Tidal Prediction Using the Advanced Circulation Model (ADCIRC) and a Relocatable PC-based System

Blain, Cheryl Ann; Preller, Ruth H.; Rivera, A.

doi:10.5670/oceanog.2002.38

Cited by 28 publications

(11 citation statements)

References 12 publications

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“…Therefore, the relevant comparison is the phase relationship between the Luzon Strait tides and the time the waves arrived at the ASIAEX array lagged back by approximately days. Since no in situ observations were made in the Luzon Strait as part of the ASIAEX program, the tides there were calculated using the global tidal model PCTides [47]. PCTides is an easily relocatable, 2-D (barotropic), depth integrated, constant density, data assimilative model which has been rigorously verified at several sites around the world.…”

Section: A Soliton Generation Vs Luzon Strait Tidesmentioning

confidence: 99%

Internal Solitons in the Northeastern South China Sea Part I: Sources and Deep Water Propagation

Ramp

Tang²,

Duda³

et al. 2004

IEEE J. Oceanic Eng.

344

321

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Abstract-A moored array of current, temperature, conductivity, and pressure sensors was deployed across the Chinese continental shelf and slope in support of the Asian Seas International Acoustics Experiment. The goal of the observations was to quantify the water column variability in order to understand the along-and across-shore low-frequency acoustic propagation in shallow water. The moorings were deployed from April 21-May 19, 2001 and sampled at 1-5 min intervals to capture the full range of temporal variability without aliasing the internal wave field. The dominant oceanographic signal by far was in fact the highly nonlinear internal waves (or solitons) which were generated near the Batan Islands in the Luzon Strait and propagated 485 km across deep water to the observation region. Dubbed trans-basin waves, to distinguish them from other, smaller nonlinear waves generated locally near the shelf break, these waves had amplitudes ranging from 29 to greater than 140 m and were among the largest such waves ever observed in the world's oceans. The waves arrived at the most offshore mooring in two clusters lasting 7-8 days each separated by five days when no waves were observed. Within each cluster, two types of waves arrived which have been named type-a and type-b. The type-a waves had greater amplitude than the type-b waves and arrived with remarkable regularity at the same time each day, 24 h apart. The type-b waves were weaker than the type-a waves, arrived an hour later each day, and generally consisted of a single soliton growing out of the center of the wave packet. Comparison with modeled barotropic tides from the generation region revealed that: 1) The two clusters were generated around the time of the spring tides in the Luzon strait; and 2) The type-a waves were generated on the strong side of the diurnal inequality while the type-b waves were generated on the weaker beat. The position of the Kuroshio intrusion into the Luzon Strait may modulate the strength of the waves being produced. As the waves shoaled, the huge lead solitons first split into two solitons then merged together into a broad region of thermocline depression at depths less than 120 m. Elevation waves sprang up behind them as they continued to propagate onshore. The elevation waves also grew out of regions where the locally-generated internal tide forced the main thermocline down near the bottom. The "critical T. Y. Tang is with the Institute of Oceanography, National Taiwan University, Taipei, ROC.H. point" where the upper and lower layers were equal was a good indicator of when the depression or elevation waves would form, however this was not a static point, but rather varied in both space and time according to the presence or absence of the internal tides and the incoming trans-basin waves themselves.

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Section: A Soliton Generation Vs Luzon Strait Tidesmentioning

confidence: 99%

Internal Solitons in the Northeastern South China Sea Part I: Sources and Deep Water Propagation

Ramp

Tang²,

Duda³

et al. 2004

IEEE J. Oceanic Eng.

344

321

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“…The first is the PCTides 2D tide-and wind-driven sea level prediction model, which can be configured to cover the region of interest and forced with global tide model heights along the boundary and IHO tide station data in the interior (Blain, et al, 2002 (2002)). The OSU model is produced using a barotropic model and assimilating Topex/Poseidon sea surface height observations.…”

Section: General Tide Productsmentioning

confidence: 99%

Validation Test Report for the 1/8 deg Global Navy Coastal Ocean Model Nowcast/Forecast System

