Modeling Soluble Chemical Transfer to Runoff with Rainfall Impact as a Diffusion Process

Ahuja, Lajpat R.

doi:10.2136/sssaj1990.03615995005400020003x

Cited by 73 publications

(56 citation statements)

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“…The mixing layer approach assumes that rainwater, soil solution, and runoff water mix instantaneously, due to raindrop impact, in a mixing, or exchange, layer that sits just below the soil surface, and that there is no transport toward the mixing layer from deeper layers of soil [Ahuja, 1990;Ahuja and Lehman, 1983;Steenhuis et al, 1994a;Steenhuis and Walter, 1980;Zhang et al, 1999Zhang et al, , 1999. The diffusion approach suggests that solutes are transported from soil into runoff in a diffusion process, while ignoring the effect of raindrops [Wallach, 1991;Wallach and van Genuchten, 1990].…”

Section: Transfer Of Solutes From the Soil To Overland Flowmentioning

confidence: 99%

“…Both approaches were successfully fitted to experimental data; however, assumptions made to ensure good fits either allowed for the theoretical mixing layer depth to exceed experimentally observed values or introduced immeasurable parameters. In essence, these efforts addressed two distinct mechanisms of solute transport with models that either explicitly allowed for only one, or incorporated multiple processes via inclusion of parameters with no clear physical definition [Ahuja, 1990;Steenhuis et al, 1994b;Steenhuis and Walter, 1980;Wallach and van Genuchten, 1990].…”

Section: Transfer Of Solutes From the Soil To Overland Flowmentioning

confidence: 99%

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Solute and sediment transport at laboratory and field scale: Contributions of J.-Y. Parlange

et al. 2013

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[1] We explore selected aspects of J.-Y. Parlange's contributions to hydrological transport of solutes and sediments, including both the laboratory and field scales. At the laboratory scale, he provided numerous approximations for solute transport accounting for effects of boundary conditions, linear and nonlinear reactions, and means to determine relevant parameters. Theory was extended to the field scale with, on the one hand, the effect of varying surface boundary conditions and, on the other, effects of soil structure heterogeneity. Soil erosion modeling, focusing on the Hairsine-Rose model, was considered in several papers. His main results, which provide highly usable approximations for grain-size class dependent sediment transport and deposition, are described. The connection between solute in the soil and that in overland flow was also investigated by Parlange. His theory on exchange of solutes between these two compartments, and subsequent movement, is presented. Both deterministic and stochastic approaches were considered, with application to microbial transport. Beyond contaminant transport, Parlange's fundamental contributions to the movement of solutes in hypersaline natural environments provided accurate predictions of vapor and liquid movement in desert, agricultural, and anthropogenic fresh-saline interfaces in porous media, providing the foundation for this area of research.

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Section: Transfer Of Solutes From the Soil To Overland Flowmentioning

confidence: 99%

Section: Transfer Of Solutes From the Soil To Overland Flowmentioning

confidence: 99%

Solute and sediment transport at laboratory and field scale: Contributions of J.-Y. Parlange

et al. 2013

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“…Note that d ml is a conceptual parameter that attempts to simulate the active layer of the soil that will exchange pesticide with the runoff and control the extraction and availability of a pesticide from the top soil. Ahuja (1986Ahuja ( , 1990 noted that non-uniform exchange could occur from soil depths up to 2 cm. Early versions of PRZM originally specified d ml as 1 cm and the later versions of PRZM (version 3) contained in the current pesticide assessment framework use 2 cm supported by inverse calibration against observed field data (Suarez, 2005).…”

Section: Pesticide Partitioning and Residuementioning

confidence: 99%

Does mechanistic modeling of filter strip pesticide mass balance and degradation processes affect environmental exposure assessments?

et al. 2015

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“…zero tillage and surface mulching) decrease erosion, thereby decreasing the loss of chemicals attached to sediment, the loss of chemicals in solution can be increased (Barisas et al, 1978;Ahuja, 1990;Soileau et al, 1994). This is because conservation tillage practices require greater pesticide and herbicide use and also because chemicals generally are applied to the soil surface with minimal incorporation into the soil (Ahuja, 1990). Furthermore, for the most common herbicides a large percentage (up to 90%) of the loss in runo is in solution form (Baker et al, , 1982.…”

Section: Introductionmentioning

confidence: 99%

“…This approach was used to determine the quantity of tracer resident near the soil surface at any given time. It was this solute near the soil surface that was subject to possible transport in the overland¯ow (Wallach et al, 1988;Ahuja, 1990;Wallach and van Genuchten, 1990;Wallach and Shabtai, 1992a,b). These models gave reasonable ®ts to experimental data from repacked boxes of soil, but required very large dispersion coecients to maintain solute near the surface and were less satisfactorily ®tted to ®eld data.…”

Section: Introductionmentioning

confidence: 99%

Solute transport by surface runoff from low-angle slopes: theory and application

et al. 2000

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Abstract:The removal of chemicals in solution by overland¯ow from agricultural land has the potential to be a signi®cant source of chemical loss where chemicals are applied to the soil surface, as in zero tillage and surfacemulched farming systems. Currently, we lack detailed understanding of the transfer mechanism between the soil solution and overland¯ow, particularly under ®eld conditions. A model of solute transfer from soil solution to overland¯ow was developed. The model is based on the hypothesis that a solute is initially distributed uniformly throughout the soil pore space in a thin layer at the soil surface. A fundamental assumption of the model is that at the time runo commences, any solute at the soil surface that could be transported into the soil with the in®ltrating water will already have been convected away from the area of potential exchange. Solute remaining at the soil surface is therefore not subject to further in®ltration and may be approximated as a layer of tracer on a plane impermeable surface. The model ®tted experimental data very well in all but one trial. The model in its present form focuses on the exchange of solute between the soil solution and surface water after the commencement of runo. Future model development requires the relationship between the mass transfer parameters of the model and the time to runo to be de®ned. This would enable the model to be used for extrapolation beyond the speci®c experimental results of this study. The close agreement between experimental results and model simulations shows that the simple transfer equation proposed in this study has promise for estimating solute loss to surface runo.

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Modeling Soluble Chemical Transfer to Runoff with Rainfall Impact as a Diffusion Process

Cited by 73 publications

References 0 publications

Solute and sediment transport at laboratory and field scale: Contributions of J.-Y. Parlange

Solute and sediment transport at laboratory and field scale: Contributions of J.-Y. Parlange

Does mechanistic modeling of filter strip pesticide mass balance and degradation processes affect environmental exposure assessments?

Solute transport by surface runoff from low-angle slopes: theory and application

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