Role of soil pore structure in water infiltration and CO2 exchange between the atmosphere and underground air in the vadose zone: A combined laboratory and field approach
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Título: | Role of soil pore structure in water infiltration and CO2 exchange between the atmosphere and underground air in the vadose zone: A combined laboratory and field approach |
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Autor/es: | Pla, Concepción | Cuezva Robleño, Soledad | Martínez Martínez, Javier | Fernández Cortés, Ángel | García Antón, Elena | Fusi, Nicoletta | Crosta, Giovanni Battista | Cuevas González, Jaime | Cañaveras, Juan C. | Sánchez Moral, Sergio | Benavente, David |
Grupo/s de investigación o GITE: | Petrología Aplicada | Ingeniería Hidráulica y Ambiental (INGHA) |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Ingeniería Civil | Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente |
Palabras clave: | CO2 | Soil gas diffusion | Water content | Underground cave | Vadose zone |
Área/s de conocimiento: | Ingeniería Hidráulica | Petrología y Geoquímica | Geodinámica Externa |
Fecha de publicación: | feb-2017 |
Editor: | Elsevier |
Cita bibliográfica: | Catena. 2017, 149(Part 1): 402-416. doi:10.1016/j.catena.2016.10.018 |
Resumen: | The soils above caves represent a membrane that regulates the connection between the underground environment and the outside atmosphere. In this study, soils from two different field sites (Cueva de Altamira and Cueva del Rull in Spain) are investigated. Field results are analysed and linked to laboratory tests. Several laboratory experiments are performed to quantify CO2 diffusion coefficients and water infiltration rates in these soils under different degrees of soil water saturation and compaction. Tests confirm that the grain size distribution, organic matter content, mineral composition and water content of soils affect gas transport through the soil pore network. Both field and lab results reveal that Altamira soil has a coarser texture and therefore has higher CO2 diffusion coefficients, infiltration rates and hydraulic conductivity values than Rull soil. Rull soil contains a higher proportion of fine particles and organic matter, which explains the lower fluid transport coefficients. When soils are near saturation, fluid transport does not depend on the physical properties of soil but depends on the soil water content. In this state, liquid transport regulates the available space within the soil pores, which leads to a reduction in the gaseous diffusion coefficient of the soil. After rainfall episodes, the connection between the exterior atmosphere and underground cavities is hindered due to a rise in the soil water content, which is responsible for the closure of the overlying membrane. This study demonstrates that soil-produced CO2 reaches the underground atmosphere through diffusion processes that are controlled by the intrinsic properties of soil (porosity, grain size distribution, texture, mineralogy and organic matter content) and soil water content. |
Patrocinador/es: | This research was funded by the Spanish Ministry of Economy and Competitiveness projects CGL2011-25162 and CGL2013-43324-R and its programme Torres Quevedo (PTQ 13-06296). A pre-doctoral research fellowship (BES-2012-053468) was awarded to C. Pla for the project CGL2011-25162. Funding was also provided by the People Programme (Marie Curie Actions–Intra-European Fellowships, call 2013) of the European Union's Seventh Framework Programme (FP7/2007–2013) under the REA grant agreement n° 624204. |
URI: | http://hdl.handle.net/10045/63248 |
ISSN: | 0341-8162 (Print) | 1872-6887 (Online) |
DOI: | 10.1016/j.catena.2016.10.018 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2016 Elsevier B.V. |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1016/j.catena.2016.10.018 |
Aparece en las colecciones: | Investigaciones financiadas por la UE INV - PETRA - Artículos de Revistas INV - IngHA - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2017_Pla_etal_Catena_final.pdf | Versión final (acceso restringido) | 1,87 MB | Adobe PDF | Abrir Solicitar una copia |
2017_Pla_etal_Catena_preprint.pdf | Preprint (acceso abierto) | 2,35 MB | Adobe PDF | Abrir Vista previa |
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