Masurement And Analysis On Numerical Simulation Of Soil Hydraulic Properties

This thesis was supported by a project founded by the NSFC, titled "Scale-Dependency and Spatial Variability of Soil Hydraulic Properties". The main objective was to study soil hydraulic properties using theoretical analysis and experiments. Summarizing related research about the principles of calculating soil hydraulic parameters, we developed an apparatus to measure the soil retention function at lower suctions. To study spatial variability of soil hydraulic properties, a field experiment was conducted to measure infiltration processes at 100 locations using the disc infiltrometer. The measured data and computer simulations of infiltration processes were used to calculate the soil unsaturated hydraulic conductivity and macro capillary length. Various methods were applied for the calculations, from which advantages and disadvantages of the methods were analyzed. Based on the analysis, a new procedure was proposed, which provided more accurate estimation results of soil hydraulic properties based on disc infiltrometer data.