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In addition to the domain size, two different slope magnitudes were considered: 10 and 30 °. Homogeneous soil with loamy sand texture was adopted, assuming the van Genuchten–Mualem soil hydraulic model (van Genuchten 1980) (see Table 1 for soil hydraulic parameters based on the Carsel and Parrish soil catalog; Carsel & Parrish 1988). Hysteresis in the soil hydraulic functions was not considered. Simulations were initialized with uniformly distributed soil moisture at either θi = 0.07 or θi = 0.26. With loamy sand texture, these soil water contents correspond to pressure head h = –1 m and h = –0.1 m, respectively.

Table 1

Soil hydraulic properties for the loamy sand, assuming the van Genuchten–Mualem soil hydraulic model. The parameters were taken from the soil catalog by Carsel & Parrish (1988) 

θr (m3 m–3)θs (m3 m–3)α (m–1)n (–)ks (m h–1)
Loamy sand 0.057 0.41 12.4 2.28 0.1459 
θr (m3 m–3)θs (m3 m–3)α (m–1)n (–)ks (m h–1)
Loamy sand 0.057 0.41 12.4 2.28 0.1459 

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