Citations with the tag: TIDAL currents
Results 1 - 50
- Modeling Tidal Current Profiles and Vertical Mixing beneath Filchner�Ronne Ice Shelf, Antarctica.
Makinson, Keith // Journal of Physical Oceanography; Jan2002, Vol. 32 Issue 1, p202
One of the warmest water masses beneath Filchner�Ronne Ice Shelf (FRIS) is dense, high salinity shelf water (HSSW) that flows into the sub-ice-shelf cavity from the ice front and occupies the lower portion of the water column. A one-dimensional turbulence closure ocean model has been applied...
- Monkeyshines on Tides.
Makinson, Keith // Monkeyshines on America; Mar99 Oceans & Oceanography Issue, p9
Presents information on tides. Description of tides; Formation of high tides and low tides; Stand of the tide; Cause of the rise and fall of the tides; Ebb of the tide; Effects of tidal currents.
- Tidal currents and mixing in the Gulf of St. Lawrence: an application of the incremental approach to data assimilation.
Lu, Youyu; Thompson, Keith R.; Wright, Daniel G. // Canadian Journal of Fisheries & Aquatic Sciences; Apr2001, Vol. 58 Issue 4, p723
Discusses the use of the incremental approach to data assimilation to assimilate tidal heights from 19 tide gauges around the Gulf of Saint Lawrence into a fully nonlinear, three-dimensional model. Predicted sea level fields; Prediction of tidal currents; Identification of regions of mixed and...
- High hopes for low-flying kite.
Zolfagharifard, Ellie // Engineer (00137758); 5/24/2010, Vol. 295 Issue 7795, p7
The article reports on the 1.7 million pounds private funding to develop an underwater kite, known as Deep Green, which aims to generate electricity from tidal currents by up to 80% in Great Britain.
- Wave-powered generator set for three-month trials.
Zolfagharifard, Ellie // Environmental Engineering; Jun2010, Vol. 23 Issue 2, p3
The article reports on the three-month trial of the Neptune Proteus tidal-stream generator in Sunderland, England.
- The influence of Gulf of Mexico Loop Current intrusion on the transport of the Florida Current.
Yuehua Lin; Greatbatch, Richard J.; Jinyu Sheng // Ocean Dynamics; Oct2010, Vol. 60 Issue 5, p1075
Based on an empirical orthogonal function analysis of satellite altimeter data, guidance from numerical model results, and CANEK transport estimates, we propose an index, based on differences in satellite-measured sea surface height anomalies, for measuring the influence of Gulf of Mexico Loop...
- Norway nabs tidal-power crown.
Yuehua Lin; Greatbatch, Richard J.; Jinyu Sheng // Power; Mar2003, Vol. 147 Issue 2, p5
Reports on the use of tidal currents to generate electricity in Norway, as of March 2003. Description of the proprietary water wind mill technology from Hammerfest Stroam; Cost of the project; Views on the potential of tidal powerplants.
- Comparison of Observed (HF Radar and ADCP Measurements) and Computed Tides in the North Channel of the Irish Sea.
Davies, Alan M.; Hall, Philip; Howarth, M. John; Knight, Philip J.; Player, Rose J. // Journal of Physical Oceanography; Jul2001, Vol. 31 Issue 7, p1764
A three-dimensional high-resolution (grid of order 1 km) model of the North Channel of the Irish Sea, incorporating a one equation turbulence energy submodel to parameterize vertical mixing, is used to compute the M[sub 2] , S[sub 2] , N[sub 2] , K[sub 1] , and O[sub 1] tides. Elevations and...
- Influence of the Transport on the Instability of a Boundary Current.
Capet, Xavier J.; Cherubin, Laurent; Morel, Yves // Journal of Physical Oceanography; Oct2002, Vol. 32 Issue 10, p2806
This paper examines the stability properties of coastal currents having the same potential vorticity (PV) structure but different transports and widths. The PV structure is chosen so as to verify the Charney-Stern necessary condition for instability: two PV fronts associated with opposite sign...
