Academia.eduAcademia.edu

Outline

Title
Abstract
Background
Objectives
Funding Acknowledgements
Particle Tracking Methodology
Gabi-F Drifter Simulation -Solution Methods
Gabi-F Drifter Simulation -Summary
Existing Modeled Drifter Assessment Methodologies
The "Type I" Method
The "Statistical
Methodology Summary
Field Experimental Setup
Water Surface Slope & Tidal Forcing Data
Circle Assessment Methods & Drifter Model Setup
Implementing the Circle Assessment Method
Field Drifter Paths & Results
-DAY Composite Results
March 20, 2003 Results
March 25, 2003 (D3) Results
Field Drifter Paths & Analysis -Summary
Summary
Model Results & Discussion
Results Analysis with Spaghetti Diagrams
Statistical Separation Results
Circle Assessment Results -Overview
Causative Failure Analysis
Method Assessment Summary
Results of Analyses Using the
Modeling with Variable Elcom-MMP Setups -Summary
Conclusions and Recommendations
Summary Discussion
The Circle Assessment Method
Recommendations for Future Work
1.7. Spatial Interpolation Methods -Summary
Introduction
Methodology
Results and Discussion
Conclusions
References
All Topics
Geography

Drifter modeling and error assessment in wind driven currents

Profile image of Jordan FurnansJordan Furnans

2005

Abstract

Ben Hodges and Dr. Jörg Imberger, who provided both guidance and support while allowing me to find my own path. It has been a pleasurable research experience, and one I can truly call my own Thanks must also be extended to my fellow students at The University of Texas at Austin and at the University of Western Australia, to the Perth Water Corporation, and the Australian American Fulbright Association. Without your involvement, none of this would have been possible. To my family, there aren't any words that allow me to truly express my gratitude for all your support and encouragement. Mom, Dad, Jo -you have all played amazing behind-the scenes parts in my academic development, and I've always cherished your confidence in me and your constant positive energy. And to you Deb, my constant source for love and support, this dissertation is really ours as I could not have reached this stage without you. I love you for all that you are, e sempre te amaré. Gabriella, some day when you're older I'll tell you all about this little academic adventure!!! (But for know, we'll stick with Dr. Seuss). vi Drifter Modeling and Error Assessment in Wind Driven Currents Publication No.

Related papers

Modelling of wind-induced currents in water bodies
Roger A Falconer

Abstract This paper presents a numerical modelling study into wind-induced currents in shallow water basins. A three-dimensional semi-implicit finite difference numerical model is described, incorporating non-hydrostatic pressure, based on sigma-transformed system in the vertical direction. The numerical model is first validated for sloshing in a rectangular tank, excellent agreement obtained against analytical solutions, provided the non-hydrostatic pressure is incorporated. The model is further verified against experimental data on wind-induced circulation in shallow rectangular tanks. It is then used to simulate wind-induced three-dimensional flow fields in idealised rectangular tanks. A parameter study is carried out for wind-induced flows in Esthwaite Water, and the predictions compared against field data. It is shown that the numerical model is capable of accurately simulating the wind-induced circulation in shallow enclosed water bodies and that the topography and wind stress are of primary importance. The non-hydrostatic pressure does not have a significant effect on the wind-induced flow fields considered herein.

View PDFchevron_right
Early stages of wind wave and drift current generation under non-stationary wind conditions
Hubert Branger

2016

The generation and amplification mechanisms of ocean waves are well understood under a constant wind speed or in limited fetch conditions. Under these situations, the momentum and energy transfers from the air to the water are also quite well known. Many studies have been done to characterize the balance of the transfers between the generation of the surface drift current and the waves. However during the wind field evolution over the ocean, we may observe sometime high acceleration/deceleration situations of the wind velocity (e.g. Mexican Tehuano or Mediterranean Mistral wind systems). Under these non-stationary situations the evolution of wave systems is not well understood. For this reason we carried on laboratory experiments in a wave tank where it was possible to control and modify fast evolutions of wind velocity. The purpose of these experiments was to better understand the early stages of the generation of water-waves and surface-drift currents under non-stationary wind con...

