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UNSODA 2.0: Unsaturated Soil Hydraulic Database. Database and program for indirect methods of estimating unsaturated hydraulic properties
dataset
posted on 2024-02-08, 18:17 authored by Attila Nemes, Marcel Schaap, Feike J. Leij, J. Henk M. WöstenThis database contains measured soil water retention, hydraulic conductivity, and water diffusivity data, as well as pedological information of some 790 soil samples from around the world.
Quantifying water flow and chemical transport in the vadose zone typically requires knowledge of the unsaturated soil hydraulic properties. The UNsaturated SOil hydraulic DAtabase (UNSODA) was developed to provide a source of unsaturated hydraulic data and some other soil properties for practitioners and researchers. A first MS-DOS version of the database was released in 1996. It has been applied in numerous studies. In this paper, we describe the second version (UNSODA V2.0) for use with Microsoft Access-97®1. The format and structure of the new database have been modified to provide additional and more convenient options for data searches, to provide compatibility with other programs for easy loading and downloading of data, and to allow users to customise the contents and look of graphical output. This paper reviews the structure and contents of the database as well as the operations that can be performed on the different data types in UNSODA V2.0. The use and application of the new database are illustrated with two examples. The retrieval of data is briefly illustrated, followed by a more detailed example regarding the interpolation of soil particle-size distribution data obtained according to different national definitions of particle-size classes. The interpolation procedure, which is based on finding similar particle-size distribution curves from a large European data set, also performed well for soils that originate from other geographical areas.
Resources in this dataset:
Resource Title: UNSODA 2.0 README.
File Name: UNSODA 2.0 README.pdf
Resource Title: UNSODA 2.0 zip package.
File Name: unsoda.ZIP
Resource Description: Contains a README file and Microsoft Access database. Files added to original record on June 8, 2020.
Funding
USDA-ARS
History
Data contact name
Skaggs, ToddData contact email
todd.skaggs@ars.usda.govPublisher
US Salinity Laboratory - ARS - USDATemporal Extent Start Date
1999-01-01Theme
- Not specified
Geographic Coverage
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location - description
EarthISO Topic Category
- environment
National Agricultural Library Thesaurus terms
databases; diffusivity; hydraulic conductivity; particle size distribution; soil water retention; vadose zone; models; computer softwareOMB Bureau Code
- 005:18 - Agricultural Research Service
OMB Program Code
- 005:040 - National Research
ARS National Program Number
- 211
Pending citation
- No
Public Access Level
- Public