- The M[sub 2] Internal Tide off Oregon: Inferences from Data Assimilation.
Kurapov, Alexander L.; Egbert, Gary D.; Allen, J. S.; Miller, Robert N.; Erofeeva, Svetlana Y.; Kosro, P. M. // Journal of Physical Oceanography; Aug2003, Vol. 33 Issue 8, p1733
A linearized baroclinic, spectral-in-time tidal inverse model has been developed for assimilation of surface currents from coast-based high-frequency (HF) radars. Representer functions obtained as a part of the generalized inverse solution show that for superinertial flows information from the...
- Medic Nearly Falls Victim to Rip Tide.
Kurapov, Alexander L.; Egbert, Gary D.; Allen, J. S.; Miller, Robert N.; Erofeeva, Svetlana Y.; Kosro, P. M. // Citizen Airman: The Official Magazine of the Air National Guard ; Aug2000, Vol. 52 Issue 4, p28
Relates the attempt of Second Lieutenant George M. Hilyard to rescue people caught in a rip tide in Florida. Information on the surf and currents; Account of a woman rescuer being pulled by the current; Failure of Hilyard to get out of the rip tide; Efforts of the lifeguard to rescue Hilyard.
- Comments on 'Reflections over Neap to Spring Tide Ratios and Spring Tide Retardment in....
Guohong Fang // Journal of Physical Oceanography; Jan2001, Vol. 31 Issue 1, p297
Comments on the reflections over neap to spring tide ratios and spring tide retardment in co-oscillating basins with reference to observations from the North Sea. Difference in energy equation between tidal dynamics and Gade theory; factors causing changes in the neap to the spring ratio and...
- Internal Tide Observations from the Australian North West Shelf in Summer 1995.
Holloway, Peter E.; Chatwin, Paul G. // Journal of Physical Oceanography; May2001, Vol. 31 Issue 5, p1182
Observations are presented of the internal tide over the continental shelf and slope from a cross section on the Australian North West Shelf. Data collected from moored instruments and repeated profile measurements during the summer months of 1995 show an energetic, large amplitude, shoreward...
- Volume Transport Through Tidal Channels in the Middle Florida Keys.
Smith, Ned P.; Lee, Thomas N. // Journal of Coastal Research; Spring2003, Vol. 19 Issue 2, p254
Shipboard acoustic Doppler current profiler (ADCP) data from six synoptic surveys are combined with current meter, bottom pressure and wind data to describe tidal and low-frequency exchanges through four tidal channels in the Middle Florida Keys. ADCP crossings provide transport rates for...
- NARUTO: PAST AND PRESENT*.
Zabusky, Norman J.; Townsend, Wesley // Physics of Fluids; Sep97, Vol. 9 Issue 9, pS8
Summarizes the Naruto images collected by the author during his visit to Japan in 1996. Tidal current contained in the Naruto strait; Near-vertical aerial view of a sight-seeing boat close to the southwestern edge of the cascade.
- Rotary Velocity Spectra from Short Drifter Tracks.
Crawford, W.R.; Cherniawsky, J.Y.; Foreman, M.G.G. // Journal of Atmospheric & Oceanic Technology; Jun98, Vol. 15 Issue 3, p731
The authors describe a method utilizing short-duration drifter tracks to compute rotary velocity amplitudes and phases for tidal frequency bands. These are compared to amplitudes and phases from a tidal model, revealing the regions where strong internal tides dominate the observed record or the...
- Seasonal variability of phytoplankton fluorescence in relation to the Straits of Messina (Sicily) tidal upwelling.
Azzaro, F.; Decembrini, F.; Raffa, F.; Crisafi, E. // Ocean Science Discussions; 2007, Vol. 4 Issue 3, p415
In the Straits of Messina the large gradients of tidal displacements as well as the topographic constrictions determine the upwelling of deeper waters in the surface layer. This work describes the seasonal variability of surface distribution of phytoplankton biomass depending on upwelling...