View PDFchevron_right
Comment on “The response of drifting buoys to currents and wind” by Krauss et al
Pierre-Marie Poulain

Journal of Geophysical Research, 1990

View PDFchevron_right
Assessment of the Water-Following Capabilities of CODE Drifters Based on Direct Relative Flow Measurements
Riccardo Gerin

Journal of Atmospheric and Oceanic Technology

Direct measurements of the relative water flow near the top and bottom of Coastal Ocean Dynamics Experiment (CODE) drifters were made in the northeast Pacific Ocean and the Mediterranean Sea in wind speeds as large as 15 m s−1. These measurements confirmed that the CODE drifter is a good Lagrangian drifter with a mean downwind slip of about 0.1% of the wind speed. Substantial mean vertical shears across the drifter (top 1 m below the surface) were observed, reaching an amplitude of 12 cm s−1 and corresponding to strong stratification (due to the proximity of river runoff) and strong winds.

View PDFchevron_right
Field measurements of the vertical shears for a drift current
V. A Dulov, Victor Shrira

2007

We describe the procedure of field experiments aimed at measuring the vertical profiles of the vectors of a drift current with the help of quasi-Lagrangian drifters. We present the data on the vertical shears of the current at depths of 0.5-5 m obtained under the conditions of neutral stratification in the upper 5-m layer of the sea in the presence of weak and moderate winds. The correspondence of the obtained data to the concept according to which the subsurface layer of the sea is regarded as a near-wall turbulent layer with Ekman current located below is analyzed. A conclusion is made that the results of measurements correspond, on the average, to the classical concepts demonstrating both the region of logarithmic sublayer and its transition into the Ekman spiral.

View PDFchevron_right
Interactive comment on “ Submesoscale dispersion of surface drifters in a coastal sea near offshore wind farms ” by Ulrich Callies
Ulrich Callies

2018

This is a very nice paper on dispersion characteristics in German Bight. What makes this paper quite special is the existence of offshore wind farms (OWFs) in the region, even though these effects do not really show up in the results. Also, the authors did an excellent job in executing the paper as well discussing at length with respect to all previous work (maybe with the exception of some, as suggested below). Some of this discussion is fueled by the inconclusive nature of the results, which seem to be mainly due to the small number of drifters; something that could be improved in the future. Nevertheless, overall it is a great, careful study and I recommend acceptance subject to possible modification as per my minor comments below:

View PDFchevron_right
Observed and modeled drifters at a tidal inlet
Steve Elgar

Journal of Geophysical Research: Oceans, 2015

Material transport and dispersion near the mouth of a tidal inlet (New River Inlet, NC) are investigated using GPS-tracked drifters and numerical models. For ebb tide releases, velocities are largest (>1 m s 21) in two approximately 30 m wide channels that bisect the 1-3 m deep ebb shoal. In the channels, drifter and subsurface current meter velocities are similar, consistent with strong vertical mixing and 2-D hydrodynamics. Drifters were preferentially entrained in the channelized jets where drifter cluster lateral spreading rates l in were small (l in % 0:5 m 2 s 21). At the seaward edge of the ebb shoal, jet velocities decrease linearly with distance (to 0:2 m s 21 , about 1 km from shore), and cluster spreading rates are larger with l out % 3 m 2 s 21. Although the models COAWST and NearCom generally reproduce the observed trajectory directions, certain observed drifter properties are poorly modeled. For example, modeled mean drifter velocities are smaller than observed, and upon exiting the inlet, observed drifters turn north more than modeled drifters. The model simulations do reproduce qualitatively the spreading rates observed in the inner inlet, the flow deceleration, and the increase in l out observed in the outer inlet. However, model spreading rates increase only to l out < 1 m 2 s 21. Smaller modeled than observed l out may result from using unstratified models. Noncoincident (in space) observations show evidence of a buoyant plume (Dq51 kg m 23) in the outer inlet, likely affecting drifter lateral spreading. Generally, drifter-based model performance is good within the inlet channels where tidal currents are strongest, whereas model-data differences are significant farther offshore.

View PDFchevron_right
Lagrangian Drifter Modelling of an Experimental Rip Current
Rodrigo Cienfuegos

Coastal Engineering Proceedings, 2012

A non-uniform alongshore wave forcing on an experimental uneven mobile bathymetry create mean circulation on a rip channel. A 2D numerical hydrodynamic model that integrates the non-linear shallow-water equations in a shock-capturing finite-volume framework is used to validate the nearshore circulation, and drifters displacement.

