How to translate text using browser tools
2 July 2020 Analysis of spatial variability of soil water retention using the cumulative distribution function matching
Nizami Gummatov, Yakov A. Pachepsky
Author Affiliations +
Abstract

The importance of modeling dependencies of spatial variability of soil water content on soil matric potential grows due to the proliferation of ensemble modeling, data assimilations, and other soil water modeling applications. The objective of this work was to investigate conversions between cumulative distribution functions of water contents at different matric potentials. In total, 80 samples were taken in the nodes of the grid to measure soil water retention using sand and sand–kaolin capillarimeters at absolute values of soil matric potential of 0.001, 0.003, 0.010, 0.020, and 0.050 MPa, and with the water vapor desorption method at 3, 21, 39, 82, and 142 MPa. The probabilities of distributions of both non-transformed and log-transformed soil water contents being normal appeared to be larger than 0.05 in most cases. Using the probit function to represent the observed variability allowed us to match cumulative probability distributions at different soil water potentials. Slopes of dependencies of probits on non-transformed and log-transformed water contents had one-parametric linear dependencies on the logarithms of the absolute value of soil matric potential in capillary and adsorptive potential ranges.

Copyright remains with the author(s) or their institution(s). Permission for reuse (free in most cases) can be obtained from copyright.com.
Nizami Gummatov and Yakov A. Pachepsky "Analysis of spatial variability of soil water retention using the cumulative distribution function matching," Canadian Journal of Soil Science 101(1), 84-90, (2 July 2020). https://doi.org/10.1139/cjss-2019-0130
Received: 18 October 2019; Accepted: 4 May 2020; Published: 2 July 2020
JOURNAL ARTICLE
7 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

KEYWORDS
capillarimeter
probit
soil water
spatial variability
vapor desorption
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top