REPORT DOCUMENTATION PAGE 



Form Approved 

 OMB No. 0704-0188 



Public reporting burden for this collertion of information is estimated to average 1 fiour per response, including the time for reviewing instruaions. searching existing data ! 

 gathering and maintaining the data needed, and completing and reviewing the colleaion of information. Ser>d comments regarding this burden estimate or any other aspea of this 

 colleaion of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Inforfnation Operations and Reports, 1215 Jefferson 

 Davis Highway, Suite 1204, Arlington. VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Pro|ert (0704-0 188), Washington, DC 20503. 



1. AGENCY USE ONLY (Leave blank) 



2. REPORT DATE 



September 1991 



3. REPORT TYPE AND DATES COVERED 



Final report 



4. TITLE AND SUBTITLE 



DYNLETl: Dynamic Implicit Numerical Model of One- 

 Dimensional Tidal Flow Through Inlets 

 6. AUTHOR(S) ^=— _ 



Michael Amein 

 Nicholas C. Kraus 



5. FUNDING NUMBERS 



Work Unit 32526 



7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES} 



See reverse 



8. PERFORMING ORGANIZATION 

 REPORT NUMBER 



Technical Report 

 CERC-91-10 



9. SPONSORING /MONITORING AGENCY NAME(S) AND ADDRESS(ES) 



US Army Corps of Engineers 

 Washington, DC 20314-1000 



10. SPONSORING/MONITORING 

 AGENCY REPORT NUMBER 



11. SUPPLEMENTARY NOTES 



Available from National Technical Information Service, 5285 Port Royal Road, 

 Springfield, VA 22161 



12a. DISTRIBUTION /AVAILABILITY STATEMENT 



Approved for public release; distribution is unlimited 



12b. DISTRIBUTION CODE 



13. ABSTRACT (Maximum 200 words) 



The development and verification of a simple model of inlet hydro- 

 dynamics for use in reconnaissance-level quantitative studies of inlets are 

 presented. The model, named DYNLETl for its one-dimensional modeling of the 

 dynamic (time-dependent) behavior of tidal flow at inlets, is based on the 

 full one-dimensional shallow-water equations employing an implicit finite 

 difference technique. The model is intended for personal computer (PC) users 

 having little or no experience in numerical modeling and facilitates minimal 

 data entry and numerical grid generation. 



DYNLETl can predict flow conditions in channels with varied geometry, 

 and it accepts varying friction factors across an inlet channel, geometric 

 boundary conditions. Values of water surface elevation and average velocity 

 are computed at locations across and along inlet channels and displayed on 

 the PC monitor and written to output files for possible further analysis. 



(Continued) 



14. SUBJECT TERMS 



Indian River Inlet, Delaware 



Inlet 



Masonboro Inlet, North Carolina 



Numerical Model 



Tidal flow 



Tidal inlet hydrodynamics 



15. NUMBER OF PAGES 



130 



16. PRICE CODE 



17. SECURITY CLASSIFICATION 

 OF REPORT 



UNCLASSIFIED 



18. SECURITY CLASSIFICATION 

 OF THIS PAGE 



UNCLASSIFIED 



19. 



SECURITY CLASSIFICATION 

 OF ABSTRACT 



20. LIMITATION OF ABSTRACT 



NSN 7540-01-280-5500 



Standard Form 298 (Rev 2-89) 



Prescribed by anSi Sto 239-18 

 298102 