View PDFchevron_right
Surface current dynamics under sea breeze conditions observed by simultaneous HF radar, ADCP and drifter measurements
alexei sentchev

Ocean Dynamics, 2017

Ocean surface boundary layer dynamics off the southern coast of France in the NW Mediterranean is investigated by using velocity observations by high-frequency (HF) radars, surface drifting buoys and a downward-looking drifting acoustic Doppler current profiler (ADCP). The analysis confirms that velocities measured by HF radars correspond to those observed by an ADCP at the effective depth z f = k −1 , where k is wavenumber of the radio wave emitted by the radar. The radials provided by the radars were in a very good agreement with in situ measurements, with the relative errors of 1 and 9 % and root mean square (RMS) differences of 0.02 and 0.04 m/s for monostatic and bistatic radar, respectively. The total radar-based velocities appeared to be slightly underestimated in magnitude and somewhat biased in direction. At the end of the survey period, the difference in the surface current direction, based on HF radar and ADCP data, attained 10°. It was demonstrated that the surface boundary layer dynamics cannot be reconstructed successfully without taking into the account velocity variation with depth. A significant misalignment of ∼30°caused by the sea breeze was documented between the HF radar (HFR-derived) surface current and the background current. It was also found that the ocean response to a moderate wind forcing was confined to the 4-m-thick upper layer. The respective Ekman current attained the maximum value of 0.15 m/s, and the current rotation was found to be lagging the wind by approximately 40 min, with the current vector direction being 15-20°to the left of the wind. The range of velocity variability due to wind forcing was found comparable with the magnitude of the background current variability.

View PDFchevron_right
8th European-African Conference on Wind Engineering (8EACWE2022), September 20-23, 2022 Proceedings
Adriana Chitez

Zenodo (CERN European Organization for Nuclear Research), 2022

In 1993 he obtained a Research Master Degree in fluid dynamics at the von Karman Institute for Fluid Dynamics (VKI). His PhD degree is from TU/Eindhoven, following research on optical diagnostics of particles and droplets, carried out in collaboration with VKI. Since 1997 he is professor at VKI. In 2018 he became head of the Environmental & Applied Fluid Dynamics Department and Dean of Faculty. His current areas of research include weather modeling, LIDAR-Doppler instrumentation, microclimate assessment, CFD modelling of wind farm flows, and scaled testing in atmospheric boundary layer wind tunnels and water flumes for coastal and offshore engineering.

View PDFchevron_right

References (105)

