Percolation in soils at Different Bulk Densities: Porosity, Connectivity and Grey Threshold.

Tarquis Alfonso, Ana Maria; Ruiz Ramos, Margarita; Baveye, Philippe y Valle, Daniel del (2011). Percolation in soils at Different Bulk Densities: Porosity, Connectivity and Grey Threshold.. En: "ABSTRACT FINAL ID: H51H-1303;", 05/12/2011 - 09/12/2011, San Francisco (California). p. 1.

Descripción

Título: Percolation in soils at Different Bulk Densities: Porosity, Connectivity and Grey Threshold.
Autor/es:
  • Tarquis Alfonso, Ana Maria
  • Ruiz Ramos, Margarita
  • Baveye, Philippe
  • Valle, Daniel del
Tipo de Documento: Ponencia en Congreso o Jornada (Sin especificar)
Título del Evento: ABSTRACT FINAL ID: H51H-1303;
Fechas del Evento: 05/12/2011 - 09/12/2011
Lugar del Evento: San Francisco (California)
Fecha: 2011
Materias:
Escuela: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Departamento: Matemática Aplicada a la Ingeniería Agronómica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

To improve percolation modelling on soils the geometrical properties of the pore space must be understood; this includes porosity, particle and pore size distribution and connectivity of the pores. A study was conducted with a soil at different bulk densities based on 3D grey images acquired by X-ray computed tomography. The objective was to analyze the effect in percolation of aspects of pore network geometry and discuss the influence of the grey threshold applied to the images. A model based on random walk algorithms was applied to the images, combining five bulk densities with up to six threshold values per density. This allowed for a dynamical perspective of soil structure in relation to water transport through the inclusion of percolation speed in the analyses. To evaluate separately connectivity and isolate the effect of the grey threshold, a critical value of 35% of porosity was selected for every density. This value was the smallest at which total-percolation walks appeared for the all images of the same porosity and may represent a situation of percolation comparable among bulks densities. This criterion avoided an arbitrary decision in grey thresholds. Besides, a random matrix simulation at 35% of porosity with real images was used to test the existence of pore connectivity as a consequence of a non-random soil structure.

Más información

ID de Registro: 13551
Identificador DC: http://oa.upm.es/13551/
Identificador OAI: oai:oa.upm.es:13551
Depositado por: Memoria Investigacion
Depositado el: 17 Oct 2012 08:45
Ultima Modificación: 21 Abr 2016 12:52
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