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• W2007379216 abstract "Surface area of volcanic ash particles is of great importance to research including plume dynamics, particle chemical and water reactions in the plume, modelling (i.e. plume shape, particle interactions, dispersion etc.), remote sensing of transport and SO2, HCl, H2O, CO2 levels, forecasting plume location, and transportation and deposition of ash particles. The implemented method presented in this study offers new insights for surface characterization of volcanic ash particles on macro-pore regions. Surface area and volumes of volcanic ash particles were measured using digital elevation models (DEM) reconstructed from stereoscopic images acquired from different angles by scanning electron microscope (SEM). The method was tested using glycidyl methacrylate (GMA) micro-spheres which exhibit low spherical imperfections. The differences between measured and geometrically calculated surface areas were introduced for both micro-spheres and volcanic ash particles in order to highlight the probable errors in modelling on volcanic ash behaviour. The specific surface areas of volcanic ash particles using this method are reduced by half (from mean values of 0.045 m2/g to 0.021 m2/g) for the size increment 63 µm to 125 µm. Ash particles mostly have higher specific surface area values than the geometric forms irrespective of particle size. The specific surface area trends of spheres and ash particles resemble for finer particles (63 µm). Approximation to sphere and ellipsoid have similar margin of error for coarser particles (125 µm) but both seem to be inadequate for representation of real ash surfaces." @default.
• W2007379216 created "2016-06-24" @default.
• W2007379216 creator A5027400638 @default.
• W2007379216 date "2010-02-01" @default.
• W2007379216 modified "2023-10-17" @default.
• W2007379216 title "Surface area and volume measurements of volcanic ash particles by SEM stereoscopic imaging" @default.
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• W2007379216 doi "https://doi.org/10.1016/j.jvolgeores.2009.12.006" @default.
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