Experimental verification of two calculation methods for relating horizontal infiltration to soil-water diffusivity

Pal, Raj; Stroosnijder, L.

doi:10.1016/0016-7061(76)90045-8

Cited by 2 publications

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“…Balasubramanian et al (1976), on the other hand, did not find any appreciable effect of initial moisture content on D(6) in aggregated soils. Pal & Stroosnijder (1976) observed an increase in D(6) with an increase in initial moisture content in Blokzijl sand but not in loess. Gumbs & Warkentin (1975) reported that, in general, at any given moisture content, the larger the aggregate size the greater the value of D{d).…”

Section: Introductionmentioning

confidence: 75%

Unsaturated water transmission characteristics of soils in relation to texture, aggregate size and initial moisture content

et al. 1989

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S U M M A R YTo study the effect of soil texture, aggregate size and initial moisture content on soil water diffusivity, D{0), and unsaturated hydraulic conductivity, K{6), horizontal absorption experiments were conducted on samples of loamy sand, sandy loam and clay-loam soils as well as on artificially prepared water-stable aggregates of a clay-loam sample (sizes 0-125-0-25, 0-25-0-5, 0-5-1, 1-2, and 2-4 mm). For comparable moisture contents, D(&) followed the order loamy sand > sandy loam > clay-loam. The effect of initial moisture content on D{6) varied with soil texture. K{0), which was evaluated using D(6) for air-dry initial moisture content and the slopes of the water retention curves, also varied with soil texture.The D(6) function for air-dry initial moisture content increased with the decrease in aggregate size, the increase being more pronounced below a size of 1 mm. Values of D(6) obtained from initially airdry soil and at 10 % of saturation moisture content did not differ greatly from one another. The K(d) function was almost the same for aggregate sizes 1-2 and 2-4 mm. In the size ranges of < 1 mm, K(d) increased with the decrease in aggregate size. The particle/aggregate size range of 0-1-0-5 mm was the most conducive to unsaturated water flow.

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Section: Introductionmentioning

confidence: 75%