- Mull of Kintyre set to host CoRMaT tidal current turbine.
Azzaro, F.; Decembrini, F.; Raffa, F.; Crisafi, E. // Engineer (Online Edition); 8/31/2012, p4
The article reports that Glasgow, Scotland-based Nautricity will test a new tidal energy technology in the Mull of Kintyre. Nautricity's CoRMaT tidal current turbine (TCT) will be deployed in the sea, south of Machrihanish. The TCT will generate electricity which will be fed into the electrical...
- 1986: Concrete barriers repel North Sea storms from Holland.
Azzaro, F.; Decembrini, F.; Raffa, F.; Crisafi, E. // ENR: Engineering News-Record; 10/04/99, Vol. 243 Issue 14, p55
Provides information on the storm barrier built in 1986 to protect Holland from the tidal flow coming from the North Sea. Description of the storm barrier; How it was built; Cost.
- Your questions answered: building a Severn barrage.
Harris, Stephen // Engineer (Online Edition); 2/11/2013, p11
The article presents questions and answers related to the proposals to build a tidal barrage across the Severn estuary, including the relevance of the tidal barrage, and the alternative technologies for a barrage.
- Current Patterns in the Inner Sound (Pentland Firth) from Underway ADCP Data*.
Goddijn-Murphy, Lonneke; Woolf, David K.; Easton, Matthew C. // Journal of Atmospheric & Oceanic Technology; Jan2013, Vol. 30 Issue 1, p96
Numerous acoustic Doppler current profiler (ADCP) surveys were performed in the Inner Sound of the Pentland Firth, a channel between the Orkney Islands and the northern coast of Scotland connecting the Atlantic Ocean to the west and the North Sea to the east. The Pentland Firth has the highest...
- Tidal Tempest.
Koppel, Tom // Canadian Geographic; Aug/Sep91, Vol. 111 Issue 4, p48
Focuses on the tidal rapids in Canada. Fastest tidal currents at the Skookumchuck Rapids; Generation of currents up to 15 knots; Tidal rapids as an attraction to sport fishermen; Upwellings created by tidal rapids; Special conditions created by tidal rapids for wildlife; Fluctuation of the...
- The Squeezing of Eddies through Gaps.
Simmons, Harper Lightfoot; Nof, Doron // Journal of Physical Oceanography; Jan2002, Vol. 32 Issue 1, p314
The islands of the Lesser Antilles present a porous meridional barrier to North Brazil Current (NBC) rings. To better understand if, when, and how a NBC ring could be squeezed into the Caribbean Sea through such a gappy barrier, the encounter of a westward drifting eddy with a porous meridional...
- Reynolds Stress and Turbulent Energy Production in a Tidal Channel.
Rippeth, Tom P.; Williams, Eirwen; Simpson, John H. // Journal of Physical Oceanography; Apr2002, Vol. 32 Issue 4, p1242
A high-frequency (1.2 MHz) acoustic Doppler current profiler (ADCP) moored on the seabed has been used to observe the mean and turbulent flow components in a narrow tidally energetic channel over six tidal cycles at neap and spring tides. The Reynolds stress has been estimated from the...
- Prototype tidal powerplant installed off Britain's coast.
Rippeth, Tom P.; Williams, Eirwen; Simpson, John H. // Power; Nov/Dec2002, Vol. 146 Issue 8, p16
Presents information on a tidal stream power plant project off the coast of Great Britain. Materials used in the construction of the power plant; Background on the plant's electricity production process; Plans for controlling the functions of the plant.
- Development of a Data Sampling Strategy for Semienclosed Seas Using a Shallow-Water Model.
Rippeth, Tom P.; Williams, Eirwen; Simpson, John H. // Journal of Atmospheric & Oceanic Technology; Oct97, Vol. 14 Issue 5, p1157
The interdependence of numerical coastal ocean models and field observations forms a basis for development of a data sampling strategy. The sampling strategy is centered on the identification of regions for field measurement that have the greatest impact on model-simulated dynamics....
