Diego Sampietro - Academia.edu (original) (raw)
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Papers by Diego Sampietro
The Japanese Atomic Energy Agency (JAEA) is being carried out an URL (underground research labora... more The Japanese Atomic Energy Agency (JAEA) is being carried out an URL (underground research laboratory) project in Mizunami city, central Japan. The project is a purpose-built generic URL project that is planned for a scientific study of the deep geological environment as a basis of research and development for geological disposal of nuclear wastes. In the project, groundwater flow model has been developed using the commercial software ConnectFlow, which is capable to generate hydrogeological models but it cannot account chemical processes. COMSOL is capable to include chemical processes in a hydrogeological model using iCP (interface COMSOL-PHREEQC) (Nardi et al., 2014). The URL geometry and the spatial distribution of hydrogeological conditions (hydraulic conductivity and porosity fields) have been implemented in COMSOL from the ConnectFlow files (Figure 1 and Figure 2). iCP uses COMSOL to solve the flow and the transport. The chemical part is solved by PHREEQC (Parkust and Apelo, ...
Groundwater, 2018
Currently, monitoring tools can be deployed in observation boreholes to better assess groundwater... more Currently, monitoring tools can be deployed in observation boreholes to better assess groundwater flow, flux of dissolved contaminants and their mass discharge in an aquifer. The relationship between horizontal water velocity in observation boreholes and Darcy fluxes in the surrounding aquifer has been studied for natural flow conditions (i.e., no pumping). Interpretation of measurements taken with dilution tests, the colloidal borescope, the Heat Pulse Flowmeter, and other techniques require the conversion of observed borehole velocity u to aquifer Darcy flux q∞. This conversion is typically done through a proportionality factor α = u/q∞. In experimental studies as well as in theoretical developments, reported values of α vary almost three orders of magnitude (from 0.5 to 10). This large variability in reported values of α could be explained by: (1) unclear distinction between Darcy flux and water seepage velocity, (2) unclear definition of water velocity in the borehole, (3) effec...
A challenge in modeling reactive transport in discrete fractures is how to conceptualize the matr... more A challenge in modeling reactive transport in discrete fractures is how to conceptualize the matrix-fracture interface. Most transport codes assume concentration continuity between the matrix and the fractures. Therefore, fracture and matrix cannot be treated as independent geochemical domains. However, the fracture properties should be modified by geochemical reactions independently of the processes in the matrix. Precipitation of mineral phases within the fracture or dissolution of minerals in the matrix can modify the fracture aperture. To properly model these processes and their feedback to the flow and transport properties, independent geochemical domains and aqueous concentrations are required.
Crop Protection, 2009
Fusarium verticillioides causes maize ear rot and contaminates kernels with fumonisin mycotoxins ... more Fusarium verticillioides causes maize ear rot and contaminates kernels with fumonisin mycotoxins in Argentina. The aim of this work was to elucidate if the kernel pericarp and its surface wax layer are resistance factors to fumonisin accumulation in maize genotypes from Argentina. Fourteen maize genotypes were inoculated with F. verticillioides in laboratory assays. Intact kernels of genotypes resistant to fumonisin
The Japanese Atomic Energy Agency (JAEA) is being carried out an URL (underground research labora... more The Japanese Atomic Energy Agency (JAEA) is being carried out an URL (underground research laboratory) project in Mizunami city, central Japan. The project is a purpose-built generic URL project that is planned for a scientific study of the deep geological environment as a basis of research and development for geological disposal of nuclear wastes. In the project, groundwater flow model has been developed using the commercial software ConnectFlow, which is capable to generate hydrogeological models but it cannot account chemical processes. COMSOL is capable to include chemical processes in a hydrogeological model using iCP (interface COMSOL-PHREEQC) (Nardi et al., 2014). The URL geometry and the spatial distribution of hydrogeological conditions (hydraulic conductivity and porosity fields) have been implemented in COMSOL from the ConnectFlow files (Figure 1 and Figure 2). iCP uses COMSOL to solve the flow and the transport. The chemical part is solved by PHREEQC (Parkust and Apelo, ...
Groundwater, 2018
Currently, monitoring tools can be deployed in observation boreholes to better assess groundwater... more Currently, monitoring tools can be deployed in observation boreholes to better assess groundwater flow, flux of dissolved contaminants and their mass discharge in an aquifer. The relationship between horizontal water velocity in observation boreholes and Darcy fluxes in the surrounding aquifer has been studied for natural flow conditions (i.e., no pumping). Interpretation of measurements taken with dilution tests, the colloidal borescope, the Heat Pulse Flowmeter, and other techniques require the conversion of observed borehole velocity u to aquifer Darcy flux q∞. This conversion is typically done through a proportionality factor α = u/q∞. In experimental studies as well as in theoretical developments, reported values of α vary almost three orders of magnitude (from 0.5 to 10). This large variability in reported values of α could be explained by: (1) unclear distinction between Darcy flux and water seepage velocity, (2) unclear definition of water velocity in the borehole, (3) effec...
A challenge in modeling reactive transport in discrete fractures is how to conceptualize the matr... more A challenge in modeling reactive transport in discrete fractures is how to conceptualize the matrix-fracture interface. Most transport codes assume concentration continuity between the matrix and the fractures. Therefore, fracture and matrix cannot be treated as independent geochemical domains. However, the fracture properties should be modified by geochemical reactions independently of the processes in the matrix. Precipitation of mineral phases within the fracture or dissolution of minerals in the matrix can modify the fracture aperture. To properly model these processes and their feedback to the flow and transport properties, independent geochemical domains and aqueous concentrations are required.
Crop Protection, 2009
Fusarium verticillioides causes maize ear rot and contaminates kernels with fumonisin mycotoxins ... more Fusarium verticillioides causes maize ear rot and contaminates kernels with fumonisin mycotoxins in Argentina. The aim of this work was to elucidate if the kernel pericarp and its surface wax layer are resistance factors to fumonisin accumulation in maize genotypes from Argentina. Fourteen maize genotypes were inoculated with F. verticillioides in laboratory assays. Intact kernels of genotypes resistant to fumonisin