Modified Fickian Model for Solute Uptake by Runoff

Richardson, Clinton P.; Parr, A. D.

doi:10.1061/(asce)0733-9372(1988)114:4(792)

Cited by 62 publications

(65 citation statements)

References 14 publications

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“…This situation is elementally different than dispersion within the sediment, but similar mechanisms might still limit exchange. In fact, studies of interfacial solute exchange have supported models with diffusion between the sediment and flow (e.g., Richardson and Parr, 1988;Nagoka and Ohgaki, 1990). As in the case of dispersion within the sediment, the chosen diffusivity is dependent on scales of flow intensity and bed permeability.…”

Section: Mechanics Of Fine Particle Depositionmentioning

confidence: 99%

“…To date, the most promising lead is the imposition of a diffusive flux at the sediment water interface. Richardson and Parr (1988) used interfacial diffusion to describe the effusion of solutes from sediments subjected to ruoff flow. This scenario can be inverted to describe the transport of particles with diffusive fluid flows into the sediment bed (model developed based on this idea is presented in Chapter 3).…”

Section: Link Between Deposition and Drag Coeffcientmentioning

confidence: 99%

“…The applicability of this flow model should be limited to the range of RK tested by Richardson and Parr (1988), which spans the range of values expected for sediments from fine sand to pea gravel.…”

Section: ' (314b)mentioning

confidence: 99%

“…77 Figure 3.3. Interfacial diffusion data from Richardson and Parr (1988). 79 Bessel function from (B.13).…”

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confidence: 99%

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Enhancement of fine particle deposition to permeable sediments

Fries¹

2002

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Predictions of deposition rate are integral to the transport of many constituents including contaminants, organic matter, and larvae. Review of the literature demonstrates a general appreciation for the potential control of deposition by bed roughness, but no direct tests involving flat sediment beds. Understanding the mechanisms at work for flat sediment beds would provide the basis for exploring more complicated bed conditions and the incorporation of other transport processes, such as bioturbation and bedload transport.Generally, fine particle deposition rates are assumed to be equivalent to the suspension settling velocity, therefore, deposition rates in excess of settling are considered enhanced. Flume observations of deposition were made using treatments that covered a wide range of flow, particle, and bed conditions. Specific treatments demonstrated large enhancements (up to eight times settling). Delivery of particles to the interface is important, but models based on delivery alone failed to predict the observed enhancement.This necessitated the development of a new model based on a balance between delivery and filtration in the bed. Interfacial diffsion was chosen as a model for particle delivery. Filtration of particles by the bed is a useful framework for retention, but the shear in the interstitial flow may introduce additional factors not included in traditional filtration experiments.The model performed well in prediction of flow conditions, but there remained a discrepancy between predictions and observed deposition rate, especially for treatments with significant enhancement. Fluid flow predictions by the model,; such as slip at the sediment water interface and fluid penetration into the sediment, appeared to be supported by flume experiments. Therefore, failure to predict the magnitude of enhancement was attbuted to far greater filtration effciencies for the sediment water interface than those measured in sediment columns. Emerging techniques to directly measure fluid and particle motion at the interface could reveal these mechanisms. The observation of enhanced deposition to flat sediment beds reinforces the importance of permeable sediments to the mediation of transport from the water column to the sediment bed.

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Section: Mechanics Of Fine Particle Depositionmentioning

confidence: 99%

Section: Link Between Deposition and Drag Coeffcientmentioning

confidence: 99%

Section: ' (314b)mentioning

confidence: 99%

“…77 Figure 3.3. Interfacial diffusion data from Richardson and Parr (1988). 79 Bessel function from (B.13).…”

mentioning

confidence: 99%

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Enhancement of fine particle deposition to permeable sediments

Fries¹

2002

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“…With the first method, the exchange is treated as a diffusive [36][37][38][39] or a first-order mass transfer process [8,40]. 5 In most applications, the exchange parameters involved in this method were determined empirically by fitting model predictions to exchange rate data obtained either from field observations or laboratory experiments.…”

Section: Introductionmentioning

confidence: 99%

Transport of nonsorbing solutes in a streambed with periodic bedforms

Jin

Tang

Gibbes

et al. 2010

Advances in Water Resources

100

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Previous studies of hyporheic zone focused largely on the net mass transfer of solutes between stream and streambed. Solute transport processes within the bed has attracted less investigation. In this study, we combined flume experiments and numerical simulations to examine solute transport processes in a streambed with periodic bedforms. Solute originating from the stream was subjected to advective transport driven by pore water circulation due to current-bedform interactions as well as hydrodynamic dispersion in the porous bed. The experimental and numerical results showed that advection played a dominant role at the early stage of solute transport, which took place in the hyporheic zone. Downward solute transfer to the deep ambient flow zone was controlled by transverse dispersion at the later stage when the elapsed time exceeded the advective transport characteristic time t c (= L/u c with L being the bedform length and u c the characteristic pore water velocity). The advection-based pumping exchange model was found to predict reasonably well solute transfer between the overlying water and streambed at the early stage but its performance deteriorated at the later stage. With dispersion neglected, the pumping exchange model underestimated the long-term rate and total mass of solute transfer from the overlying water to the bed.Therefore both advective and dispersive transport components are essential for quantification of hyporheic exchange processes.

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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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Modified Fickian Model for Solute Uptake by Runoff

Cited by 62 publications

References 14 publications

Enhancement of fine particle deposition to permeable sediments

Enhancement of fine particle deposition to permeable sediments

Transport of nonsorbing solutes in a streambed with periodic bedforms

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

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