- Improved Advection Schemes for Ocean Models.
Rippeth, Tom P.; Williams, Eirwen; Simpson, John H. // Journal of Atmospheric & Oceanic Technology; Oct98, Vol. 15 Issue 5, p1171
Leonard's widely used QUICK advection scheme is, like the Bryan-Cox-Semtner ocean model, based on a control volume form of the advection equation. Unfortunately, in its normal form it cannot be used with the leapfrog-Euler forward time-stepping schemes used by the ocean model. Farrow and...
- Using a Broadband ADCP in a Tidal Channel. Part I: Mean Flow and Shear.
Lu, Youyu; Lueck, Rolf G. // Journal of Atmospheric & Oceanic Technology; Nov99, Vol. 16 Issue 11, p1
This paper discusses the principles of measuring the mean velocity and its vertical shear in a turbulent flow using an acoustic Doppler current profiler (ADCP), and presents an analysis of data gathered in a tidal channel. The assumption of horizontal homogeneity of the first moments is...
- Detiding Three-Dimensional Velocity Survey Data in Coastal Waters*.
Munchow, Andreas // Journal of Atmospheric & Oceanic Technology; May2000, Vol. 17 Issue 5, p736
A three-dimensional data interpolation technique is proposed that efficiently removes tidal currents from spatial velocity surveys. The least squares method extends prior two-dimensional detiding methods to three spatial dimensions using biharmonic splines. Biharmonic splines are fitted to...
- Flow Dynamics in the Strait of Georgia, British Columbia.
Stacey, Michael W.; Pond, Stephen; LeBlond, Paul H. // Atmosphere -- Ocean (Canadian Meteorological & Oceanographic Soc; Mar1991, Vol. 29 Issue 1, p1
The balance of forces responsible for the vertical structure of the mean currents in the Strait of Georgia is examined using data collected from an array of four cyclesonde (profiling current meter) and five Aanderaa current-meter moorings. Tests using the thermal wind equations show that a...
- Estuarine and Tidal Currents in the Broughton Archipelago.
Foreman, M. G. G.; Stucchi, D. J.; Zhang, Y.; Baptista, A. M. // Atmosphere -- Ocean (Canadian Meteorological & Oceanographic Soc; Mar2006, Vol. 44 Issue 1, p47
Current meter observations, Conductivity-Temperature-Depth (CTD) profiles, and river discharges are combined with two numerical models to understand better the estuarine and tidal circulation in the Broughton Archipelago, a complex region of islands, channels, and fiords that has become a...
- Barotropic Tides on the North Carolina Shelf.
Lentz, Steve; Carr, Matthew; Herbers, T. H. C. // Journal of Physical Oceanography; Jul2001, Vol. 31 Issue 7, p1843
Observations from 18 near-bottom pressure sensors and 8 current meter moorings provide a characterization of the barotropic tides over the North Carolina continental shelf between Chesapeake Bay and Cape Hatteras. The largest tidal constituents in this region are the M[sub 2] (sea level...
- A Detailed Comparison of a Range of Three-Dimensional Models of the M[sub 2] Tide in the Faeroe�Shetland Channel and Northern North Sea.
Davies, Alan M.; Kwong, Simon C. M.; Lee, Jong Chan // Journal of Physical Oceanography; Jul2001, Vol. 31 Issue 7, p1747
A three-dimensional hydrodynamic model of the Faeroe�Shetland Channel and northern North Sea is used to investigate the spatial variability of M[sub 2] tidal elevations and currents in the region. This area is chosen because it covers a range of water depths. Also, there is a significant...
- Characteristics and mechanisms of the upwelling in the southern Taiwan Strait: a three-dimensional numerical model study.
Jiang, Yuwu; Chai, Fei; Wan, Zhenwen; Zhang, Xin; Hong, Huasheng // Journal of Oceanography; Dec2011, Vol. 67 Issue 6, p699
Using a nested circulation model based on the Princeton Ocean Model, we investigate the characteristics and mechanisms of two main upwellings in the southern Taiwan Strait: the Southwest upwelling and the Taiwan Bank upwelling. The Southwest upwelling exists in summer when the southwesterly...
