Characteristics of Infiltration Recharge at Thickening Vadose Zone Using Soil Hydraulic Parameters
Lin Dan
Jin Menggui
Ma Bin
Wang Bingguo
Abstract：Ten undisturbed soil samples were collected from deep vadose zone (8.0 -21.0 m)at Zhengding,Hebei,and ana-lyzed to study how thickening vadose zone impacts the infiltration recharge processes.These samples were measured by Pres-sure Plate Extractor to gain the soil retention curves,which were fitted by Mualem-van Genuchten Model using RETC soft-ware.Unsaturated hydraulic conductivity and the relation curves were obtained through the curve-fitting processes.The impact on the infiltration recharge processes at the thickening vadose zone is discussed according the Darcy’s equation.It is concluded that the unsaturated hydraulic conductivities at sampling time were 25-240 mm/a at the depth of 8.0-21.0 m.If the velocity of water table decline was fast at a certain depth historically,the unsaturated conductivities with same water content should also have large values,which shows the soil has large infiltration capacity.Soil hydraulic parameters and infiltration capacities would change because of water table fluctuated-declining and drainage consolidation,which would impact vertical infiltration recharge.
Keywords：deep vadose zonesoil water characteristic curverecharge intensityRETCDarcy’s equationsoil conditionsgroundwater
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 760-768 )