| Summary: | 碩士 === 淡江大學 === 水資源及環境工程學系 === 90 === This paper discussed the problem of pump groundwater from a water-bearing stratum confined by two impervious horizontal planes in theoretically and numerically. This study is based upon the nonlinear partial difference equation representing the land subsidence coupled with a “source” to denote the pumping discharge, i.e. the governing equation. The Laplace transformation finite difference method is adopted for numerical calculations. Distinguish to inside and outside areas by dividing point. Taking inside grid 0.415 meters, outside grid parabola mode increase progressively, and set 10 meter as a dividing point. The outcome of mentioned above close to the analysis solution of governing equation the most. Finally, the influences on land subsidence due to those relative coefficients (diffusion coefficient, D0、permeability, K、Compression index, Cc、pumping coefficient, N0) would be studied.
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