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Spatiotemporal decomposition of solute dispersion in watersheds
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering. Swedish Meteorological and Hydrological Institute, Sweden.ORCID iD: 0000-0003-2716-4446
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering.
2015 (English)In: Water resources research, ISSN 0043-1397, E-ISSN 1944-7973, Vol. 51, no 4, 2377-2392 p.Article in journal (Refereed) Published
Abstract [en]

Information about the effect of different dispersion mechanisms on the solute response in watersheds is crucial for understanding the temporal dynamics of many water quality problems. However, to quantify these processes from stream water quality time series may be difficult because the governing mechanisms responsible for the concentration fluctuations span a wide range of temporal and spatial scales. In an attempt to address the quantification problem, we propose a novel methodology that includes a spectral decomposition of the watershed solute response using a distributed solute transport model for the network of transport pathways in surface and subsurface water. Closed form solutions of the transport problem in both the Laplace and Fourier domains are used to derive formal expressions of (i) the central temporal moments of a solute pulse response and (ii) the power spectral response of a solute concentration time series. By evaluating high-frequency hydrochemical data from the Upper Hafren Watershed, Wales, we linked the watershed dispersion mechanisms to the damping of the concentration fluctuations in different frequency intervals reflecting various environments responsible for the damping. The evaluation of the frequency-dependent model parameters indicate that the contribution of the different environments to the concentration fluctuations at the watershed effluent varies with period. For the longest periods (predominantly groundwater transport pathways) we found that the frequency typical transport time of chloride was 100 times longer and that sodium had a 2.5 times greater retardation factor compared with the shortest periods (predominantly shallow groundwater and surface water transport pathways).

Place, publisher, year, edition, pages
2015. Vol. 51, no 4, 2377-2392 p.
Keyword [en]
solute transport, watershed dispersion, transport network, modeling, spectral analysis, central temporal moments
National Category
Oceanography, Hydrology, Water Resources
Research subject
Land and Water Resources Engineering
Identifiers
URN: urn:nbn:se:kth:diva-149531DOI: 10.1002/2014WR016385ISI: 000354733500029Scopus ID: 2-s2.0-84929624256OAI: oai:DiVA.org:kth-149531DiVA: diva2:739896
Note

QC 20150615. Updated from manuscript to article in journal.

Available from: 2014-08-22 Created: 2014-08-22 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Solute Transport Across Scales: Time Series Analyses of Water Quality Responses to Quantify Retention and Attenuation Mechanisms in Watersheds
Open this publication in new window or tab >>Solute Transport Across Scales: Time Series Analyses of Water Quality Responses to Quantify Retention and Attenuation Mechanisms in Watersheds
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The intra-continental movement of waterborne contaminants is governed by the distribution of solute load in the landscape along with the characteristics and distribution of the hydrological pathways that transport the solutes. An understanding of the processes affecting the transport and fate of the contaminants is crucial for assessments of solute concentrations and their environmental effect on downstream recipients. Elevated concentration of nutrients and the presence of anthropogenic substances, such as pharmaceutical residues, are two examples of the current problems related to hydrological transport. The overall objective of this thesis is to increase the mechanistic understanding of the governing hydrological transport processes and their links to geomorphological and biogeochemical retention and attenuation processes. Specifically, this study aims to quantify the processes governing the transport and fate of waterborne contaminants on the point, stream reach, and watershed scales by evaluating time series obtained from stream tracer tests and water quality monitoring data. The process quantification was achieved by deriving formal expressions for the key transport characteristics, such as the central temporal moments of a unit solute response function and the spectral scaling function for time series of solute responses, which attributes the solute response in the Laplace and Fourier domains to the governing processes and spatial regions within the watershed. The results demonstrate that in addition to the hydrological and biogeochemical processes, the distribution of the load in the landscape and the geomorphological properties in terms of the distribution of transport pathway distances have defined effects on the solute response. Furthermore, the spatial variability between and along the transport pathways significantly affect the solute response. The results indicate that environments with high retention and attenuation intensity, such as stream-reaches with pronounced hyporheic zones, may often dominate the solute flux in the watershed effluent, especially for reactive solutes. The mechanistic-based framework along with the evaluation methodologies presented within this study describes how the results can be generalized in terms of model parameters that reflect the hydrology, geomorphology and biogeochemistry in the studied area. This procedure is demonstrated by the parameterization of a compartment-in-series model for phosphorous transport.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. x, 62 p.
Series
TRITA-LWR. PHD, ISSN 1650-8602 ; 2014:05
Keyword
Solute transport modeling; Transient storage; Tracer test; Central temporal moments; Spectral analysis; Parameterization
National Category
Oceanography, Hydrology, Water Resources
Identifiers
urn:nbn:se:kth:diva-149528 (URN)978-91-7595-232-1 (ISBN)
Public defence
2014-09-12, F3, Lindstedtvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20140826

Available from: 2014-08-26 Created: 2014-08-22 Last updated: 2015-06-15Bibliographically approved

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Riml, Joakim

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