Abstract
ABSTRACT The Philip-Dunne falling-head infiltration for determining the parameters of soil water movement is a relatively simple procedure, yet the calculation is still complicated. This study develops a simplified method for determining soil saturated hydraulic conductivity ks and Green-Ampt wetting front suction ψ. Field Philip-Dunne infiltration tests are performed in a loam soil under different initial head heights (30, 40, and 50 cm) at 45 test points. The relationship between infiltration time ti and the parameters ks and ψ is explored. The results show that Δθ within the range of 0.015–0.147 has little influence on ks or ψ in the test soil, and prediction of the two parameters using mean Δθ meets the accuracy requirements. ks is significantly negatively correlated with ti and best predicted by 1/tmed ; the prediction accuracy of the linear function is strongly influenced by the initial head height h0 . There is a significant relationship between ψ and tmax /tmed , and h0 has little influence on the prediction accuracy of the power function. Therefore, the simplified models based on 1/tmed and tmax /tmed can be used for field-scale determination of the parameters ks and ψ in loam soil, with an overall error below 10%.
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Schedule a callMore From: Acta Agriculturae Scandinavica, Section B — Soil & Plant Science
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