閉塞浸透における不飽和域の解析

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タイトル別名
  • ANALYSIS ON UNSATURATED ZONE IN CONFINED INFILTRATION
  • ヘイソク シントウ ニ オケル フホウワイキ ノ カイセキ

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A large fraction of the water falling as rain on the land surface moves through unsaturatedsoil during the subsequent process of infiltration. Then if the air initially in the soil is not free toescape as it is displaced by water, the dynamics of process on infiltration of water becomes verycomplicated.In order to clarify such a infiltration mechanism, the experiments of pounded infiltration havecarried out by using sand column in the lucite cylinder with bottom plate.After confirming by the results of experiment that the movement of water or air in the neigh-bourhood of wetting front obeyes each generalized Darcy's law in the sense of Muskat, the analyticalsolutions on the flow equations, which are derived for unsaturated zone by combining generalizedDarcy's law, mass conservation law for both immiscible fluids and equation of state for gas, werededuced by using modified Parlange method. And by comparing the solutions with the results ofexperiment, it was found that both are fit approximately. So, the movements of both fluids arenearly obeyed generalized Darcy's law for unsaturated zone, excluding nearly saturated zone, which appears in the neighbourhood of sand surface and in which the mechanism of water infil-tration and air escape is not clear here.

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