Determination of hydraulic properties of a tropical soil of hawaii using column experiments and inverse modeling
Result description
A method for determining soil hydraulic properties of a weathered tropical soil (Oxisol) using a medium-sized column with undisturbed soil is presented. The method was used to determine fitting parameters of the water retention curve and hydraulic conductivity functions of a soil column in support of a pesticide leaching study. Column was examined by computed tomography. The experiment was based on tension infiltration into the soil column with free outflow at the lower end. Water flow through the soilcore was mathematically modeled using a computer code that solves the one-dimensional Richards equation. The inverse modeling produced very good agreement between model outputs and measured flux and pressure head data for the relatively homogeneous column. The moisture content at a given pressure from the retention curve measured directly in small soil samples was lower than that obtained through parameter optimization based on experiments using a medium-sized undisturbed soil column.
Keywords
DISC INFILTROMETERHETEROGENEOUS SOILENTRAPPED AIRSTEADY-STATECONDUCTIVITYINFILTRATIONFLOWTOMOGRAPHYTRANSPORTEQUATION
The result's identifiers
Result code in IS VaVaI
Result on the web
http://www.scielo.br/scielo.php?pid=S0100-06832011000400016&script=sci_arttext
DOI - Digital Object Identifier
—
Alternative languages
Result language
angličtina
Original language name
Determination of hydraulic properties of a tropical soil of hawaii using column experiments and inverse modeling
Original language description
A method for determining soil hydraulic properties of a weathered tropical soil (Oxisol) using a medium-sized column with undisturbed soil is presented. The method was used to determine fitting parameters of the water retention curve and hydraulic conductivity functions of a soil column in support of a pesticide leaching study. Column was examined by computed tomography. The experiment was based on tension infiltration into the soil column with free outflow at the lower end. Water flow through the soilcore was mathematically modeled using a computer code that solves the one-dimensional Richards equation. The inverse modeling produced very good agreement between model outputs and measured flux and pressure head data for the relatively homogeneous column. The moisture content at a given pressure from the retention curve measured directly in small soil samples was lower than that obtained through parameter optimization based on experiments using a medium-sized undisturbed soil column.
Czech name
—
Czech description
—
Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DA - Hydrology and limnology
OECD FORD branch
—
Result continuities
Project
Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Revista Brasileira de Ci?ncia do Solo
ISSN
0100-0683
e-ISSN
—
Volume of the periodical
35
Issue of the periodical within the volume
4
Country of publishing house
BR - BRAZIL
Number of pages
11
Pages from-to
1229-1239
UT code for WoS article
000295854500016
EID of the result in the Scopus database
—
Basic information
Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
DA - Hydrology and limnology
Year of implementation
2011