  1. Addison PS. (1996) "A method for modeling dispersion dynamics in coastal waters using fractional Brownian motion". IAHR Journal of Hydraulic Research 1996; 34: 549-561.
  2. Aldrige, J.N,.
  3. Kershaw, P., Brown, J., McCubbin, D., Leonard, K.S., Young, E.F. (2003) "Transport of plutonium ( 239/240 Pu) and caesium ( 137 Cs) in the Irish Sea: comparison between observations and results from sediment and contaminant transport modeling." Continental Shelf Research. 23, 869-899. Elsevier Science Ltd.
  4. Alongi, D.M. (1998) "Coastal Ecosystem Processes" CRC Press Amorocho, J., and DeVries, J.J. (1980) "A New evaluation of the wind stress coefficient over water surfaces" Journal of Geophysical Research. 85, 433-442.
  5. Antenucci, J. P., Imberger, J., and Saggio, A., (2000). "Seasonal evolution of the basin- scale internal wave field in a large, stratified lake. Limnology and Oceanography. 45. 1621- 1638. Arakawa and V. Lamb. Computational design of the basic dynamical processes of the ucla general circulation model. In Methods in Computational Physics, volume 17, pages 174-267. Academic Press, 1977.
  6. Assouline, S., and Mahrer, Y., (1996) "Spatial and temporal variability in microclimate and evaporation over Lake Kinneret: Experimental evaluation. Journal of Applied Meteorology. 35: 1076-1084.
  7. Batchelor, G.K., (1952) "Diffusion in a field of homogeneous turbulence II: The Relative motion of particles", Proc. Cambridge Philos. Soc. 48, 345-362.
  8. Bennett, John. R., and Clites, Anne Hutchinson. (1987). "Accuracy of Trajectory Calculation in a Finite-Difference Circulation Model". Journal of Computational Physics 68, 272-282.
  9. Bergeson, L. (2001) "One Hot Issue: TMDL Litigation"., Pollution Engineering. February/March 2001.
  10. Borsuk, M.E., Stow, C.A., and Reckhow, K.H., (2003). "An Integrated approach to TMDL development for the Neuse River estuary using a Bayesian probability network model (Neu-BERN)." Journal of Water Resources Planning and Management. 129, 283- 294.
  11. Borsuk, M., Stow, C., and Reckhow, K., (2004)"Confounding Effect of Flow on Estuarine Response to Nitrogen Loading" Journal of Enivronmental Engineering., Vol.
  12. Bowen, J.D., (2003) " A CE-Qual-W2 Model of the Neuse Estuary for TMDL development" Journal of Water Resources Planning and Management Vol 129, No 4. July Caissie, D., Satish, M., El-Jabi, N. (2005) "Predicting river water temperatures using the equilibrium temperature concept with application on Miramichi River catchments (new Brunswick, Canada)" Hydrological Processes 19 (11) 2137-2159.
  13. Carey, G., and Shen, Y. (1995) "Simulation of fluid mixing using least0squares finite elements and particle tracing" International Journal for Numerical Methods in Heat and Fluid Flow. Volume 5, 549-573.
  14. Casulli, V., and Cheng, R.T., (1992) "Semi-implicit finite difference methods for three- dimensional shallow water flow." International Journal for Numerical Methods in Fluids, 15(6), 629-648
  15. Chen, Changsheng, Xu, Qichun, Beardsley, Robert C., Franks, Peter J.S.,(2003) "Model study of the cross-frontal water exchange on Georges Bank: A three-dimensional Lagrangian experiment." Journal of Geophysical Research, vol 108, No. C5.
  16. Colin De Verdiere, A. (1983) "Lagrangian eddy statistics from surface drifters in the eastern North Atlantic". Journal of Marine Research. V. 41, 375-398
  17. Csanady, G.T. (1963) "Turbulent diffusion in Lake Huron", Journal of Fluid Mechanics. 17, 360-384.
  18. CWR#1, 2003 -LDS User's Guide -Centre for Water Research, The University of Western Australia.
  19. D'Asaro, E.A., Farmer, D.M., Osse, J.T., and Dairiki, G.T. (1996) "A Lagrangian Float." Journal of Atmospheric and Oceanic Technology. 13, 1230-1246.
  20. Deng, Q., and Fang, G. (2001) "Numerical visualization of mass and heat transport for conjugate natural convection/heat conduction by streamline and heatline". International Journal of Heat and Mass Transfer 45 2373-2385.
  21. Dever, E.P., Hendershott, M.C., and Winant, C.D. (1998) tatistical aspects of the surface drifter observations of circulation in the Santa Barbara Channel" Journal of Geophysical Research 103, 24781-24797.
