天津大学学报(英文版)
天津大學學報(英文版)
천진대학학보(영문판)
TRANSACTIONS OF TIANJIN UNIVERSITY
2014年
6期
463-468
,共6页
姜建梅%赵林%齐云%翟喆
薑建梅%趙林%齊雲%翟喆
강건매%조림%제운%적철
shallow groundwater%matric potential%thermal hydraulic conductivity%isothermal hydraulic conductivity
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 were measured for 5 d. Soil hydraulic properties were analyzed by using the Philips and de Vries model. Results showed that evaporation mainly influenced the matric potential of the shallow layer at the 5 cm depth regardless of the satura-tion of the layer. Groundwater recharge mainly affected soil moisture at the depth of 20 cm or more. A constant matric potential 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 the dominant 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 peak values of KvT were 2.7×10-7, 2.4×10-7 and 1.8 ×10-7m/s, respectively.