Memorias de investigación
Ponencias en congresos:
Percolation in soils at Different Bulk Densities: Porosity, Connectivity and Grey Threshold.
Año:2011
Áreas de investigación
  • Ciencia del suelo,
  • Agricultura
Datos
Descripción
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.
Internacional
Si
Nombre congreso
The American Geophysical Union Fall Meeting 2011
Tipo de participación
960
Lugar del congreso
San Francisco (California)
Revisores
Si
ISBN o ISSN
00000000
DOI
Fecha inicio congreso
05/12/2011
Fecha fin congreso
09/12/2011
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1
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1
Título de las actas
ABSTRACT FINAL ID: H51H-1303;
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Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Centro o Instituto I+D+i: Centro de Estudios e Investigación para la Gestión de Riesgos Agrarios Medioambientales (CEIGRAM)
  • Departamento: Producción Vegetal: Fitotecnia
  • Departamento: Matemática Aplicada a la Ingeniería Agronómica