A Bay/Estuary Model to Simulate Hydrodynamics and ...

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XVI International Conference on Computational Methods in Water Resources (CMWR-XVI) Ingeniørhuset

A Bay/Estuary Model to Simulate Hydrodynamics and Water Quality Transport: Part 2 - Water Quality
Author:Tien-Shuenn Wu <tien-shuenn.wu@dep.state.fl.us> (Florida Department of Environmental Protection)
Gordon Hu <ghu@sfwmd.gov> (South Florida Water Management District)
Jing Yu <ji324333@pegasus.cc.ucf.edu> (University of Central Florida)
Gour-Tsyh (George) Yeh <gyeh@mail.ucf.edu> (University of Central Florida)
Presenter:Jing Yu <ji324333@pegasus.cc.ucf.edu> (University of Central Florida)
Date: 2006-06-18     Track: General Sessions     Session: General

This paper presents the development of a numerical water quality model using a general paradigm of reaction-based approaches. In a reaction-based approach, all conceptualized biogoechemical processes are transformed into a reaction network. Through the decomposition of species governing equations via Gauss-Jordan column reduction of the reaction network, (1) redundant fast reactions and irrelevant kinetic reactions are removed from the system, which alleviates the problem of unnecessary and erroneous formulation and parameterization of these reactions, and (2) fast reactions and slow reactions are decoupled, which enables robust numerical integrations. The system of M species transport equations is transformed to M reaction-extent transport equations, which is then approximated with three subsets: NE algebraic equations, NKI kinetic-variables transport equations, and NC component transport equations. As a result, the model alleviates the needs of using simple partitions for fast reactions. With the diagonalization strategy, it makes the inclusion of arbitrary number of fast and kinetic reactions relatively easy, and, more importantly, it enables the formulation and parameterization of kinetic reactions one by one. To demonstrate the flexibility and generality, the eutrophication model in WASP5, QUAL2E, and CE-QUAL-ICM are recast in the mode of reaction networks. This illustrates that the model embeds the most widely used water quality models as specific examples. Based on these three examples, the deficiencies of current practices in water quality modeling are discussed and the actions that must be taken to improve these practices are addressed.