This proceedings contains over 180 papers delivered at the 4th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes held on June 21-23, 1999, on Long Island, NY. The conference was designed to promote a broad exchange of state-of-the-art information and views among specialists in the fields of coastal engineering, geology, oceanography, and related disciplines. Focusing on the physical aspects of the sediment processes in coastal and inlet environments, these papers provide a valuable source of information from the latest research to the newest engineering applications. Session topics cover a wide range, including sediment budgets, longshore transport, cross-shore transport, bars, inlet morphology, inlet engineering, spits, beach fill, depth of closure shore protection, navigation channels, dredged material fate, sheet flow, suspended sediments, swash processes, and cliff processes. These and related subjects are examined in peer-reviewed papers describing basic approaches, field data collection, mathematical and physical models, instrumentation, case studies, engineering approaches, and application of general methodologies.