Untitled research work

To understand the influence of pore air on rainfall infiltration and seepage, the results of numerical simulation of two-phase flow through porous medium were compared with the results of usual saturated-unsaturated seepage simulation which ignored pore-air flow. It was shownthat when ground surface was under the ponded condition a rise in pore-air pressure due to infiltration caused the increase of amount of water seeping out of ground to under-drain. Air flow seepingout of ground reduced the infiltration rate. When ground surface was in non-ponded condition, the degree of pore-air influence highly depended on hydraulic conductivity and size of seepage flow field.