Mimicry of a Conceptual Hydrological Model (HBV): What's in a Name?

Koen F. Jansen*, Adriaan J. Teuling, James R. Craig, Marco Dal Molin, Wouter J.M. Knoben, Juraj Parajka, Marc Vis, Lieke A. Melsen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Models that mimic an original model might have a different model structure than the original model, that affects model output. This study assesses model structure differences and their impact on output by comparing 7 model implementations that carry the name HBV. We explain and quantify output differences with individual model structure components at both the numerical (e.g., explicit/implicit scheme) and mathematical level (e.g., lineair/power outflow). It was found that none of the numerical and mathematical formulations of the mimicking models were (originally) the same as the benchmark, HBV-light. This led to small but distinct output differences in simulated streamflow for different numerical implementations (KGE difference up to 0.15), and major output differences due to mathematical differences (KGE median loss of 0.27). These differences decreased after calibrating the individual models to the simulated streamflow of the benchmark model. We argue that the lack of systematic model naming has led to a diverging concept of the HBV-model, diminishing the concept of model mimicry. Development of a systematic model naming framework, open accessible model code and more elaborate model descriptions are suggested to enhance model mimicry and model development.

Original languageEnglish
Article numbere2020WR029143
JournalWater Resources Research
Volume57
Issue number5
Early online date24 Apr 2021
DOIs
Publication statusPublished - 2021

Keywords

  • HBV model
  • model intercomparison
  • model mimicry
  • modular modeling framework

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