Articles | Volume 28, issue 1
https://doi.org/10.5194/hess-28-179-2024
https://doi.org/10.5194/hess-28-179-2024
Review article
 | 
11 Jan 2024
Review article |  | 11 Jan 2024

Adjoint subordination to calculate backward travel time probability of pollutants in water with various velocity resolutions

Yong Zhang, Graham E. Fogg, HongGuang Sun, Donald M. Reeves, Roseanna M. Neupauer, and Wei Wei

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Short summary
Pollutant release history and source identification are helpful for managing water resources, but it remains a challenge to reliably identify such information for real-world, complex transport processes in rivers and aquifers. In this study, we filled this knowledge gap by deriving a general backward governing equation and developing the efficient solver. Field applications showed that this model and solver are applicable for a broad range of flow systems, dimensions, and spatiotemporal scales.