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Fig. 11. Dependence of the roughness parameter h on the volumetric water content ${theta}$ _2,_t measured at the 2-cm depth for the two periods ${tau}$ ₁ and ${tau}$ ₂ (solid lines). The dashed lines show h values for ${tau}$ ₁ and ${tau}$ ₂ averaged over the measured water content range. The calculated ${sigma}$ corresponding to h during ${tau}$ ₁ or ${tau}$ ₂ are indicated on the right axis. These values are of the same order as the optically measured values ${sigma}$ _opt shown in Table 1.