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\begin{document}

\title{A multi-chemistry modelling framework to enable flexible and
reproducible water quality simulations in existing hydro-models: 2. The
OpenWQ-SUMMA and OpenWQ-CRHM model implementations and testing.}



\author[1]{Diogo Costa}%
\author[2]{Kyle Klenk}%
\author[2]{Wouter Johannes Maria Knoben}%
\author[2]{Andrew Ireson}%
\author[2]{Raymond J Spiteri}%
\author[3]{Martyn P. Clark}%
\affil[1]{University of Évora}%
\affil[2]{University of Saskatchewan}%
\affil[3]{Centre for Hydrology, University of Saskacthewan Coldwater Laboratory}%


\vspace{-1em}



  
  \date{May 20, 2024}


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\begin{abstract}
This work advances the cross-model deployment of ecological and
biogeochemical simulation capabilities in existing process-based
hydro-modeling tools, which we term ``Open Water Quality'' (OpenWQ). The
companion paper details aspects of the OpenWQ architecture that enables
its plug-in type incorporation into existing models, along with its
innovative aspects that enable biogeochemistry lab-like capabilities.
OpenWQ's innovative aspects allow modelers to define the pollution
problem(s) of interest, the appropriate complexity of the
biogeochemistry routines, test different modeling hypotheses, and deploy
them across different hydro-models. In this second paper, we implemented
the coupling recipe described in the first paper to integrate OpenWQ
into two hydro-models, SUMMA and CRHM. Here we explain how the
implemented coupling interface between the two models provides water
quality simulation capacities in the host hydro-models but, more
importantly, establishes a direct and permanent link for the transfer of
innovation between the modeling communities. Example applications of
different pollution studies enabled by our coupling recipe are also
provided to address some of these fundamental water quality modeling
challenges.%
\end{abstract}%



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