- New Seagen record.
Jiang, Yuwu; Chai, Fei; Wan, Zhenwen; Zhang, Xin; Hong, Huasheng // Modern Power Systems; Jan2013, Vol. 33 Issue 1, p5
The article informs that SeaGen, a tidal current installation in Strangford Lough, Northern Ireland has set several new records in power generation including highest generation in a single day, biggest leap in generation and total power generation.
- Nonlinear interaction of the Tsugaru Warm Current and tide in the Tsugaru Strait.
Wada, Ryota; Waseda, Takuji; Nanjo, Hirotada // Ocean Dynamics; Jun2012, Vol. 62 Issue 6, p923
The Tsugaru Strait, which connects the Sea of Japan with the Pacific Ocean, is characterized by the eastward Tsugaru Warm Current (TWC) and oscillating tidal currents of similar magnitude. A 15-day current observation was conducted in one of the two narrow channels in the strait, at the...
- Horizontal transport of marine organisms resulting from interactions between diel vertical migration and tidal currents off the west coast of Vancouver Island.
Smith, C.L.; Hill, A.E.; Foreman, M.G.G.; Pe�a, M.A. // Canadian Journal of Fisheries & Aquatic Sciences; Apr2001, Vol. 58 Issue 4, p736
Examines the horizontal transport of marine organisms resulting from interaction between diel vertical migration and numerically generated tidal and buoyancy currents for the southern continental shelf and slope of Vancouver Island, Canada. Hypothesis that the mechanism is partially responsible...
- Landscape allometry: from tidal channel hydraulic geometry to benthic ecology.
Hood, W. Gregory // Canadian Journal of Fisheries & Aquatic Sciences; Aug2002, Vol. 59 Issue 8, p1418
Investigates the potential linkage of the scaling of tidal channel form with ecological patterns and processes in estuarine tidal channels of the lower Chehalis River, Washington. Correlation of ebb tide surface velocity to exit time and the export probability of tiny drogues; Negative scaling...
- Aspects of the Mean Wintertime Circulation along Australia's Southern Shelves: Numerical Studies.
Cirano, Mauro; Middleton, John F. // Journal of Physical Oceanography; Mar2004, Vol. 34 Issue 3, p668
A high-resolution numerical model is used to study the mean wintertime shelf-slope circulation between the Gulfs of South Australia and the west coast of Tasmania. The mean downwelling-favorable winds for the region result in a continuous eastward coastal current (CC) extending from Cape Leeuwin...
- Holocene tidal levels and sedimentation rates using a diatom-based palaeo-environmental reconstruction: the Tees estuary, northeastern England.
Plater, A.J.; Wright, M.R.; Horton, B.P.; Zong, Y.; Rutherford, M.M.; Haworth, E.Y.; Appleby, P.G. // Holocene; Jul2000, Vol. 10 Issue 4, p441
An established diatom-based tidal level transfer function is used in combination with the present-day relationship between sedimentation rate and altitude to reconstruct Holocene tidal sediment accretion for the Tees estuary, northeastern England. The results from five cores reveal two periods...
- Harnessing tidal power in shallow waters.
Knight, Helen // Engineer (00137758); 3/29/2002, Vol. 291 Issue 7595, p9
Reports on a device being developed in Great Britain that could allow tidal current turbines to be used in shallow waters. Advantage of tidal currents; Difficulty with tidal power; Benefits of the device.
- Modelling tidally induced sediment-transport paths over the northwest European shelf: the influence of sea-level reduction.
Hall, Philip; Davies, Alan M. // Ocean Dynamics; May2004, Vol. 54 Issue 2, p126
A three-dimensional model covering the northwest European Shelf and part of the adjacent Atlantic Ocean is used to examine the influence of water depth change upon the distribution of maximum tidal bed stress. The direction of bed stress is an indicator of sediment movement as bed load and...
