In situ Permeability Measurements Based on a Radial Gas Advection
Model: Relationships Between Soil Permeability and Diffuse CO2 Degassing in Volcanic Areas |
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Authors: | Marco Camarda Sergio Gurrieri Mariano Valenza |
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Institution: | (1) Istituto Nazionale Geofisica e Vulcanologia, Sezione di Palermo, V. Ugo La Malfa 153, 90146 Palermo, Italy;(2) Dipartimento Chimica e Fisica della Terra ed Applicazioni, , V. Archirafi 36, 90100 Palermo, Italy |
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Abstract: | In this paper we have developed a new method for measuring in situ soil permeability, which is based on the theory of radial gas advection through an isotropic porous medium. The method was
tested in the laboratory and at several locations on the island of Vulcano (Aeolian Islands, Italy). It consists of a special
device which generates a gas source at a depth of 50 cm and it permits measurement of the relative induced pressure in nearby
soil at different depths. The characteristic error of the method was less than 10%.
Furthermore, soil permeability measurements were carried out in the island of Vulcano during different periods of the year
(between May 2000 and June 2001). A strong decrease in permeability in the upper layers of the soil during and after rainfall
was noted, with very poor correlations between the spatial
distributions of soil CO2 flux and shallow soil permeability. |
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Keywords: | Gas soil permeability volcanic areas radial gas advection soil degassing |
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