Characterizing the effluence near Waikiki, Hawaii with a coupled biophysical model

Johnson, Abby E.; Powell, Brian; Steward, Grieg F.

doi:10.1016/j.csr.2012.12.007

Cited by 9 publications

(14 citation statements)

References 28 publications

(29 reference statements)

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“…A relatively large rain event occurred in the evening of the second day of simulation; however, the river fluxes are over 30 times smaller than previously observed extreme events, such as in the case study presented by Johnson et al (2013). This means the influence of the river discharge on the water column stratification is restricted to the Ala Wai mouth.…”

Section: Model Experimentsmentioning

confidence: 60%

“…A description and evaluation of the assimilation system is provided by Souza et al (2015). The present simulations were nested inside the ≈ 250 m horizontal resolution grid comprehending the south shore of O'ahu, the same models used by Johnson et al (2013), with boundary conditions provided every 3 h. A buffer zone gradually merges the two grids in terms of resolution and bathymetry. In the PacIOOS project all simulations are nested offline due to operational reasons, such that the small-scale processes in the inner grids have no impact on the outer grids.…”

Section: The Roms Modelmentioning

confidence: 99%

“…Input fluxes from the Kalihi and Palolo-Mānoa channels were obtained from the USGS (http: //waterdata.usgs.gov). Similar to Johnson et al (2013), the Palolo-Mānoa channel flux was multiplied by 1.3 to account for the contributions from runoff waters and smaller drainage sources into the Ala-Wai Canal.…”

Section: The Roms Modelmentioning

confidence: 99%

“…While focusing on the fate of harmful bacteria from the Ala Wai plume, Johnson et al (2013) developed a Regional Ocean Modeling System (ROMS) simulation for a similar region as this study. They examined sporadic events of large flux from the Ala Wai Canal using a relatively coarse horizontal resolution (250 m) model incapable of resolving the several channels in the reef banks.…”

Section: Introductionmentioning

confidence: 99%

“…Comparing model results to observations, these authors demonstrate how the errors in the modeled currents increase if one uses smoothing scales larger than 100 m for the bathymetry. To examine the influence of waves, Johnson et al (2013) used a prescribed wave field as additional forcing to the ROMS model that did not consider the influence of the currents on the waves. Moreover, the authors used a parameterization based on the Mellor (2003Mellor ( , 2005 approach to estimate the modification of the currents by the wave field.…”

Section: Introductionmentioning

confidence: 99%

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Different approaches to model the nearshore circulation in the south shore of O'ahu, Hawaii

Souza

Powell

2017

Ocean Sci.

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Abstract. The dynamical interaction between currents, bathymetry, waves, and estuarine outflow has significant impacts on the surf zone. We investigate the impacts of two strategies to include the effect of surface gravity waves on an ocean circulation model of the south shore of O'ahu, Hawaii. This area provides an ideal laboratory for the development of nearshore circulation modeling systems for reef-protected coastlines. We use two numerical models for circulation and waves: Regional Ocean Modeling System (ROMS) and Simulating Waves Nearshore (SWAN) model, respectively. The circulation model is nested within larger-scale models that capture the tidal, regional, and wind-forced circulation of the Hawaiian archipelago. Two strategies are explored for circulation modeling: forcing by the output of the wave model and online, two-way coupling of the circulation and wave models. In addition, the circulation model alone provides the reference for the circulation without the effect of the waves. These strategies are applied to two experiments: (1) typical trade-wind conditions that are frequent during summer months, and (2) the arrival of a large winter swell that wraps around the island. The results show the importance of considering the effect of the waves on the circulation and, particularly, the circulation-wave coupled processes. Both approaches show a similar nearshore circulation pattern, with the presence of an offshore current in the middle beaches of Waikiki. Although the pattern of the offshore circulation remains the same, the coupled waves and circulation produce larger significant wave heights ( ≈ 10 %) and the formation of strong alongshore and cross-shore currents (≈ 1 m s −1 ).

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Section: Model Experimentsmentioning

confidence: 60%

Section: The Roms Modelmentioning

confidence: 99%

Section: The Roms Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Different approaches to model the nearshore circulation in the south shore of O'ahu, Hawaii

Souza

Powell

2017

Ocean Sci.

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Surges around the Hawaiian Islands from the 2011 Tohoku Tsunami

Cheung

Bai

Yamazaki

2013

J. Geophys. Res. Oceans

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[1] The 2011 Tohoku tsunami devastated the northeastern Japan coasts and caused localized damage to coastal infrastructure across the Pacific. The tsunami resulted in strong currents around the Hawaiian Islands that led to closure of harbors and marinas for up to 38 h after its arrival. We utilize a nonhydrostatic model to reconstruct the tsunami event from the seismic source for elucidation of the physical processes and inference of the coastal hazards. A number of tide gauges, bottom pressure sensors, and ADCPs provided point measurements for validation and assessment of the model results in Hawaii. Spectral analysis of the computed surface elevation and current reveals complex flow patterns due to multiscale resonance. Standing waves with 33-75 min period develop along the island chains, while oscillations of 27 min or shorter are primarily confined to an island or an island group with interconnected shelves. Standing edge waves with periods 16 min or shorter, which are able to form nodes on the reefs and inside harbors, are the main driving force of the observed coastal currents. Resonance and constructive interference of the oscillation modes provide an explanation of the impacts observed in Hawaii with implications for emergency management in Pacific island communities.

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Effect of species, provenance, and coral physiology on the composition of Hawaiian coral-associated microbial communities

et al. 2021

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Characterizing the effluence near Waikiki, Hawaii with a coupled biophysical model

Cited by 9 publications

References 28 publications

Different approaches to model the nearshore circulation in the south shore of O'ahu, Hawaii

Different approaches to model the nearshore circulation in the south shore of O'ahu, Hawaii

Surges around the Hawaiian Islands from the 2011 Tohoku Tsunami

Effect of species, provenance, and coral physiology on the composition of Hawaiian coral-associated microbial communities

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