Small-scale contact angle mapping on undisturbed soil surfaces

Research of the last years pointed out that most soils are neither completely hydrophilic nor hydrophobic, but exhibit a subcritical level of water repellency (i.e. contact angle, CA > 0 degrees and 300 mu m using drop volumes down to 0.1 mu L. Geostatistical evaluation showed that the measurement grid scale is below the range of spatial dependency for droplets of 1 mu L volume, but not for measurements on single grains (pure nugget effect). Results show further that the small-scale differences in wettability, especially for CA < 90 degrees, cannot be detected by the conventional WDPT test. From these findings it can be concluded that the proposed technique allows the identification of small-scale variations in wettability that may promote the formation of heterogeneous flow fields and moisture patterns in soil under unsaturated conditions.DFG/SPP/1315DFG/BA1359/9-