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Data Assimilation for 2-D Advection-Dispersion Equations

机译:二维对流扩散方程的数据同化

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摘要

Data assimilation based on a variational principle for parameter estimation of 2-D advection-dispersion equations is considered. It is assumed that a priori estimations for the model parameters and the initial condition are available. Improvement of parameters for the radionuclide transport model is reduced to an optimization problem with quadratic cost functional. The cost functional comprises the measurement model and model errors, the initial condition uncertainty and parameter penalties. The existence of a unique solution for the state equations and the adjoint system is proved. Differential properties of the cost functional are investigated and a necessary condition for cost functional minimum is derived. Restrictions on the cost functional weights, which guarantee the existence of a unique stationary point, are derived.
机译:在二维对流扩散方程的参数估计中,考虑了基于变分原理的数据同化。假定模型参数和初始条件的先验估计是可用的。放射性核素传输模型的参数改进被简化为具有二次成本函数的优化问题。成本函数包括测量模型和模型误差,初始条件不确定性和参数惩罚。证明了状态方程和伴随系统的唯一解的存在。研究了成本函数的微分性质,并推导了成本函数最小值的必要条件。得出了对成本函数权重的限制,这些限制保证了唯一的固定点的存在。

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