The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Voyage without constellation: evaluating the performance of three uncalibrated process-oriented models

På svenska

Author

  • Koji Tominaga
  • Julian Aherne
  • Shaun Watmough
  • Mattias Alveteg
  • Jack Cosby
  • Charles Driscoll
  • Maximiliam Posch

Summary, in English

Three process-oriented dynamic acidification models were applied to a long-term monitoring site without calibration to evaluate the influence of model structural differences on simulation. The models were simplified to share as many commonalities as possible so that the main structural differences could be investigated. The models differed in sub-models for cation exchange, organic acids and acid anion speciation. All models were populated with ‘equivalent’ parameters by systematic input mapping. The influence of input variability was addressed through Monte Carlo parameter sampling. The three models behaved exactly the same for tracers (e.g. sulphate and chloride), indicating successful cross-parameterization of the models. Differences in model structure had an impact on some of the simulated chemical parameters. In particular, models using Gapon cation exchange simulated higher base saturation levels in the long run than their Gaines-Thomas counterparts, but simulated lower base cation concentration and acid neutralizing capacity in soil solution when acid deposition levels were high. Multiple-model evaluation frameworks as presented here allow for greater certainty in model predictions; ultimately, this type of framework should be employed when evaluating the impacts of future climate and environmental changes on soil and surface water hydrogeochemistry.

Publishing year

2009

Language

English

Pages

261-272

Publication/Series

Hydrology Research

Volume

40

Issue

2-3

Document type

Journal article

Publisher

IWA Publishing

Topic

  • Chemical Engineering

Keywords

  • acidification
  • hydrogeochemistry
  • input mapping
  • model evaluation
  • Monte Carlo simulation
  • process-oriented models

Status

Published

ISBN/ISSN/Other

  • ISSN: 1998-9563