抄録
Computer memory saving algorithm for inverse analysis of heterogeneous hydraulic property was developed. Inversion for heterogeneous model needs so many unknown parameters. To compute inversion and to identify the large number of unknowns, high-speed inversion code must be used. For groundwater inverse modeling, the combination of SSVM (Self Scaling Variable Metric method) and adjoint state method, one of the most efficient algorithms for a problem of many unknown parameters, is used. This paper shows memory saving algorithm for this with keeping calculation speed. The memory of developed algorithm is almost proportional to Np, the number of unknowns, while that of usual algorithm is almost proportional to Np2. By the method, a problem of even more than 100, 000 unknown parameters is possible to calculate with usual pc, when the problem is well-posed. Numerical case studies show the code of the algorithm is efficient.
