An Empirical Function to Describe Measured Water Distributions From Horizontal Infiltration Experiments

dc.contributor.author McBride, John
dc.contributor.author Horton, Robert
dc.contributor.author Horton, Robert
dc.contributor.department Agronomy
dc.date 2018-01-31T18:17:06.000
dc.date.accessioned 2020-06-29T23:05:11Z
dc.date.available 2020-06-29T23:05:11Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 1985
dc.date.issued 1985-10-01
dc.description.abstract <p>To determine the soil water diffusivity, <em>D(θ)</em>, by the horizontal infiltration method of R. R. Bruce and A. Klute (1956) the slope of the water distribution curve and the area under the curve must be evaluated. Experimental data often exhibit scatter, thus making the evaluation of the slope difficult. In this paper a rapid, simple method is described that introduces an empirical function that by linear least squares regression yields a curve that fits water distribution data for a wide range of soil textures. The function is differentiable, and its integral is easily calculated with a numerical technique available on programmable scientific calculators. The proposed method produces estimates of <em>D(θ)</em> that reach expected large values near water saturation. This result offers a clear advantage over other simple methods that assume an exponential relation between <em>D</em> and <em>θ</em> and thus describe <em>D(θ)</em> adequately only over the middle range of water contents.</p>
dc.description.comments <p>This article is published as McBride, John F., and Robert Horton. "An empirical function to describe measured water distributions from horizontal infiltration experiments." <em>Water Resources Research</em> 21, no. 10 (1985): 1539-1544. doi; <a href="http://dx.doi.org/10.1029/WR021i010p01539" target="_blank">10.1029/WR021i010p01539</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/431/
dc.identifier.articleid 1477
dc.identifier.contextkey 11453102
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/431
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4789
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/431/1985_Horton_EmpiricalFunction.pdf|||Sat Jan 15 00:15:36 UTC 2022
dc.source.uri 10.1029/WR021i010p01539
dc.subject.disciplines Agriculture
dc.subject.disciplines Hydrology
dc.subject.disciplines Soil Science
dc.subject.disciplines Statistical Methodology
dc.title An Empirical Function to Describe Measured Water Distributions From Horizontal Infiltration Experiments
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication d3fb0917-6868-417e-9695-a010896cfafa
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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