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On the distribution of water age along hydrological pathways with transient flow
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.
2013 (English)In: Water resources research, ISSN 0043-1397, E-ISSN 1944-7973, Vol. 49, no 9, 5238-5245 p.Article in journal (Refereed) Published
Abstract [en]

Water age is a transient spatially distributed measure of how long water molecules are present in a hydrological system since their origin, of relevance for a variety of applications. We present a simplified analytical model for the water age distribution under arbitrary transient flow along one-dimensional hydrological pathways with mean flow approximately uniform in space and constant macrodispersivity. The proposed model is verified using Monte Carlo trajectory simulations, as well as with the analytical solution for a temporal step change of the mean velocity. The derived solution can be used for scoping calculations, for studying the coupled effects of macrodispersion and time variations on the water age distribution, as well as for benchmarking numerical simulation tools.

Place, publisher, year, edition, pages
2013. Vol. 49, no 9, 5238-5245 p.
Keyword [en]
water age, transient flow, macrodispersion, hydrological transport, analytical model, trajectories
National Category
Environmental Engineering
Identifiers
URN: urn:nbn:se:kth:diva-134586DOI: 10.1002/wrcr.20402ISI: 000325991100009Scopus ID: 2-s2.0-84883266521OAI: oai:DiVA.org:kth-134586DiVA: diva2:667715
Note

QC 20131127

Available from: 2013-11-27 Created: 2013-11-25 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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