A sensibility analysis of model selection in modeling the reactive transport of cesium in crushed granite

Hwai Ping Cheng, Ming Hsu Li, Samuel Li

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We performed a sensibility analysis of model selection in modeling the reactive transport of cesium in crushed granite through model calibration and validation. Based on some solid phase analysis data and kinetic batch experimental results, we hypothesized three two-site sorption models in the LEHGC reactive transport model to fit the breakthrough curves (BTCs) from the corresponding column experiments. The analysis of breakthrough curves shows that both the empirical two-site kinetic linear sorption model and the semi-mechanistic/semi-empirical two-site kinetic surface complexation model, regardless of their complexity, can match our experimental data fairly well under given test conditions. A numerical experiment to further compare the two models shows that they behave differently when the pore velocity is not of the same order of magnitude as our test velocities. This result indicates that further investigations to help determine a better model are needed. We suggest that a multistage column experiment, which tests over the whole range of practical flow velocities, should be conducted to help alleviate inadequate hypothesized models.

Original languageEnglish
Pages (from-to)371-385
Number of pages15
JournalJournal of Contaminant Hydrology
Volume61
Issue number1-4
DOIs
StatePublished - Mar 2003

Keywords

  • Breakthrough curve
  • Cesium
  • Crushed granite
  • Multistage column experiment
  • Reactive transport

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