CHL-L Data

0.12

0.08

0.04

Calc. with c-w interaction

Calc. without c-w interaction

Distance Across Shore, m

Figure 32. Calculated (with and without interaction between current and

waves) and measured wave height for Visser (1982), Case 1

CHL-L Data

Hamilton and Ebersole (2001) investigated methods for establishing a

uniform mean longshore current distribution, as driven by obliquely incident

waves, along the shore in a large laboratory basing recently installed at the

U.S. Army Engineer Research and Development Center (ERDC), Coastal and

Hydraulics Laboratory (CHL), (this data set is referred to as the CHL-L data

here). Two comprehensive test series were conducted on a plane concrete

beach with straight and parallel contours (1:30 slope down to horizontal

bottom) encompassing monochromatic and random waves. Wave height,

mean water level, and longshore current velocity were measured along

several profile transects. For evaluating NMLong-CW, one monochromatic

and one random test were available from the experiments.

Table 5 summarizes the wave conditions for the two tests (Tests 6N and

8E). Hamilton and Ebersole (2001) tabulated the measured data in an

appendix, and the average values over several transects were considered for

model validation in the present study. The water depth in the horizontal

portion of the basin was 0.667 m, and for Test 8E it is the energy-based

significant wave height and peak spectral period that are given in the table.

Table 5

Wave Conditions in the Horizontal Portion of Basin for Two

Tests from Hamilton and Ebersole (2001) Experiments Used in

NMLong-CW Simulations

Test

Wave Height (m)

Wave Period (s)

Wave Angle (deg)

Comment

6N

0.182

2.5

10

Monochromatic

8E

0.225

2.5

10

Random waves

54

Chapter 6 Verification of Longshore Current Model