Toward more mechanistic representations of biogeochemical processes in river networks: Implementation and demonstration of a multiscale model
Journal Article
·
· Environmental Modelling and Software
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Climate Change Science Institute, Environmental Sciences Division
A recently introduced multiscale model for representing the effects of small-scale hyporheic-zone biogeochemical processes is extended from the reach scale to river network scales. The model uses advection-dispersion-reaction equations for the channel network and one-dimensional advection-reaction subgrid models for the hyporheic zone. We summarize implementation in the integrated surface/subsurface hydrology modeling system Amanzi-ATS. The extension uses topologically defined meshes to represent stream/river networks and associates a hyporheic subgrid model with each channel grid cell. Biogeochemical reaction modeling capability residing in community software is accessed through an application programming interface. The implementation is verified against independent numerical solutions on a single reach. Mesh convergence studies show that commonly used semi-distributed representations can introduce significant spatial discretization error. Denitrification of farm runoff in a subbasin of the Portage River Basin in Ohio, USA is used to demonstrate the general-purpose reactive transport capability.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1819571
- Journal Information:
- Environmental Modelling and Software, Journal Name: Environmental Modelling and Software Journal Issue: xx Vol. 145; ISSN 1364-8152
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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