One-Dimensional Transport with Equilibrium Chemistry (OTEQ) - A reactive transport model for streams and rivers

Runkel, Robert L.

doi:10.3133/tm6b6

Cited by 32 publications

(41 citation statements)

References 26 publications

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“…Assumption of equilibrium chemistry in hyporheic exchange models [e.g., Runkel et al ., , , ; Runkel , ; Wörman et al ., ; A. F. Aubeneau et al, submitted manuscript, 2014] also depends on hyporheic exchange rates. Numerically, these models instantaneously reequilibrate chemical constituents following each transport step.…”

Section: Hyporheic Biogeochemistrymentioning

confidence: 99%

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Hyporheic flow and transport processes: Mechanisms, models, and biogeochemical implications

et al. 2014

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Fifty years of hyporheic zone research have shown the important role played by the hyporheic zone as an interface between groundwater and surface waters. However, it is only in the last two decades that what began as an empirical science has become a mechanistic science devoted to modeling studies of the complex fluid dynamical and biogeochemical mechanisms occurring in the hyporheic zone. These efforts have led to the picture of surface-subsurface water interactions as regulators of the form and function of fluvial ecosystems. Rather than being isolated systems, surface water bodies continuously interact with the subsurface. Exploration of hyporheic zone processes has led to a new appreciation of their wide reaching consequences for water quality and stream ecology. Modern research aims toward a unified approach, in which processes occurring in the hyporheic zone are key elements for the appreciation, management, and restoration of the whole river environment. In this unifying context, this review summarizes results from modeling studies and field observations about flow and transport processes in the hyporheic zone and describes the theories proposed in hydrology and fluid dynamics developed to quantitatively model and predict the hyporheic transport of water, heat, and dissolved and suspended compounds from sediment grain scale up to the watershed scale. The implications of these processes for stream biogeochemistry and ecology are also discussed.

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Section: Hyporheic Biogeochemistrymentioning

confidence: 99%

“…Assumption of equilibrium chemistry in hyporheic exchange models [e.g., Runkel et al, 1996aRunkel et al, , 1996bRunkel et al, , 1999Runkel, 2010;Wörman et al, 1998;A. F. Aubeneau et al, submitted manuscript, 2014] also depends on hyporheic exchange rates.…”

Section: 1002/2012rg000417mentioning

confidence: 99%

Hyporheic flow and transport processes: Mechanisms, models, and biogeochemical implications

et al. 2014

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“…Ensign and Doyle [] examined results from many tracer experiments that quantified nutrient retention in streams and assessed the possible role of hyporheic flow. The reactive solute transport capabilities of OTIS were expanded in the One‐Dimensional Transport with Equilibrium Chemistry model (OTEQ) that solves the equilibrium submodel MINTEQ in the context of transport with groundwater‐surface water interactions [ Runkel , ]. This model has been extensively tested in applications involving fate of metals released by acidic mine drainage.…”

Section: Measuring Hydrologic Exchange Flowsmentioning

confidence: 99%

River corridor science: Hydrologic exchange and ecological consequences from bedforms to basins

2015

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Previously regarded as the passive drains of watersheds, over the past 50 years, rivers have progressively been recognized as being actively connected with off‐channel environments. These connections prolong physical storage and enhance reactive processing to alter water chemistry and downstream transport of materials and energy. Here we propose river corridor science as a concept that integrates downstream transport with lateral and vertical exchange across interfaces. Thus, the river corridor, rather than the wetted river channel itself, is an increasingly common unit of study. Main channel exchange with recirculating marginal waters, hyporheic exchange, bank storage, and overbank flow onto floodplains are all included under a broad continuum of interactions known as “hydrologic exchange flows.” Hydrologists, geomorphologists, geochemists, and aquatic and terrestrial ecologists are cooperating in studies that reveal the dynamic interactions among hydrologic exchange flows and consequences for water quality improvement, modulation of river metabolism, habitat provision for vegetation, fish, and wildlife, and other valued ecosystem services. The need for better integration of science and management is keenly felt, from testing effectiveness of stream restoration and riparian buffers all the way to reevaluating the definition of the waters of the United States to clarify the regulatory authority under the Clean Water Act. A major challenge for scientists is linking the small‐scale physical drivers with their larger‐scale fluvial and geomorphic context and ecological consequences. Although the fine scales of field and laboratory studies are best suited to identifying the fundamental physical and biological processes, that understanding must be successfully linked to cumulative effects at watershed to regional and continental scales.