Barron¹,

Kara²,

Rhodes³

et al. 2007

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Standard Form 298 (Rev. 8-98)Prescribed by ANSI Std. Z39.18Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Approved for public release; distribution is unlimited. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S ACRONYM(S) 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S REPORT NUMBER(S) Unclassified Unclassified Unclassified UL 149Charlie Barron (228) 688-5423 NCOM MODASThe global Naval Coastal Ocean Model (NCOM) is a 1/8° global application of NCOM developed by the Naval Research Laboratory (NRL) for use at the Naval Oceanographic Office (NAVOCEANO) as a part of an assimilative ocean model nowcast/forecast system. Global NCOM is the first operational global ocean model that has sufficient resolution to be eddy-permitting. Global NCOM supports predictions of ocean currents, temperatures, salinity, sea surface height, and sound speed both directly and by providing initial and boundary conditions for higher-resolution nested ocean models. The forecast system addresses Navy requirements for Numerical Modeling (METOC 9801), High Resolution Surface and Subsurface Currents (METOC 9308), Littoral Salinity Prediction (METOC 9902), and Air-Sea Drift Prediction (METOC 9115). This validation test report describes global NCOM, its use in an assimilative forecast system, and evaluation of assimilative and non-assimilative products using independent climatologies and observations.

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“…As a result, the unstructured grid tidal models can be made representative of tidal measurements even in areas with complex boundary geometries. However, the generation of unstructured grids, especially for time domain models, is a difficult and time-consuming task that requires considerable human intervention and experience (Blain et al 2002). In addition, the unstructured grid models are more prone to contamination of the solution with spurious gravitywave modes, while the finite-difference schemes can be easily made to contain no spurious modes (Walters 2005).…”

mentioning

confidence: 99%

“…As an example, the US Navy tidal prediction system currently consists of a time domain finite-element barotropic tidal model ADCIRC (Luettich et al 1992) and a finite-difference spectral model PCTides (Hubbert et al 2001). The finite-element system is limited to a number of preexisting computational meshes and is not as easily relocatable as the PCTides system, which provides a rapidly relocatable capability and can be quickly exercised in any region of the world (Blain et al 2002).…”

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confidence: 99%

A multigrid methodology for assimilation of measurements into regional tidal models

Logutov

2008

Ocean Dynamics

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This paper presents a rigorous, yet practical, method of multigrid data assimilation into regional structured-grid tidal models. The new inverse tidal nesting scheme, with nesting across multiple grids, is designed to provide a fit of the tidal dynamics to data in areas with highly complex bathymetry and coastline geometry. In these areas, computational constraints make it impractical to fully resolve local topographic and coastal features around all of the observation sites in a stand-alone computation. The proposed strategy consists of increasing the model resolution in multiple limited area domains around the observation locations where a representativeness error is detected in order to improve the representation of the measurements with respect to the dynamics. Multiple high-resolution nested domains are set up and data assimilation is carried out using these embedded nested computations. Every nested domain is coupled to the outer domain through the open boundary conditions (OBCs). Data inversion is carried out in a control space of the outer domain model. A level of generality is retained throughout the presentation with respect to the choice of the control space; however, a specific example of using the outer domain OBCs as the control space is provided, with other sensible choices discussed. In the forward scheme, the computations in the nested domains do not affect the solution in the outer domain.The subsequent inverse computations utilize the observation-minus-model residuals of the forward computations across these multiple nested domains in order to obtain the optimal values of parameters in the control space of the outer domain model. The inversion is carried out by propagating the uncertainty from the control space to model tidal fields at observation locations in the outer and in the nested domains using efficient low-rank error covariance representations. Subsequently, an analysis increment in the control space of the outer domain model is computed and the multigrid system is steered optimally towards observations while preserving a perfect dynamical balance. The method is illustrated using a real-world application in the context of the Philippines Strait Dynamics experiment.

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Tidal Prediction Using the Advanced Circulation Model (ADCIRC) and a Relocatable PC-based System

Cited by 28 publications

References 12 publications

Internal Solitons in the Northeastern South China Sea Part I: Sources and Deep Water Propagation

Internal Solitons in the Northeastern South China Sea Part I: Sources and Deep Water Propagation

Validation Test Report for the 1/8 deg Global Navy Coastal Ocean Model Nowcast/Forecast System

A multigrid methodology for assimilation of measurements into regional tidal models

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