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Estuaries exist along the edge of the oceans and seas, and are char acterized by the dilution of sea water by inflowing fresher waters. The motion and interaction of these two types of water (fresh and salt water) determine the salinity distribution within the estuary and that, in turn, affects the organisms residing there. The purpose of this vol ume is to review the status of our understanding of estuarine circu lation and how the circulation patterns affect living and nonliving resources in estuaries. For many years, the primary paradigm for estuarine circulation was the two-layered net or nontidal gravitational circulation pattern first proposed by Dr. Donald Pritchard in his studies of the James River estuary. During the last decade or so, research has focused on the many variations about this theme and the factors that control the transport processes. Many of these aspects are covered in the initial papers in this volume. Water movement, of course, is of interest be cause it transports marine organisms, sediments, and pollutants. Es tuarine circulation has a significant effect on estuarine food chains, and on the distribution and abundance of organisms, such as the American oyster, that are freely transported by the currents during larval stages. The intent is to bring together many of these topics in a single volume. This volume is dedicated to Dr. Donald W.

Estuarine Circulation

Estuarine Classification-A Help or a Hindrance.- Estuarine Flow Interaction with Topography; Lateral and Longitudinal Effects.- Headland Eddies in a Tidal Estuary.- Residual Currents in the Peconic Bays Estuary.- The Response of Estuarine Circulation to Local Wind Events.- Computer Simulation of Wind-Driven Circulation in a Coastal Lagoon.- On Inter-Tidal Transport Equation.- Excitation-Response Analysis of Estuarine Circulation.- A Tale of Two Estuaries: Columbia Bay, Alaska, and San Francisco Bay, California.- Time Scale Variations of Estuarine Stratification Parameters and Impact on the Food Chains of the Chesapeake Bay.- The Influence of Physical Factors in Governing Temporal and Spatial Variations of Seston.- Interaction Between Circulation of the Estuary of the James River and Transport of Oyster Larvae.- The Role of Bottom Current and Estuarine Geomorphology on the Sedimentation Processes and Productivity of Wreck Shoal, an Oyster Reef of the James River, Virginia.- Considerations on Soft Mud Response under Waves.- River Discharge and Sediment Deposition in the Upper Pamlico Estuary.- Role of Models in Estuarine Flow and Water Quality Analysis.