本文推导了二维非稳定流渗流场不同等级网格有限差分理论方法。

This paper gives the deduction of a theoretical method of the finite difference by different grades of grids, which is suitable for the seepage field of two-dimensional unsteady flow.

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以傅里叶定律和能量守恒定律为基础，结合有限差分理论推导出有限差分温度计算模型。

Base on the Fourier law and conservation of energy, and combine the finite difference, this dissertation deduce finite difference temperature model.

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文中涉及粘弹性力学理论、地震波传播理论、有限差分理论、波场正演模拟技术等相关知识。

Many correlative techniques are involved, including seismic viscoelasticity, seismic wave theory, finite-difference and wave field modeling.

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