- Tidal currents, energy flux and bottom boundary layer thickness in the Clyde Sea and North Channel of the Irish Sea.
Davies, Alan M.; Hall, Philip; Howarth, M. John; Knight, Philip J.; Player, Rose J. // Ocean Dynamics; May2004, Vol. 54 Issue 2, p108
A high-resolution three-dimensional model of the Clyde Sea and the adjacent North Channel of the Irish Sea is used to compute the major diurnal and semidiurnal tides in the region, the associated energy fluxes and thickness of the bottom boundary layer. Initially, the accuracy of the model is...
- Lateral variability of flow over a sill in a channel of southern Chile.
C�ceres, Mario; Valle-Levinson, Arnoldo; Molinet, Carlos; Castillo, Manuel; Bello, Monica; Moreno, Carlos // Ocean Dynamics; Jul2006, Vol. 56 Issue 3/4, p352
Measurements of velocity and density profiles were used to describe the tidal and mean flow structure across and along a sill in Refugio Channel, a fjord-like inlet in Southern Chile (43.9�S). These are the first oceanographic measurements of any kind effected in Refugio Channel. Current...
- Synoptic hydrography of a highly stratified estuary.
Schettini, Carlos Augusto Fran�a; Ricklefs, Klaus; Truccolo, Eliane Cristina; Golbig, Volker // Ocean Dynamics; Jul2006, Vol. 56 Issue 3/4, p308
This study investigates the hydrodynamic characteristics of the lower, middle, and upper sectors of a highly stratified estuary, the Itaja�-A�u river estuary (south of Brazil ~27� S/48.5� W). The study is based on a 25-h field campaign with three sampling stations positioned at 2, 17,...
- Flow velocity profiles in the Lower Scheldt estuary.
Winterwerp, Johan Christian; Zheng Bing Wang; Van der Kaaij, Theo; Verelst, Kristof; Bijlsma, Arnout; Meersschaut, Youri; Sas, Marc // Ocean Dynamics; Jul2006, Vol. 56 Issue 3/4, p284
Recent acoustic Doppler current profiler (ADCP)-measurements in the Scheldt estuary near Antwerp, Belgium, revealed anomalous, i.e. anti-clockwise circulations in a left bend during the major part of the flood period; these circulations were established shortly after the turn of the tide. During...
- Morphodynamic relationships for ebb and flood delta volumes at Florida�s tidal entrances.
Powell, Mark A.; Thieke, Robert J.; Mehta, Ashish J. // Ocean Dynamics; Jul2006, Vol. 56 Issue 3/4, p295
Tidal entrances constitute an important boundary condition for the coastal ocean regime. Based on data from 67 sandy entrances in Florida, morphodynamic relationships between tidal prism, entrance throat area, and ebb and flood delta volumes are revisited. The main source of sand in these deltas...
- Development of a modelling methodology for simulation of long-term morphological evolution of the southern Baltic coast.
Wenyan Zhang; Harff, Jan; Schneider, Ralf; Chaoyu Wu // Ocean Dynamics; Oct2010, Vol. 60 Issue 5, p1085
The Darss-Zingst peninsula at the southern Baltic Sea is a typical wave-dominated barrier island system which includes an outer barrier island and an inner lagoon. The formation of the Darss-Zingst peninsula dates back to the Littorina Transgression onset about 8,000 cal BP. It originated from...
- Tidal power from shallows.
Wenyan Zhang; Harff, Jan; Schneider, Ralf; Chaoyu Wu // Professional Engineering; 3/8/2006, Vol. 19 Issue 5, p44
No abstract available.
- Rip Currents and Beach Safety Education.
Fletemeyer, John; Leatherman, Stephen // Journal of Coastal Research; Jan2010, Vol. 26 Issue 1, p1
The authors reflect on the high percentage of death occur in the U.S. due to rip drownings. They believe that beach safety and warning programs are not reliable indicators for identifying rip currents and mentions the need to re-evaluate how bathers are warned about the dangerous currents. The...