  22. Fischer, H.B., List, E.J., Koh, R.C.Y, Imberger, J., and Brooks, N.H., (1979) "Mixing in inland and coastal waters" Academic Press
  23. Franke R., and Nielsen, G.M. (1980), Scattered data interpolation of large sets of scattered data. International Journal of Numerical Methods in Engineering, 15, 1691- 1704.
  24. Freeland, H., Rhines, P., and Rossby, T. (1975) "Statistical observations of the trajectories of neutrally buoyant floats in the North Atlantic. Journal of Marine Research. V. 33m 383-404.
  25. Fuentes O., Marinone S. (1999) "A numerical Study of the Lagrangian Circulation in the Gulf of California" Journal of Marine Systems 22, 1-12.
  26. Garraffo, Zulema D., Mariano, Arthur J., Griffa, Annalisa, Veneziani, Carmela, Chassignet, Eric P. (2001). "Lagrangian data in a high-resolution numerical simulation of the North Atlantic. 1. Comparison with in situ drifter data"., Journal of Marine Systems, 29 pg 157-176.
  27. Godfrey, J.S., Ridgway, K.R., (1985) "The large scale environment of the poleward- flowing Leeuwin Current, Western Australia: Longshore steric height gradients, wind stresses, and geostrophic flow. Journal of Physical Oceanography, 15, 481-495.
  28. Harcourt, Ramsey R., Steffen, Elizabeth L., Garwood, Roland W., D'Asaro, Eric A., (2002)"Fully Lagrangian Floats in Labrador Sea Deep Convection: Comparison of Numerical and Experimental results." Journal of Physical Oceanography 32, pg 493-510.
  29. Havens, K.E., and Walker, WW. (2002) "Development of a total phosphorous concentration goal in the TMDL process for Lake Okeechobee, Florida (USA)." Lake and Reservoir Management. 19 (3) 227-238.
  30. Haynes, R., and Barton, E.D., (1991) "Lagrangian observations in the Iberian coastal transition zone" Journal of Geophysical Research 96, 14731-14741
  31. Hillmer, I, and Imberger, J (2005) "Influence of advection on time and space scales of ecological variables in a coastal equilibrium flow" (Submitted)
  32. Hodges, B.R. (1998), Heat Budget and Thermodynamics at a Free Surface: Some Theory and Numerical Implementation. Centre for Water Research, University of Western Australia, Technical Report ED1300BH, 14 pgs.
  33. Hodges, B. R. (2000). "Numerical techniques in CWR-ELCOM". Technical report, Centre for Water Research, University of Western Australia, Nedlands, Western Australia, 6907. Reference WP 1422-BH.
  34. Hodges, B.R., Imberger, J., Saggio, A., Winters, K., (2000). "Modeling basin-scale internal waves in a stratified lake." Limnol. Oceanogr. 45: 1603-1620.
  35. Hodges, B.R., Imberger, J. (2001). "Simple Curvilinear Method for Numerical Methods of Open Channels". Journal of Hydraulic Engineering. Vol 127, No. 11.
  36. Hodgkin, E.P., and DiLollo, V. (1958) "The tides of south-western Australia". Journal of the Royal Society of Western Australia, 41, 42-54.
  37. Holt, JT, Allen, JI, Proctor, R, Gilbert, F. "Error Quantification of a high-resolution coupled hydrodynamic-ecosystem coastal ocean model: Part 1 model overview and assessment of the hydrodynamics." Journal of Marine Systems 57 (1-2): 167-188. AUG 2005.
  38. Hughes, C.E., Aierey, P.L., Duran, E.B., Miller, B.M., Sombrito, E., (2004) "Using Radiotracer techniques for coastal hydrodynamic model evaluation" Journal of Environmental Radioactivity. 76 195-206. Elsevier Science Ltd Jiang, D., Liu, H., Wang, W. (2001) "Test a modified surface wind interpolation scheme for complex terrain in a stable atmosphere". Atmospheric Environment 35, 4877-4885. Elsevier Science, Ltd.
  39. Johnson, Billy H., Kim, Keu W, Heath, Ronald E., Hsieh, Bernard B., and Butler, H. Lee (1993). "Validation of Three-Dimensional Hydrodynamic Model of Chesapeake Bay." Journal of Hydraulic Engineering. V. 119, no. 1. pg 2-20.
  40. Johnson, D., Stocker, R., Head, R., Imberger, J., and Pattiaratchi, C. (2003) "A compact, low-cost gps drifter for use in the Oceanic Nearshore Zone, Lakes, and Estuaries". Journal of Atmospheric and Oceanic Technologies (Submitted).
  41. Klein, P., and Hua, B.L. (1990) "The mesosacale variability of the sea surface temperature: an analytical and numerical model". Journal of Marine Research. 48, 729- 763. Kowalik, Z., and Murty, T. S. (1993). Numerical modeling of ocean dynamics. World Scientific.
