3d visual of computational mesh mike 213/31/2024 Conversely, when riverine input is greater than 30 m 3 s −1, the dominant hydrodynamic control is fluvial flux, and flushing times during spring tides are longer than at neaps. When total river flow into the estuary is less than 30 m 3 s −1, tidal flux is the dominant hydrodynamic control, which results in high flushing times during neap tides. Flushing times, calculated using a particle tracking method, indicate that the system can take as long as 132 h to flush when river flow is low, or as short as 12 h when riverine input is exceptionally high. Results indicate circulation control changes from tidally to fluvially driven as riverine inputs increase. A depth-averaged hydrodynamic model has been configured of the estuary to investigate the physical processes driving circulation with particular emphasis on understanding the impact of riverine inputs to this system. This paper uses the microtidal Christchurch Harbour estuary in Southern UK as a case study to elucidate the physical controls on eutrophication susceptibility in small shallow basins. Understanding of the hydrodynamics driving circulation and flushing times in small, eutrophic, temperate estuaries is less advanced than larger counterparts due to lack of data and difficulties in accurately modelling small-scale systems. However, more complex methods are required to better understand entire systems. Simple flushing time calculations for estuarine systems can be used as proxies for eutrophication susceptibility.
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