Abstract
The effects of spatial variability and human factors on soil lead to complex soil hydraulic properties. In areas with highly variable water levels, it is impossible to use analytic expressions to accurately quantify and describe the process of moisture transport. In this study, the HYDRUS software package was used to calculate and simulate soil moisture transport under variable water levels by analyzing soil and underground water as an integrated system, and conducting in-situ monitoring tests on a large indoor soil trough. The results showed that: (1) the initial model verification achieved by adjusting the groundwater level revealed that when the groundwater dropped, the soil moisture in the vadose zone transitioned from balanced to unbalanced to balanced again; (2) the values and development trends of the negative pressure and water content of the soil as calculated by the model using adjusted parameters were consistent with those of the measured result, which indicated that the moisture transport model established in the GSPAC system was credible; and (3) the model established by the HYDRUS software package was able to effectively predict the soil moisture transport and infiltration dynamics.
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