A NUMERICAL METHOD TO JOINT THE SATURATED AND THE UNSATURATED GROUND WATER FLOW

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  • 鉛直不飽和浸透流計算における飽和域・不飽和域の接合に関する数学的処理について
  • エンチョク フホウワ シントウリュウ ケイサン ニ オケル ホウワイキ フホウ

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A numerical model for a simulation of unsaturated ground water flow in vertical is developed with a special attention to the strict formulation of the motion of a boundary between the saturated region and the unsaturated region: An iso-parametric element on T(time) -Z(space) plane is introduced so that the boundary is always coincident with a nodal point of finite element method. As a result, the numerical errors caused by the coexistence of saturated and unsaturated regions in one element is eliminated. The model produces a ground water flow field with high accuracy even with a space increment far lager than that of the existing models.

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