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This article in SSSAJ

  1. Vol. 52 No. 3, p. 612-618
     
    Received: May 26, 1987


    * Corresponding author(s):
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doi:10.2136/sssaj1988.03615995005200030002x

Transfer of Chemicals from Soil solution to Surface Runoff: A Diffusion-based Soil Model

  1. Rony Wallach,
  2. William A. Jury  and
  3. William F. Spencer
  1. Faculty of Agriculture, Hebrew Univ. of Jerusalem, Rehovot, Israel
    Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521
    USDA-ARS, Riverside, CA 92521

Abstract

Abstract

A physically-based diffusion and transport model is developed to describe chemical outflow concentrations during chemical removal from soil to overlying runoff water induced by continuous rainfall over the soil surface. In contrast to earlier models, movement from the soil to the runoff water is described as a liquid diffusion process to the surface, coupled to the runoff zone through a laminar boundary layer at the runoff interface with the soil surface. Within the soil, diffusion is moderated by equilibrium adsorption to solid surfaces characterized by a partition coefficient. The runoff concentration at the outlet is derived by treating the runoff zone as a wellmixed reactor, characterized by a residence time. The model was used to predict the results obtained in the experimental study of L.R. Ahuja and O.R. Lehman (1983) where infiltration was suppressed, with good agreement obtained between predicted and measured outflow concentrations when the model parameters were estimated independently using standard engineering equations from channel flow hydraulics. The model also predicted the final soil concentrations satisfactorily after runoff ceased.

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