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Title: Practical Use of Computationally Frugal Model Analysis Methods

Abstract

Abstract Three challenges compromise the utility of mathematical models of groundwater and other environmental systems: (1) a dizzying array of model analysis methods and metrics make it difficult to compare evaluations of model adequacy, sensitivity, and uncertainty; (2) the high computational demands of many popular model analysis methods (requiring 1000's, 10,000 s, or more model runs) make them difficult to apply to complex models; and (3) many models are plagued by unrealistic nonlinearities arising from the numerical model formulation and implementation. This study proposes a strategy to address these challenges through a careful combination of model analysis and implementation methods. In this strategy, computationally frugal model analysis methods (often requiring a few dozen parallelizable model runs) play a major role, and computationally demanding methods are used for problems where (relatively) inexpensive diagnostics suggest the frugal methods are unreliable. We also argue in favor of detecting and, where possible, eliminating unrealistic model nonlinearities—this increases the realism of the model itself and facilitates the application of frugal methods. Literature examples are used to demonstrate the use of frugal methods and associated diagnostics. We suggest that the strategy proposed in this paper would allow the environmental sciences community to achieve greater transparency and falsifiabilitymore » of environmental models, and obtain greater scientific insight from ongoing and future modeling efforts.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8]
  1. U.S. Geological Survey, Boulder, CO (United States); Univ. of Kansas, Lawrence, KS (United States)
  2. Univ. of Adelaide, SA (Australia)
  3. National Center for Atmospheric Research, Boulder, CO (United States)
  4. Florida State Univ., Tallahassee, FL (United States)
  5. Colorado State Univ., Fort Collins, CO (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. Univ. of Darmstadt (Germany)
  8. California State Univ. (CalState), Chico, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1286771
Alternate Identifier(s):
OSTI ID: 1400448
Grant/Contract Number:  
AC05-00OR22725; SC0008272; 0911074; 21-66885
Resource Type:
Accepted Manuscript
Journal Name:
Ground Water
Additional Journal Information:
Journal Volume: 54; Journal Issue: 2; Journal ID: ISSN 0017-467X
Publisher:
Wiley - NGWA
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; 54 ENVIRONMENTAL SCIENCES; Model calibration; Sensitivity analysis; Uncertainty; Bayesian; regression; transparency; falsifiability

Citation Formats

Hill, Mary C., Kavetski, Dmitri, Clark, Martyn, Ye, Ming, Arabi, Mazdak, Lu, Dan, Foglia, Laura, and Mehl, Steffen. Practical Use of Computationally Frugal Model Analysis Methods. United States: N. p., 2015. Web. doi:10.1111/gwat.12330.
Hill, Mary C., Kavetski, Dmitri, Clark, Martyn, Ye, Ming, Arabi, Mazdak, Lu, Dan, Foglia, Laura, & Mehl, Steffen. Practical Use of Computationally Frugal Model Analysis Methods. United States. https://doi.org/10.1111/gwat.12330
Hill, Mary C., Kavetski, Dmitri, Clark, Martyn, Ye, Ming, Arabi, Mazdak, Lu, Dan, Foglia, Laura, and Mehl, Steffen. Sat . "Practical Use of Computationally Frugal Model Analysis Methods". United States. https://doi.org/10.1111/gwat.12330. https://www.osti.gov/servlets/purl/1286771.
@article{osti_1286771,
title = {Practical Use of Computationally Frugal Model Analysis Methods},
author = {Hill, Mary C. and Kavetski, Dmitri and Clark, Martyn and Ye, Ming and Arabi, Mazdak and Lu, Dan and Foglia, Laura and Mehl, Steffen},
abstractNote = {Abstract Three challenges compromise the utility of mathematical models of groundwater and other environmental systems: (1) a dizzying array of model analysis methods and metrics make it difficult to compare evaluations of model adequacy, sensitivity, and uncertainty; (2) the high computational demands of many popular model analysis methods (requiring 1000's, 10,000 s, or more model runs) make them difficult to apply to complex models; and (3) many models are plagued by unrealistic nonlinearities arising from the numerical model formulation and implementation. This study proposes a strategy to address these challenges through a careful combination of model analysis and implementation methods. In this strategy, computationally frugal model analysis methods (often requiring a few dozen parallelizable model runs) play a major role, and computationally demanding methods are used for problems where (relatively) inexpensive diagnostics suggest the frugal methods are unreliable. We also argue in favor of detecting and, where possible, eliminating unrealistic model nonlinearities—this increases the realism of the model itself and facilitates the application of frugal methods. Literature examples are used to demonstrate the use of frugal methods and associated diagnostics. We suggest that the strategy proposed in this paper would allow the environmental sciences community to achieve greater transparency and falsifiability of environmental models, and obtain greater scientific insight from ongoing and future modeling efforts.},
doi = {10.1111/gwat.12330},
journal = {Ground Water},
number = 2,
volume = 54,
place = {United States},
year = {Sat Mar 21 00:00:00 EDT 2015},
month = {Sat Mar 21 00:00:00 EDT 2015}
}

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