Analytical model of infiltration under constant surface ponding

Dimetre Triadis; Philip Broadbridge

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arXiv · 2104.15009

Analytical model of infiltration under constant surface ponding

Dimetre Triadis·Philip Broadbridge

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Abstract

An analytical solution of the nonlinear Richards equation is presented, for one-dimensional infiltration into a soil of uniform initial moisture content subject to a constant depth of surface ponded water. Adopted mathematical forms of the soil water diffusivity and conductivity are flexible enough to model a range of real soils. The solution takes the form of a power series in $\sqrt t$, but is observed to converge not only for small times but also for relatively large times at which travelling-wave-like behavior is evident. The solution is used to tabulate exact infiltration coefficients with higher-order corrections as the natural nonlinear limit of soil properties is approached. Previously published approximate solutions that apply for a wide range of soil properties are tested against the exact solution and found to be sufficiently accurate.

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Dimetre Triadis, Philip Broadbridge. 2021-04-16. Analytical model of infiltration under constant surface ponding. https://arxiv.org/abs/2104.15009

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