Kuriyama Ozaki

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UNDER CONSTRUCTION

Field Data

Kuriyama and Ozaki (1993) measured the cross-shore distribution of longshore current and wave height at the Hazaki Oceanographical Research Facility (HORF) located on the Japan Pacific coast. Longshore current measurements were made from a 427 m long pier using a float. The wave heights were calculated with ultrasonic wave gauges. The data presented here was taken on March 28, 1989.

Model Setup

A nonuniform Cartesian grid is used with a variable resolution in the cross-shore direction of 3-10 m and a constant resolution of 4 m in the longshore direction. Table 1 shows the offshore wave conditions used in the model simulation. Specific settings for CMS-Flow and CMS-Wave including time steps and steering interval are provided in Tables 2 and 3.

Table 1. Offshore wave conditions

Variable Value
Incident wave angle 27º
Offshore significant wave height 2.14 m
Wave period 8.86 sec

Table 2. CMS-Flow setup

Setting Value
Solver Implicit
Time step 60 sec
Simulation duration 3 hr
Ramp duration 3 hr
Clock time 2.8 min

Table 3. CMS-Wave setup

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

Results

The computed longshore current and significant wave heights are compared to field measurements in Figures 1 and 2. In general, a good comparison is obtained with measurements as illustrated by the goodness of fit statistics shown in Table 4.

Figure 1. Comparison of measured and calculated significant wave heights for the Kuriyama and Ozaki (1993) field experiment. The beach profile is also shown for reference.


Figure 2. Comparison of measured and calculated longshore current for the Kuriyama and Ozaki (1993) field experiment. The beach profile is also shown for reference.


Table 4. Goodness of fit statistics for the Kuriyama abd Ozaki (1993) field case

  No Roller Roller
  Hs, m V, m/s Hs, m V, m/s
RMSE 0.1020 0.2098 0.0976 0.1539
RMAE 0.0457 0.0666 0.0434 0.0142
R2 0.994 0.0015 0.995 0.3236
Bias -0.066 0.0284 -0.062 0.006

References

  • Kuriyama, Y., and Ozaki, Y. (1993). "Longshore current distribution on a bar-trough beach, Field measurements at HORF and numerical model," Report of Port and Harbour Research Institute 32(3), Ministry of Transport, Japan, 3-37.

Test Cases