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Global sensitivity analysis of groundwater transport
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
2015 (English)In: Journal of Hydrology, ISSN 0022-1694, E-ISSN 1879-2707, Vol. 531Article in journal (Refereed) Published
Abstract [en]

In this work we address the model and parametric sensitivity of groundwater transport using the Lagrangian-Stochastic Advection-Reaction (LaSAR) methodology. The 'attenuation index' is used as a relevant and convenient measure of the coupled transport mechanisms. The coefficients of variation (CV) for seven uncertain parameters are assumed to be between 0.25 and 3.5, the highest value being for the lower bound of the mass transfer coefficient k0. In almost all cases, the uncertainties in the macro-dispersion (CV = 0.35) and in the mass transfer rate k0 (CV = 3.5) are most significant. The global sensitivity analysis using Sobol and derivative-based indices yield consistent rankings on the significance of different models and/or parameter ranges. The results presented here are generic however the proposed methodology can be easily adapted to specific conditions where uncertainty ranges in models and/or parameters can be estimated from field and/or laboratory measurements.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 531
Keyword [en]
Attenuation index, Global sensitivity, Groundwater transport, Macro-dispersion, Mass transfer, Travel time, Dispersions, Groundwater, Sensitivity analysis, Stochastic models, Stochastic systems, Coefficients of variations, Global sensitivity analysis, Laboratory measurements, Parametric sensitivity, Uncertain parameters, Uncertainty analysis
National Category
Water Engineering Geotechnical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-175643DOI: 10.1016/j.jhydrol.2015.07.035ISI: 000366769200013Scopus ID: 2-s2.0-84947032737OAI: oai:DiVA.org:kth-175643DiVA: diva2:865054
Note

QC 20151026

Available from: 2015-10-26 Created: 2015-10-19 Last updated: 2017-10-02Bibliographically 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. 24 p.
Series
TRITA-LWR. PHD, ISSN 1650-8602 ; 2017:10
Keyword
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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