Proceedings of the Ninth International Conference on Estuarine and Coastal Modeling, held in Charleston, South Carolina, October 31-November 2, 2005. This collection contains 48 papers that explore the development, testing, application, calibration, validation, and visualization of predictions from estuarine and coastal models. Topics include: climatology and skill assessment, particle tracking, residence times and spill analysis, biogeomechanical modeling, numerical techniques, structure, and methods, nowcast and forecast systems, sediment resuspension and transport, restoration modeling, combined wave-current modeling, and model visualization and systems integration.