For future research and applications, the model can be easily coupled to 

 transport models to compute thermal effects, and salinity, sediment, and 

 water-quality constituent transport. 



13. This report also includes a short review of existing, similar 

 simple models of tidal inlet hydrodynamics for comparison of capabilities and 

 for parallel structure for placement of study results in the context of models 

 presently available to the project planner and engineer who may be involved in 

 navigation and beach protection projects. 



14. Application and verification of the model are illustrated with two 

 case studies for which extensive data are available. The first example is 

 Masonboro Inlet, North Carolina, which has a system of interconnected channels 

 but does not have a well-defined bay. Velocity and tidal measurements are 

 available at five locations in the Masonboro Inlet system for 12 September 

 1969. Flow conditions for that date were represented in DYNLETl, and model 

 predictions were compared with field measurements. 



15. The second example is Indian River Inlet, Delaware, an inlet 

 protected by two jetties at its entrance and having two well-defined bays. 



A significant flow-related problem at this inlet is scour occurring at pilings 

 of a major highway bridge crossing its entrance. Velocity measurements at two 

 locations and tidal height measurements at five locations are available for 

 the period of 29 June to 1 July 1989. The results of model calculations are 

 compared with these measurements . 



Organization of This Report 



16. Part I describes the motivation for the study and presents the 

 problem statement and study objective. Parts II and III respectively give the 

 theoretical background and numerical solution scheme defining the model 

 developed in the study, DYNLETl. The main portion of the original numerical 

 modeling work is given in Part III. 



17. Part IV mainly deals with the general procedures for model opera- 

 tion, the user interface, and preparations for running DYNLETl. Parts V and 

 VI give detailed examples of model application and testing for Masonboro 

 Inlet, North Carolina, and Indian River Inlet, Delaware, respectively. 



Part VII contains conclusions and siommarizes results. 



