Figure 8.

Estimation of the soil hydraulic parameters from data at the location close to the middle of the hill in site 2 (i.e., Nodes 2282 and 2292, and data logger DL2). Wetness, s, in blue; Estimated wetness from measured matric water potential (WP) using the Clapp and Hornberger, and van Genuchten equations, in green and red, respectively. (a) Comparison of the wetness, s, time series, at a depth of 10 cm; (b) Same as part a, for a depth of 30 cm; (c) Relationship between the soil wetness, s, and the absolute value of the WP, in kPa, |$\psi$| at a depth of 10 cm. The fitted Clapp and Hornberger equation is shown in green and the fitted van Genuchten equation in red; (d) Same as part c, for a depth of 30 cm.