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“…One disadvantage of OTIS is that the reactivity of metals is oversimplified. In cases where remediation is expected to significantly improve instream pH, a reactive transport model that employs equilibrium chemistry, such as OTEQ (One dimensional Transport with EQuilibrium chemistry (Runkel, 2010)), might be preferable. OTEQ is another solute‐transport model that has been utilized to illustrate effects of hypothetical remediation (Runkel and Kimball, 2002; Kimball and Runkel, 2010).…”

Section: Resultsmentioning

confidence: 99%

Using Spatially Detailed Water‐Quality Data and Solute‐Transport Modeling to Support Total Maximum Daily Load Development¹

Walton-Day

Runkel

Kimball

2012

J American Water Resour Assoc

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Walton‐Day, Katherine, Robert L. Runkel, and Briant A. Kimball, 2012. Using Spatially Detailed Water‐Quality Data and Solute‐Transport Modeling to Support Total Maximum Daily Load Development. Journal of the American Water Resources Association (JAWRA) 48(5): 949‐969. DOI: 10.1111/j.1752‐1688.2012.00662.x Abstract: Spatially detailed mass‐loading studies and solute‐transport modeling using OTIS (One‐dimensional Transport with Inflow and Storage) demonstrate how natural attenuation and loading from distinct and diffuse sources control stream water quality and affect load reductions predicted in total maximum daily loads (TMDLs). Mass‐loading data collected during low‐flow from Cement Creek (a low‐pH, metal‐rich stream because of natural and mining sources, and subject to TMDL requirements) were used to calibrate OTIS and showed spatially variable effects of natural attenuation (instream reactions) and loading from diffuse (groundwater) and distinct sources. OTIS simulations of the possible effects of TMDL‐recommended remediation of mine sites showed less improvement to dissolved zinc load and concentration (14% decrease) than did the TMDL (53‐63% decrease). The TMDL (1) assumed conservative transport, (2) accounted for loads removed by remediation by subtracting them from total load at the stream mouth, and (3) did not include diffuse‐source loads. In OTIS, loads were reduced near their source; the resulting concentration was decreased by natural attenuation and increased by diffuse‐source loads during downstream transport. Thus, by not including natural attenuation and loading from diffuse sources, the TMDL overestimated remediation effects at low flow. Use of the techniques presented herein could improve TMDLs by incorporating these processes during TMDL development.

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One-Dimensional Transport with Equilibrium Chemistry (OTEQ) - A reactive transport model for streams and rivers

Cited by 32 publications

References 26 publications

Hyporheic flow and transport processes: Mechanisms, models, and biogeochemical implications

Hyporheic flow and transport processes: Mechanisms, models, and biogeochemical implications

River corridor science: Hydrologic exchange and ecological consequences from bedforms to basins

Using Spatially Detailed Water‐Quality Data and Solute‐Transport Modeling to Support Total Maximum Daily Load Development¹

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One-Dimensional Transport with Equilibrium Chemistry (OTEQ) - A reactive transport model for streams and rivers

Cited by 32 publications

References 26 publications

Hyporheic flow and transport processes: Mechanisms, models, and biogeochemical implications

Hyporheic flow and transport processes: Mechanisms, models, and biogeochemical implications

River corridor science: Hydrologic exchange and ecological consequences from bedforms to basins

Using Spatially Detailed Water‐Quality Data and Solute‐Transport Modeling to Support Total Maximum Daily Load Development1

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Using Spatially Detailed Water‐Quality Data and Solute‐Transport Modeling to Support Total Maximum Daily Load Development¹