Groundwater recharge significantly affects soil moisture redistribution through capillary rise. In this study,the soil matric potential at depths of 5, 10, 20 and 30 cm above the groundwater tables of 10, 30 and 60 cm...Groundwater recharge significantly affects soil moisture redistribution through capillary rise. In this study,the soil matric potential at depths of 5, 10, 20 and 30 cm above the groundwater tables of 10, 30 and 60 cm weremeasured for 5 d. Soil hydraulic properties were analyzed by using the Philips and de Vries model. Results showedthat evaporation mainly influenced the matric potential of the shallow layer at the 5 cm depth regardless of the saturationof the layer. Groundwater recharge mainly affected soil moisture at the depth of 20 cm or more. A constant matricpotential layer existed between the evaporation front and capillary rise front where moisture content did not change.The isothermal-liquid hydraulic conductivity （KLh） and the thermal-vapor hydraulic conductivity （KvT） were thedominant hydraulic conductivities in the liquid and vapor phases. At the groundwater table depths of 10, 30 and 60 cm,the mean peak values of KLh were 2.32×10^-7, 1.63×10^-7 and 0.29×10^-7 m/s, respectively, whereas the mean peakvalues of KvT were 2.7×10^-7, 2.4×10^-7 and 1.8 ×10^-7m/s, respectively.展开更多
基金Supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China(No.2012BAC07B02)
文摘Groundwater recharge significantly affects soil moisture redistribution through capillary rise. In this study,the soil matric potential at depths of 5, 10, 20 and 30 cm above the groundwater tables of 10, 30 and 60 cm weremeasured for 5 d. Soil hydraulic properties were analyzed by using the Philips and de Vries model. Results showedthat evaporation mainly influenced the matric potential of the shallow layer at the 5 cm depth regardless of the saturationof the layer. Groundwater recharge mainly affected soil moisture at the depth of 20 cm or more. A constant matricpotential layer existed between the evaporation front and capillary rise front where moisture content did not change.The isothermal-liquid hydraulic conductivity （KLh） and the thermal-vapor hydraulic conductivity （KvT） were thedominant hydraulic conductivities in the liquid and vapor phases. At the groundwater table depths of 10, 30 and 60 cm,the mean peak values of KLh were 2.32×10^-7, 1.63×10^-7 and 0.29×10^-7 m/s, respectively, whereas the mean peakvalues of KvT were 2.7×10^-7, 2.4×10^-7 and 1.8 ×10^-7m/s, respectively.
