RefDoc
Haut

Faire une nouvelle recherche
Make a new search
Lancer la recherche


Titre du document / Document title

Effect of compaction on soil physical and hydraulic properties : Experimental results and modeling

Auteur(s) / Author(s)

ASSOULINE S. (1) ; TAVARES J. FILHO (2) ; TESSIER D. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) I.N.R.A. Centre de Recherches de Versailles. Unite de science du sol, Route de St-Cyr, 78026 Versailles, FRANCE
(2) Universidade Estadual de Londrina, CCA-Agronomia, Londrina, BRESIL

Résumé / Abstract

Soil compaction affects soil physical properties and, eventually, crop production. A severe drop in the productivity of the state of Parana, southern Brazil, was observed due to soil compaction. Two oxisols from this region, a Haplic Acrothox from the site of Cascavel and a Haplic Eutrothox from the site of Palotina, presenting different compaction behaviors in the field, are studied under laboratory conditions. Uniaxial compressive pressures, from 50 to 1000 kPa, are applied to soil samples at different initial matric potentials, varying from -0.1 to -1000 kPa. The bulk density of the Palotina soil is always higher than that of the Cascavel soil and is the highest when the initial matric tension is -32 kPa. Differences in pH, cation-exchange capacity, organic matter, and clay particle thickness also tend to explain the different compaction behaviors. A model of the soil bulk density increase during compaction is proposed and compared with a multiplicative model and a logarithmic model. The performances of the proposed and the multiplicative models are practically similar and better than those of the logarithmic model. The major advantage of the proposed model is that it has one fitting parameter less than the multiplicative model. Compaction affects the soil water retention curves for the whole range of matric tensions, up to - 100 MPa. An approach that allows the evaluation of the hydraulic conductivity functions of the compacted samples is proposed. Applied to the Brooks and Corey relationship, the main drying curves of the compacted samples are well reproduced using one fitting parameter only.

Revue / Journal Title

Soil Science Society of America journal    ISSN  0361-5995   CODEN SSSJD4 

Source / Source

1997, vol. 61, no2, pp. 390-398 (46 ref.)

Langue / Language

Anglais

Editeur / Publisher

Soil Science Society of America, Madison, WI, ETATS-UNIS  (1976) (Revue)

Mots-clés anglais / English Keywords

Property of soil

;

Compaction

;

Hydraulic conductivity

;

Dynamic model

;

Hydraulic model

;

Mathematical model

;

Modeling

;

Hydraulic properties

;

Physical properties

;

Retention

;

Brazil

;

Tropical soil

;

Laboratory study

;

Model study

;

South America

;

America

;

Applied physics

;

Soil science

;

Oxisols

;

Mots-clés français / French Keywords

Caractéristique sol

;

Compactage

;

Conductivité hydraulique

;

Modèle dynamique

;

Modèle hydraulique

;

Modèle mathématique

;

Modélisation

;

Propriété hydraulique

;

Propriété physique

;

Rétention

;

Brésil

;

Sol tropical

;

Etude en laboratoire

;

Etude sur modèle

;

Acrothox haplique

;

Eutrothox haplique

;

Amérique du Sud

;

Amérique

;

Physique appliquée

;

Science du sol

;

Oxisol

;

Mots-clés espagnols / Spanish Keywords

Característica suelo

;

Compactación

;

Conductividad hidráulica

;

Modelo dinámico

;

Modelo hidraúlico

;

Modelo matemático

;

Modelización

;

Propiedad hidráulica

;

Propiedad física

;

Retención

;

Brasil

;

Suelo tropical

;

Estudio en laboratorio

;

Estudio sobre modelo

;

America del sur

;

America

;

Física aplicada

;

Ciencia del suelo

;

Oxisols

;

Localisation / Location

INIST-CNRS, Cote INIST : 6109, 35400006551593.0050

Nº notice refdoc (ud4) : 2703053



Faire une nouvelle recherche
Make a new search
Lancer la recherche
Bas