Typhoon-Induced Stage-Frequency Relationships for the Island of Rota, Commonwealth of the Northern Mariana Islands
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICSLAB
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A set of typhoon-induced stage-frequency relationships was developed for inhabited coasts of the island of Rota, Commonwealth of the Northern Mariana Islands. The objective was to assist the Honolulu District in estimating extreme maximum inundation levels and maximum still-water levels with return period of up to 500 years. Calculations of surge, wind and pressure field, and wave characteristics were performed for 28 historical storms and four hypothetical variations of historical storms through application of numerical models. Wave-induced ponding, setup, and runup were calculated at 87 profile locations specified by the Honolulu District. The Empirical Simulation Technique was applied to calculate stage-frequency relationships based on historical storm parameters and calculated response to the storms. These relationships were calculated from the maximum total water levels computed for each storm including storm surge, ponding, and runup and from the maximum still-water levels for each storm including storm surge, ponding, and wave setup. The methodology was calibrated to observations so that stage-frequency values for maximum total water level are expected to represent maximum debris line inundation levels.