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Descripción
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| In the last decades scientist have realized that soil processes are implicated the biggest global challenges facing humanity such as soil aeration, sequestration or emission of greenhouse gasses, volatilization of volatile organic chemicals among other phenomena. Progress in these challenges will depend on being able to understand the integrated behavior of soil as a system, and dealing with the complexity in describing soil in these terms. In this work we focus in one of the critical soil issues: soil structure and pore connectivity. A quantitative and explicit characterization of soil structure is difficult because of the complexity of the pore space. We proposed a model to attempt to capture the complexity of the system in which we interpret porous soils as heterogeneous networks, where pores are represented by nodes and the links representing flows between them. Pore properties such as position and size are described by fixed states in a metric space, while an affinity function is introduced to bias the attachment probabilities of links according to these properties taking in account soil texture. These types of models are named as Heterogeneous Preferential Attachment (HPA). We perform an analytical study of the degree distributions in the soil model and show that under reasonable conditions all the model variants yield a multiscaling behavior in the connectivity degrees, leaving an empirically testable signature of heterogeneity in the topology of pore networks. With the aim to study in more detail topological properties of these networks, for different real soils samples an analysis of the community structure have been applied and studied depending on the values of the parameters of the porous soil model used. The detection of communities of pores, as groups densely connected with only sparser connections between groups, could contribute to understand the mechanisms of the diffusion phenomena in soils. | |
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Internacional
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Si |
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Nombre congreso
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AGU Fall Meeting 2011 |
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Tipo de participación
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960 |
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Lugar del congreso
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San Francisco, USA |
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Revisores
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Si |
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ISBN o ISSN
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0096-3941 |
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DOI
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Fecha inicio congreso
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05/12/2011 |
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Fecha fin congreso
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09/12/2011 |
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Desde la página
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Hasta la página
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1501 |
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Título de las actas
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AGU Fall Meeting Abstracts Vol. A |