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ABSTRACT: Sediment resuspension is an important factor in controlling the impact of any\udlocalised point source impacts such as salmon farms; at high-flow (dispersive) sites, resuspension\udcan significantly reduce potential effects. Depositional modelling (DEPOMOD) is widely used to\udpredict localised seabed impacts and includes an optional flow-related resuspension module. This\udstudy examined the observed impacts at 5 farms with contrasting flow regimes to evaluate the role\udof modelled resuspension dynamics in determining impacts. When resuspension was included in\udthe model, net particle export (i.e. no significant net downward flux of organic material) was predicted\udat the most dispersive sites. However, significant seabed effects were observed, suggesting\udthat although the model outputs were theoretically plausible, they were inconsistent with the\udobservational data. When the model was run without resuspension, the results were consistent\udwith the field survey data. This retrospective validation allows a more realistic estimation of the\uddepositional flux required, suggesting that approximately twice the flux was needed to induce an\udeffect level at the dispersive sites equivalent to that at the non-dispersive sites. Moderate enrichment\udwas associated with a flux of ~0.4 and ~1 kg m−2 yr−1, whilst highly enriched conditions\udoccurred in response to 6 and 13 kg m−2 yr−1, for low and dispersive sites, respectively. This study\udshows that the association between current flow, sediment resuspension and ecological impacts is\udmore complex than presently encapsulated within DEPOMOD. Consequently, where depositional\udmodels are employed at dispersive sites, validation data should be obtained to ensure that the\udimpacts are accurately predicted

Predictive depositional modelling (DEPOMOD) of the interactive effect of current flow and resuspension on ecological impacts beneath salmon farms