PROBLEM TO BE SOLVED: To obtain the concn. distribution of a substance required for the activity of microorganism in the ground at the time of supplying this substance to the microorganisms by infiltrating a soln. of this substance into the ground. ;SOLUTION: A first analytical means 32 solves a differential equation with respect to water head by a finite element method by using data on the coefft. tensor of permeability of the ground fetched by a first input means 30 to obtain the water head in the ground. A second analyzing means 34 computes the flow velocity vector of the soln. in the ground from the results thereof. Thereafter, a third analyzing means 38 solves a differential equation with respect to the concn. of nutrient salt in the ground by using the soln. diffusion coefft., etc., in the ground fetched by the second input means 36 and the flow velocity vector computed by the second analyzing means 34. An output means 40 displays the concn. distribution on the screen of a CRT monitor in accordance with the analytical results of the concn. by the third analyzing means 38.;COPYRIGHT: (C)1999,JPO
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