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

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

Description

Title: Percolation in soils at Different Bulk Densities: Porosity, Connectivity and Grey Threshold.
Author/s:
  • Tarquis Alfonso, Ana Maria
  • Ruiz Ramos, Margarita
  • Baveye, Philippe
  • Valle, Daniel del
Item Type: Presentation at Congress or Conference (Unspecified)
Event Title: ABSTRACT FINAL ID: H51H-1303;
Event Dates: 05/12/2011 - 09/12/2011
Event Location: San Francisco (California)
Date: 2011
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Matemática Aplicada a la Ingeniería Agronómica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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.

More information

Item ID: 13551
DC Identifier: http://oa.upm.es/13551/
OAI Identifier: oai:oa.upm.es:13551
Deposited by: Memoria Investigacion
Deposited on: 17 Oct 2012 08:45
Last Modified: 21 Apr 2016 12:52
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