scholarly journals Solute Transport Analysis with Chemical Reactions in Groundwater

1996 ◽  
Vol 38 (2) ◽  
pp. 113-125
Author(s):  
Kazuro MOMII ◽  
Kenji JINNO ◽  
Isao SHIOZAKI ◽  
Shin-Ichiro WADA
Keyword(s):  
Solute Transport ◽  
Chemical Reactions ◽  
Transport Analysis

Convective-diffusive-reactive Taylor dispersion processes in particulate multiphase systems

1990 ◽  
Vol 429 (1877) ◽  
pp. 639-671 ◽  
Keyword(s):  
Solute Transport ◽  
Chemical Reactions ◽  
Coarse Grained ◽  
Solution Technique ◽  
Multiphase System ◽  
Homogeneous Material ◽  
Phase System ◽  
Multiphase Systems ◽  
Phenomenological Coefficients ◽  
Reaction Processes

Convective-diffusive transport of a chemically reactive solute is studied analytically for a general model of a multiphase system composed of ordered or disordered particles of arbitrary shapes and sizes. Use of spatially periodic boundary conditions permits analysis of particulate multiphase systems of effectively infinite size. Solute transport occurs in both the continuous and discontinuous bulk phases, as well as within and across the interfacial phase boundaries separating them. Additionally, the solute is allowed to undergo generally inhomogeneous first-order irreversible chemical reactions occurring in both the continuous and discontinuous volumetric phases, as well as within the interfacial surface phase. Our object is that of globally describing the solute transport and reaction processes at a macro- or Darcy-scale level, wherein the resulting, coarse-grained particulate system is viewed as a continuum possessing homogeneous material transport and reactive properties. At this level the asymptotic long-time solute macrotransport process is shown to be governed by three Darcy-scale phenomenological coefficients: the mean solute velocity vector ͞U *, dispersivity dyadic ͞D *, and apparent volumetric reactivity coefficient ͞K *. A variant of a Taylor-Aris method-of-moments scheme (Brenner & Adler 1982), modified to include solute disappearance via chemical reactions, is used to express these three macroscale phenomenological coefficients in terms of the given microscale phenomenological data and geometry. The general solution technique, illustrated here for a simple, ordered geometrical realization of a two-phase system, reveals the competitive influences of the respective volumetric/surface-excess transport and reaction processes, as well as the solute adsorptivity, upon the three macroscale transport coefficients.

Development of Methodology of Groundwater Flow and Solute Transport Analysis in the Horonobe Area, Hokkaido, Japan

2010 ◽  
Author(s):  
Keisuke Maekawa ◽  
Hitoshi Makino ◽  
Hiroshi Kurikami ◽  
Tadafumi Niizato ◽  
Manabu Inagaki ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Solute Transport ◽  
Safety Assessment ◽  
Regional Scale ◽  
Flow Analysis ◽  
Sea Level Changes ◽  
Site Investigations ◽  
Assessment Techniques ◽  
Transport Analysis ◽  
Specific Safety

It is important for establishment of safety assessment techniques of geological disposal to understand groundwater flow and solute transport accurately. Therefore, we are positioning to confirm an applicability of the techniques in realistic environment as a crucial issue in R&D. We have attempted and planed some relevant studies as below: - A methodology to integrate activities from site investigations to evaluation of solute transport was examined. We have carried out groundwater flow analysis on a regional scale using geological and hydrological information from surface-based investigations at the Horonobe area, and also solute transport analysis based on the information of the trajectory analysis. - We have carried out a preliminary simulation of groundwater flow and salinity concentration distribution using information on climatic and sea-level changes, and evolution of geological structures considering the impacts of natural events and processes. Consequently, we could outline the impacts of natural events and processes on geological environment including hydrogeology, hydrochemistry and their evolutions. - We have been planning to develop and apply a methodology of groundwater flow and solute transport analysis to the shallow part, the Horonobe coastal area and around the URL. These techniques would become a basis for future site specific safety assessment in Japan.

scholarly journals Centrifugal Modeling and Validation of Solute Transport within Unsaturated Zone

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 610
Author(s):  
Huanhuan Qin
Keyword(s):  
Numerical Modeling ◽  
Numerical Model ◽  
Solute Transport ◽  
Chemical Reactions ◽  
Unsaturated Zone ◽  
Poor Quality ◽  
Physical Processes ◽  
Transport Simulation ◽  
Reactive Solutes

Numerical modeling has been adopted to assess the feasibility of centrifugal simulation of solute transport within the unsaturated zone. A numerical model was developed to study the centrifugal simulation of nonreactive, adsorption, radionuclide, and reactive solutes. The results showed that it is feasible to conduct centrifugal experiments for nonreactive solute transport. For the solute transport containing physical processes or chemical reactions, if the reaction is very rapid or slow, it is feasible to conduct centrifugal experiments. For the solute transport with a product B generated, if the reaction is relatively slow, the centrifugal prediction of solute is suitable. The centrifugal prediction of solute A matches the prototype quite well, but the prediction of B is in poor quality. If B is the focus, it is not feasible to conduct centrifugal experiments; but if B is not important, the centrifugal modeling is suitable. This has significant implications for the centrifugal modeling application to solute transport simulation within the unsaturated zone.

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