-214971 (URN)978-91-7729-539-6 (ISBN)
Public defence
2017-10-20, Kollegiesalen, Brinellvägen 8,, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170928

Available from: 2017-09-28 Created: 2017-09-27 Last updated: 2017-10-02Bibliographically approved

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