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The solution to large-scale inverse problems critically depends on methods to reduce computational cost. Recent research approaches tackle this challenge in a variety of different ways. Many of the computational frameworks highlighted in this book build upon state-of-the-art methods for simulation of the forward problem, such as, fast Partial Differential Equation (PDE) solvers, reduced-order models and emulators of the forward problem, stochastic spectral approximations, and ensemble-based approximations, as well as exploiting the machinery for large-scale deterministic optimization through adjoint and other sensitivity analysis methods.
• Brings together the perspectives of researchers in areas of inverse problems and data assimilation.
• Assesses the current state-of-the-art and identify needs and opportunities for future research.
• Focuses on the computational methods used to analyze and simulate inverse problems.
• Written by leading experts of inverse problems and uncertainty quantification.
Graduate students and researchers working in statistics, mathematics and engineering will benefit from this book.
2 A Primer of Frequentist and Bayesian Inference in Inverse Problems
2.2 Prior Information and Parameters: What do you know, and what do you want to know?
2.3 Estimators: What can you do with what you measure?
2.4 Performance of estimators: How well can you do?
2.5 Frequentist performance of Bayes estimators for a BNM
3 Subjective Knowledge or Objective Belief? An Oblique Look to Bayesian Methods
3.2 Belief, information and probability
3.3 Bayes' formula and updating probabilities
3.4 Computed examples involving hypermodels
3.5 Dynamic updating of beliefs
4 Bayesian and Geostatistical Approaches to Inverse Problems
4.2 The Bayesian and Frequentist Approaches
4.3 Prior Distribution
4.4 A Geostatistical Approach
5 Using the Bayesian Framework to Combine Simulations and Physical Observations
for Statistical Inference
5.2 Bayesian Model Formulation
5.3 Application: Cosmic Microwave Background
6 Bayesian Partition Models for Subsurface Characterization
6.2 Model equations and problem setting
6.3 Approximation of the response surface using the Bayesian Partition Model and two-stage
6.4 Numerical results
7 Surrogate and reduced-order modeling: a comparison of approaches for large-scale
statistical inverse problems
7.2 Reducing the computational cost of solving statistical inverse problems
7.3 General formulation
7.4 Model reduction
7.5 Stochastic spectral methods
7.6 Illustrative example
8 Reduced basis approximation and a posteriori error estimation for parametrized
parabolic PDEs; Application to real-time Bayesian parameter estimation
8.2 Linear Parabolic Equations
8.3 Bayesian Parameter Estimation
8.4 Concluding Remarks
9 Calibration and Uncertainty Analysis for Computer Simulations with Multivariate
9.2 Gaussian Process Models
9.3 Bayesian Model Calibration
9.4 Case Study: Thermal Simulation of Decomposing Foam
10 Bayesian Calibration of Expensive Multivariate Computer Experiments
10.1 Calibration of computer experiments
10.2 Principal component emulation
10.3 Multivariate calibration
11 The Ensemble Kalman Filter and Related Filters
11.2 Model Assumptions
11.3 The Traditional Kalman Filter (KF)
11.4 The Ensemble Kalman Filter (EnKF)
11.5 The Randomized Maximum Likelihood Filter (RMLF)
11.6 The Particle Filter (PF)
11.7 Closing Remarks
11.8 Appendix A: Properties of the EnKF Algorithm
11.9 Appendix B: Properties of the RMLF Algorithm
12 Using the ensemble Kalman Filter for history matching and uncertainty quantification
of complex reservoir models
12.2 Formulation and solution of the inverse problem
12.3 EnKF history matching workflow
12.4 Field Case
13 Optimal Experimental Design for the Large-Scale Nonlinear Ill-posed Problem of
13.2 Impedance Tomography
13.3 Optimal Experimental Design - Background
13.4 Optimal Experimental Design for Nonlinear Ill-Posed Problems
13.5 Optimization Framework
13.6 Numerical Results
13.7 Discussion and Conclusions
14 Solving Stochastic Inverse Problems: A Sparse Grid Collocation Approach
14.2 Mathematical developments
14.3 Numerical Examples
15 Uncertainty analysis for seismic inverse problems: two practical examples
15.2 Traveltime inversion for velocity determination.
15.3 Prestack stratigraphic inversion
16 Solution of inverse problems using discrete ODE adjoints
16.2 Runge-Kutta Methods
16.3 Adaptive Steps
16.4 Linear Multistep Methods
16.5 Numerical Results
16.6 Application to Data Assimilation