A comparison of estimated and calculated effective porosity

A comparison of estimated and calculated effective porosity

Effective porosity in solute-transport analyses is usually estimated rather than calculated from tracer tests in the field or laboratory. Calculated values of effective porosity in the laboratory on three different textured samples were compared to estimates derived from particle-size distributions...

Full description

Saved in:
Bibliographic Details
Published in:Hydrogeology journal Vol. 6; no. 1; pp. 156 - 165
Main Authors: Stephens, Daniel B, Hsu, Kuo-Chin, Prieksat, Mark A, Ankeny, Mark D, Blandford, Neil, Roth, Tracy L, Kelsey, James A, Whitworth, Julia R
Format: Journal Article
Language:English
Published: Heidelberg Springer Nature B.V 01-06-1998
Subjects:
Aquifer testing
Aquifers
Calibration
Chemical transport
Effective porosity
Estimates
Geochemistry
Gravel
Groundwater flow
Hydrology
Mathematical models
Moisture
Moisture content
Porosity
Soil water
Tracers
Transport
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Effective porosity in solute-transport analyses is usually estimated rather than calculated from tracer tests in the field or laboratory. Calculated values of effective porosity in the laboratory on three different textured samples were compared to estimates derived from particle-size distributions and soil-water characteristic curves. The agreement was poor and it seems that no clear relationships exist between effective porosity calculated from laboratory tracer tests and effective porosity estimated from particle-size distributions and soil-water characteristic curves. A field tracer test in a sand-and-gravel aquifer produced a calculated effective porosity of approximately 0.17. By comparison, estimates of effective porosity from textural data, moisture retention, and published values were approximately 50-90% greater than the field calibrated value. Thus, estimation of effective porosity for chemical transport is highly dependent on the chosen transport model and is best obtained by laboratory or field tracer tests.Original Abstract: La porosite effective dans les analyses de transport de solute est habituellement estimee, plutot que calculee a partir d'experiences de tracage sur le terrain ou au laboratoire. Les valeurs calculees de la porosite effective au laboratoire sur trois echantillons de textures differentes ont ete comparees aux estimations provenant de distributions de taille de particules et de courbes caracteristiques sol-eau. La concordance etait plutot faible et il semble qu'il n'existe aucune relation claire entre la porosite effective calculee a partir des experiences de tracage au laboratoire et la porosite effective estimee a partir des distributions de taille de particules et de courbes caracteristiques sol-eau. Une experience de tracage de terrain dans un aquifere de sables et de graviers a fourni une porosite effective calculee d'environ 0,17. En comparaison, les estimations de porosite effective de donnees de texture, de teneur en eau et les valeurs publiees etaient environ 50 a 90% plus fortes que la valeur calibree sur le terrain. Ainsi, l'estimation de la porosite effective pour le transport en solution depend fortement du modele de transport utilise et est preferable lorsqu'elle est obtenue a partir d'experiences de tracage de laboratoire ou de terrain.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1431-2174
1435-0157
DOI:10.1007/s100400050141