An Examination of Breakwater Performance at Burns Harbor, Indiana
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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This discussion compares incident and transferred spectral results for gages located at Burns Harbor, Indiana. Comparisons are made by examining the differences in the incident and transferred harbor energy spectrums. Spectral analysis allows the energy of the total wave record to be broken down into discrete frequency bands. Energy inside and outside the harbors may then be compared and a transfer factor for each discrete frequency can be determined. Incident and harbor wave data were collected within and offshore of the breakwater at Burns Harbor, Indiana. The purpose of this data collection effort was to determine characteristics of the rubble mound breakwater located there. Wave records were collected hourly using subsurface pressure sensors. The sample rate for these sensors was 1 Hz and the burst length was 2048 seconds. The analysis utilized the Welch, 1, spectral analysis method with 50 overlapping segments. Since the raw time series were obtained using sub-surface systems, a depth determined high frequency cutoff was applied. The averaged co-and quad-spectra from each analyzed record were used to calculate significant wave height Hm0, peak period Tp, and mean wave direction at Tp Dp and energy spectrums.
- Hydrology, Limnology and Potamology
- Civil Engineering