Tracer experiments are valuable tools for analyzing the transport characteristics of streams and their interactions with shallow groundwater. The focus of this work is the design of tracer studies in high-gradient stream systems subject to advection, dispersion, groundwater inflow, and exchange between the active channel and zones in surface or subsurface water where flow is stagnant or slow mo...

this study was reported by Regalado et al. (2003) and Muñoz-Carpena et al. (2005). Volcanic soils exhibit particular physical-chemical properties (i.e., The intensive use of agrichemicals in volcanic agriculstrong and stable natural aggregation and high content of variablecharge minerals) that may influence solute transport. To determine tural fields, as for many other areas of the world, has l...

The transient storage model (TSM) has been widely used in studies of stream solute transport and fate, with an increasing emphasis on reactive solute transport. In this study we perform sensitivity analyses of a conservative TSM and two different reactive solute transport models (RSTM), one that includes first-order decay in the stream and the storage zone, and a second that considers sorption ...

The study of solute transport processes in the soil requires the determination of the adsorption coefficient. A laboratory experiment based on Batch equilibrium method was developed. This method involves contacting a chosen soil with water solutions with different concentrations and adjusted the obtained isotherms on analytical models. The method was applied to three soils and the results have ...

Solute mass transport in porous media is strongly correlated with pore fluid flow. The analysis of solute transport is an effective means for studying medium heterogeneities. In this study, we discuss the effects of heterogeneity on the tracer transport. Assuming steady fluid flow, we have simulated tracer transport in various permeability heterogeneities. The results show that the tracer distr...

There is a limited understanding of solute transport properties of degraded peat soils as compared to mineral substrates. A lower organic matter (OM) content is often the result of peat degradation and mineralization following artificial drainage. In this study, we aimed at deducing changes in solute transport properties of peat soils differing in OM content. Miscible displacement experiments w...