  42. Krauss, W. and Boning, C.W. (1987) "Lagrangian properties of eddy fields in the Northern Atlantic as deduced from satellite tracked buoys. Journal of Marine Research., V 45, 249-291.
  43. Kundu, P, and Cohen, I., (2002) Fluid Mechanics, 2 nd edition.
  44. Lacorata, G, Aurell, E., Vulpiani, A.(2001) "Drifter Dispersion in the Adriatic Sea: Lagrangian data and chaotic model" Annales Geophysicae 19: 121-129.
  45. Laval B, Imberger, J., Hodges, B.R., and Stocker, R., (2003) "Modeling circulation in lakes: Spatial and temporal variations", Limnol. Oceanogr. 48(3) 983-994.
  46. Lawrence, G.A., Ashley, K.I., Yonemitsu, N, and Ellis, J.R. (1995) "Natural dispersion in a small lake". Limnol. Oceanogr. 40. 1519-1526.
  47. Lee, J., and Neville-Jones,P. (1987) "Initial Dilution of horizontal jet in crossflow". Journal of Hydraulic Engineering/ V. 109, No. 2. 199-219.
  48. Lewis, E. (1988) Principles of Naval Architecture. The Society of Naval Architects and Marine Engineers.
  49. List, E.J., Gartrell, G. and Winant, C.D. (1990) "Diffusion and dispersion in coastal waters." Journal of Hydraulic Engineering 11, 1158-1179.
  50. Lord, D.A, and Hillman, K. (eds.) (1995). Perth Coastal Waters Study -Summary Report. Water Authority of Western Australia.
  51. Mankin, K.R., Wang, S.H., Koeliker, JK, Huggins, DG., and deNoyelles, F.,(2003) "Watershed-lake water quality modeling: Verification and application". Journals of Soil and Water Conservation 58 (4): 188-197. Jul-AuG.
  52. Manley, T.O., K. Hunkins, J. Saylor, G. Miller and P. Manley.(1999) "Aspects of summertime and wintertime hydrodynamics of Lake Champlain". Water Resources Monograph No. 14, American Geophysical Union, pp. 67-115
  53. Marti, C., and Imberger, J. (2004) "Connectivity provided by residual circulation in a stratified lake: Lake Kinneret, Israel". Centre for Water Research Reference ED 1617- CM. In press.
  54. Murthy, C.R. (1975) "Dispersion of floatables in lake currents" Journal of Physical Oceanography., 5 193-195.
  55. Murthy, C.R (1976) "Horizontal diffusion characteristics in Lake Ontario" Journal of Physical Oceanography. 6, 76-84.
  56. Muzzi, R.W., and McCormick, M. (1994) "A new glopal positioning system drifter buoy". Journal of Great Lakes Research. 3, 1-4
  57. Nairn, B., Kawase, M. (2001) "Comparison of Observed Circulation Patterns and Numerical Model Predictions in Puget Sound, WA." Proceedings of Puget Sound Research 2001 (http://www.psat.wa.gov on 11/5/2005).
  58. Okubo, A. (1971) "Oceanic diffusion diagrams" Deep Sea Research. 18, 789-802.
  59. Okumura, Y, and Endoh, S. (1995) "Telemetry Lagrangian measurements of water movement in lake using GPS and MCA." Trans. Soc. Instrument and Control Eng. 31, 1324-1328
  60. Okubo, A., and Ebbesmeyer, C.C. (1976) "Determination of vorticity, divergence and deformation rates from analysis of drogue observations" Deep Sea Research 23, 345-352.
  61. Ou, H.W., and Bennett, J.R., (1979) "A theory of the mean flow driven by long internal wavers in a rotating basin, with application to Lake Kinneret" Journal of Physical Oceanography. 9. 1112-1125.
  62. Paduan, J.D., and Niiler, P.P. (1993) "Structure of velocity and temperature in the Northeast Pacific as measured with Lagrangian drifters in Fall 1987", Journal of Physical Oceanography 23, 585-600.
  63. Pal, K.P., Murthy, R., and Thomson, R.E. (1998) "Lagrangian measurements in Lake Ontario" Journal of Great Lakes Research. 24, 681-697
  64. Palmer, M.D., Jarvis, R., and Thompson, L. (1987) "Drogue cluster and dye-dispersion measurements" Canadian Journal of Civil Engineering 14. 320-326
  65. Pan, H., Avissar, R., and Haidvogel, D.B., (2002). "Summer circulation and temperature structure of Lake Kinneret" Journal of Physical Oceanogrphy 32, 295-313.
  66. Paldor, N, Dvorkin, Y., Mariano, A., Ozgokmen, T., Ryan, E. (2004) "A practical, hybrid model for predicting the trajectories of near-surface ocean drifters" Journal of Atmospheric and Oceanic Technology. Volume 21.
  67. Pickett, P.J., 1997 "Pollutant Loading Capacity for the Black River, Chehalis River System, Washington". Journal fo the American Water Resources Association. 33 (2). 465-480. April.
