DELILAH

UNDER CONSTRUCTION

Field Experiment

Waves and currents were measured at Duck, NC, during October 1-19, 1990 along a cross-shore array of instruments approximately every 3 hr. For additional details on the field experiment the reader is referred to Smith, et al. (1993). The datasets presented here were collected on October 14 for which the beach profile consisted of a pronounced longshore bar .

Model Setup

A nonuniform Cartesian grid is used with a variable resolution in the cross-shore direction between 2-6 m, and a constant resolution in the longshore direction of 6 m. Table 1 shows the offshore wave conditions at an 8-m water depth.

Table 1. Offshore wave conditions

Variable	Value
Incident wave angle	32º
Offshore significant wave height	0.94 m
Wave period	9.7 sec

Table 2. CMS-Flow setup

Setting	Value
Solution scheme	Implicit
Time step	120 sec
Simulation duration	3 hr
Ramp duration	3 hr
Clock time	1.2 min

Table 3. CMS-Wave setup

Setting	Value
Wave breaking	Jansen and Battjes
Spectrum	TMA
Directional spreading distribution	Cosine Power
Directional spreading parameter γ	3.3
Bottom friction	Off
Steering interval	0.25 hr

Results

Figure 1. Comparison of measured and calculated significant wave heights for the DELILAH field experiment.

Figure 2. Comparison of measured and calculated longshore currents for the DELILAH field experiment.

Table 4. Goodness of fit statistics for the DELILAH field experiment

	No Roller		Roller
	Hs, m	V, m/s	Hs, m	V, m/s
RMSE	0.0702	0.2968	0.0808	0.0740
RMAE	0.0311	0.5147	0.0375	0.0010
R2	0.933	0.400	0.9274	0.9150
Bias	0.040	-0.206	0.0486	0.0004

References

• Smith, J. M., Larson, M., and Kraus, N. C. (1993). "Longshore current on a barred beach: Field measurements and calculation," Journal of Geophysical Research, 98(C12), 22,717-22,731.

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