Journal article

New approximate analytical technique to solve Richards equation for arbitrary surface boundary conditions

A general approximation for the solution to the one- dimensional Richards equation is presented. It applies to arbitrary soil properties and boundary conditions but only uniform initial conditions at current stage. The result is very accurate (within 2%) when the diffusivity is constant, suggesting that the present general formulation is reliable, since the approximation becomes increasingly accurate as the soil-water diffusivity approaches a delta function.


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