Spectral Characteristics of 100-Year Storm Waves in the Gulf of Mexico and their Implications for FPSO Design

Abstract

The Gulf of Mexico is a critical region for offshore oil and gas exploration, yet it is subject to extreme environmental conditions including hurricanes and long-period storm seas. This paper examines the spectral characteristics of 100-year return period storm waves in the Gulf of Mexico and assesses their implications for the design and operation of Floating Production, Storage, and Offloading (FPSO) units. Using parametric wave spectra with significant wave height (Hs = 12.2 m) and zero up-crossing period (Tz = 14s), spectral moments and bandwidths were derived to evaluate energy distributions. Results reveal that Gulf of Mexico spectra exhibit intermediate bandwidth values (0.7369–0.8165), reflecting both storm and swell contributions. FPSO response simulations indicate heightened heave motions at resonance and amplified pitch/roll motions under broad-banded spectra. The findings emphasize the necessity of accurate spectral modeling for structural design, riser fatigue analysis, and mooring configuration in hurricane-prone regions.

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