Ocean Pointe Coastal Study

Customer
Planning Solutions, Inc.
Start Year
2005
Location
Oahu, HI, United States
Sea Engineering Services
Coastal Engineering
Marine Environmental Studies

SEI developed a state-of-the-art computerized numerical transport model of the discharge plume from a 150 meter wide drainage swale that is proposed along the shoreline immediately east of Oneula Beach Park in Ewa, Oahu. A customized model was used for the 3-dimensional hydrodynamic modeling of the discharge plume transport. The wave model REF/DIF was used to calculate wave direction, breaker heights and wave energy dissipation, which were then input into EFDC. The model incorporated the effects of wind, tide and wave driven currents, and allowed simulation of discharge plume transport under a variety of possible conditions.

The model was used to predict conditions over a range of possible runoff events and ocean conditions. The modeling results show that the site is characterized by good transport and mixing. The modeled conditions were used to investigate potentially harmful effects of sustained, low salinity levels over coral reefs. The results showed that even during calm intervals the periods of exposure were sufficiently low as to not cause harmful effects.

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