This volume contains the proceedings of the 3rd International Conference on Estuarine and Coastal Modeling held in Oak Brook, Illinois, September 8-10, 1993. The conference included sessions describing recent developments and application of estuarine and coastal models. The papers cover the entire spectrum of interest in the field from model development through problems of model application and interpretation. Special sessions were held on nowcasting/forecasting, contaminated sediment dynamics, and model formulations and coordinate transformations. Each paper in the publication was subject to independent peer review prior to acceptance. The authors represent a well balanced mix of professionals from government, private industry and academic institutions.