Brief communication: The effect of resolution uncertainty in road flood-disruption modelling

Abstract. Flood-disruption models are used to support road adaptation planning, yet the influence of flood-map resolution on disruption estimates remains unclear. We show that resolution strongly influences road exposure, which propagates into strong variations within the estimated network disruption metrics. In our case study, apparent road exposure increases when resolution coarsens beyond 5–10 m, indicating that resolutions finer than this range are preferred to limit these effects. At resolutions above 50–70 m, substantially different estimates of connectivity loss and conflicting interpretations of adaptation priorities emerge, highlighting spatial resolution as a key uncertainty in road adaptation assessments.