| Citation: | JIN Yu，CHEN Wenling，WANG Mingsen，et al. Dynamic law of suction during the evaporation process of saline soil based on dew point water potential meter and filter paper method[J]. Bulletin of Geological Science and Technology，2025，44（6）：270-280 doi: 10.19509/j.cnki.dzkq.tb20240065
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In order to obtain total suction, matric suction and osmotic suction during the evaporation process of saline soil, the dynamic variation characteristics of each suction force under different water and salt conditions and its influence on evaporation were clarified.
A combination of a cold mirror dew point water potential meter and a parallel contact filter paper method was employed to analyze the dynamic processes of total suction, matric suction, and osmotic suction during soil evaporation with different salt contents, as well as their effects on soil evaporation. Four commonly used soil water characteristic curve models were selected, and the relationship between matric suction and water content was fitted by SWRC-Fit package.
The results indicate that the proportion of matric suction and osmotic suction to total suction continuously changes during the evaporation process of saline soil, with the latter always being higher than the former. Both moisture content and salinity affect the magnitude of soil osmotic suction, with salinity showing a more significant impact. The intensity and duration of soil evaporation are both affected by soil salinity.
Total suction, matric suction and osmotic suction in unsaturated soil during the evaporation process can be simultaneously obtained by WP4C and parallel contact filter paper method. The Fredlund and Xing model accurately fits the experimental data, maintaing good fitting accuracy throughout all evaporation stages, which further proves the reliability of the experimental method and data.
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