REPORT DOCUMENTATION PAGE - TR-02-22-RPT

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SUBJECT TERMS

TR-02-22-RPT_2
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Form Approved

REPORT DOCUMENTATION PAGE

OMB No. 0704-0188

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2. REPORT TYPE

1. REPORT DATE (DD-MM-YYYY)

3. DATES COVERED (From - To)

Report 2 of a series

September 2002

4. TITLE AND SUBTITLE

5a. CONTRACT NUMBER

NMLONG: Numerical Model for Simulating Longshore Current; Report 2,

5b. GRANT NUMBER

Wave-Current Interaction, Roller Modeling, and Validation of Model

Enhancements

5c. PROGRAM ELEMENT NUMBER

6. AUTHOR(S)

5d. PROJECT NUMBER

Magnus Larson, Nicholas C. Kraus

5e. TASK NUMBER

5f. WORK UNIT NUMBER

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

8. PERFORMING ORGANIZATION REPORT

NUMBER

Department of Water Resources Engineering, Lund University, Box 118, Lund,

Sweden S-22100; U.S. Army Engineer Research and Development Center, Coastal

ERDC/CHL TR-02-22

and Hydraulics Laboratory, 3909 Halls Ferry Road, Vicksburg, MS 39180-6199

10. SPONSOR/MONITOR'S ACRONYM(S)

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

U.S. Army Corps of Engineers

Washington, DC 20314-1000

11. SPONSOR/MONITOR'S REPORT

NUMBER(S)

12. DISTRIBUTION / AVAILABILITY STATEMENT

Approved for public release; distribution is unlimited.

13. SUPPLEMENTARY NOTES

14. ABSTRACT

The Numerical Model of the Longshore current (NMLong) was originally developed under the U.S. Army Corps of Engineers' Dredging

Research Program. It calculates nearshore wave transformation, water level change, and wave-induced longshore current across a single beach profile,

under the assumption of longshore uniformity in both the profile and hydrodynamic processes. In considering the nearshore more generally, and the

waves at an inlet entrance in particular, both tidal and wind-generated currents can be comparable to or exceed the strength of the wave-generated

longshore current. Also, currents produced independently by waves and by wind and tide may be in opposite directions, producing complex

distributions of the current across the shore. The capability of representing the action of currents in NMLong and the interaction between the current

and waves resulted in a new model with the modified name NMLong-CW, where CW stands for the interaction between currents and waves. The new

model includes an algorithm to simulate the contribution of wave rollers generated by breaking waves, improving agreement of calculations to

measurements of the longshore current on a beach profile with a longshore bar.

This report documents the theoretical developments associated with the enhancement of NMLong that have extended it to NMLong-CW. The

new model is validated by sensitivity tests and through comparison of calculations to both field and laboratory measurements of waves and currents.

Wave transformation at a long, narrow inlet, resulting in changes in wave steepness as well as wave blocking, is described.

15. SUBJECT TERMS

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PERSON

OF ABSTRACT

OF PAGES

a. REPORT

b. ABSTRACT

c. THIS PAGE

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area code)

UNCLASSIFIED

Standard Form 298 (Rev. 8-98)

Prescribed by ANSI Std. 239.18

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