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Response functions for in-stream solute transport in river networks
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630), Hydraulic Engineering (moved 20130630).ORCID iD: 0000-0003-2716-4446
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630), Hydraulic Engineering (moved 20130630).
2011 (English)In: Water resources research, ISSN 0043-1397, E-ISSN 1944-7973, Vol. 47, no W06502Article in journal (Refereed) Published
Abstract [en]

This paper analyzes the effects of different hydrological mechanisms on the solute response in watershed stream networks. Important processes are due to the hydraulic and chemical retention of reactive solutes in transient storage zones and the cumulative consequences of these processes from a single transport pathway as well as from the network of transport pathways. Temporal moments are derived for a distributed stream network and for a compartment-in-series model. The temporal moments are evaluated and are utilized to derive formal expressions for translating the network parameters into compartmental model parameters. The analysis reveals that in addition to the hydraulic and chemical retention processes, the morphological and topological properties of a watershed have a distinct impact on the central temporal moments in terms of averaging of the solute load weighted distances as well as the transport parameters over the network. Kinetic (rate-limited) transient storage affects second-order and higher central temporal moments and thus has a secondary effect on the parameterization of compartmental models. Additional considerable contributions to all temporal moments are introduced when parameter variability along transport pathways is considered. The paper demonstrates an improved model outcome for phosphorus transport in a small Swedish watershed by accounting for the overall network effects when parameterizing a compartment-in-series model.

Place, publisher, year, edition, pages
2011. Vol. 47, no W06502
Keyword [en]
subsurface water exchange, transient storage model, hyporheic exchange, longitudinal dispersion, compartmental-models, hydrologic response, bed forms, zone, catchment, tracer
National Category
Water Engineering
URN: urn:nbn:se:kth:diva-39185DOI: 10.1029/2010WR009412ISI: 000291560500001ScopusID: 2-s2.0-79958138016OAI: diva2:439501

QC 20110908

Available from: 2011-09-08 Created: 2011-09-08 Last updated: 2016-08-23Bibliographically 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.
TRITA-LWR. PHD, ISSN 1650-8602 ; 2014:05
Solute transport modeling; Transient storage; Tracer test; Central temporal moments; Spectral analysis; Parameterization
National Category
Oceanography, Hydrology, Water Resources
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)

QC 20140826

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

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Riml, JoakimWörman, Anders
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