  68. Poulain, P.-M., and Niiler, P.P.(1989), "Statistical analysis of the surface circulation in the California current system using satellite tracked-drifters.", Journal of Physical Oceanography, 19, 1588-1603
  69. Poulain, P.-M., Warn-Varnas,A., and Niiler, P.P.(1996), "Near-surface circulation of the Nordic seas as measured by Lagrangian drifters", J. Geophysical Research., 101(C8), 18237-18258
  70. Poulain, P (1999) "Drifter observations of surface circulation in the Adriatic Sea between December 1994 and March 1996" Journal of Marine Systems 20, 231-253.
  71. Provenzale, A. (1999) "Transport by coherent barotropic vortices". Annu. Rev. Fluid Mech. 31, 55-93.
  72. Ramsden, Dave., Holloway, Greg. (1991) "Timestepping Lagrangian Particles in Two Dimensional Eulerian Flow Fields", Journal of Computational Physics 95. 101-119
  73. Richez, C. (1998) "The West Spitzbergen Current as seen by SOFAR floats during the ARCTEMIZ 88 Experiment: Statistics, differential kinematic properties, and potential vorticity balance." Journal of Geophysical Research 103, 15539-15565.
  74. Roberts, P., Snyder, W., and Baumgartner, D. (1989) "Ocean outfalls I: Submerged waterfield formation" Journal of Hydraulic Engineering, Vol. 115, No. 1, 1-25.
  75. Roulund, A., Sumer, B, Fredsoe, J., Michelson, J. (2005) "Numerical and experimental investigation of flow and scour around a circular pile" Journal of Fluid Mechanics 534, 351-401.
  76. Sahin, I., Crane, J., Watson, K. (1993) "Added mass coefficients for submerged bodies by a low-order panel method". AIAA 31 st Aerospace Sciences Meeting and Exhibit, Reno NV, Jan 11-14. 9 pages.
  77. Sanderson, B.G., & Okubo, A. (1986) "An analytical calculation of two dimensional dispersion. J. Oceanogr. Soc. Japan. 42 139-153.
  78. Sanderson, B.G., (1987) "An analysis of Lagrangian kinematics in Lake Erie." Journal of Great Lakes Research. 13, 559-567
  79. Sanderson, B.G. (1995) Structure of an eddy measured with drifters" Journal of Geophysical Research 100, 6761-6776
  80. Serruya, S. (1975) "Wind, water temperature and motions in Lake Kinneret: general pattern." Verh. Internat. Verein. Limnol. 42, 139-153.
  81. Shepard, D. (1968) A Two-dimensional function for irregularly spaced data. In Proc. ACM Nat. Conf., Pages 517--524, 1968
  82. Siddorn, J.R., Allen, J.I., and Uncles, R.J. (2003) "Heat, Salt and Tracer Transport in the Plymouth Sound Coastal region: a 3-D modeling study". J. Mar. Biol. Ass. UK. 83, 673- 682.
  83. Simanjuntak, A, Imberger, J (2006) -Ongoing research at the Centre for Water Research at the University of Western Australia. Publications pending.
  84. Simpson, J.J., and J.I. Gobat, 1994: Robust velocity estimates, stream functions and simulated Lagrangian drifters from sequential spacecraft data. IEEE Trans. on Geosci. Rem. Sens., 32: 479-493.
  85. Smith R.L., Huyer, A., Godfrey, J.S., Church, J.A., (1991). The Leeuwin Current off Western Australia. Journal of Physical Oceanography, 14, 623-628.
  86. Stacey, M.T., Cowen, E. A., Powell, T.M., Dobbins, E., Monismith, S.G., and Koseff, J.R. (2000). "Plume dispersion in a stratified, near-coastal flow: measurements and modeling" Continental Shelf Research. 20, 637-663.
  87. Stocker , R., and Imberger, J. (2003) "Horizontal transport and dispersion in the surface layer of a medium-sized lake" Limnology and Oceanography 48 (3), 971-982.
  88. Stow, A.C., Roessler, C., Borsuk, M., Bowen, J., and Reckhow, K., (2003). "Comparison of Estuarine Water Quality Models for Total Maximum Daily Load Development in Neuse River Estuary." Journal of Water Resources Planning and Management. 129, No.
  89. Su, Y. (1991) Model for Transport of Floating Debris in the Ocean. Ph.D. Dissertation, The University of Texas at Austin.
  90. Tambasco, M., Steinman, D. (2002)"On Assessing the Quality of Particle Tracking through Computational Fluid Dynamic Models" Journal of Biomechanical Engineering Vol 124. 166-175.
  91. Thompson, K., Sheng, J, Smith, P, Cong, L (2003) "Prediction of surface currents and drifter trajectories on the inner Scotian Shelf" Journal of Geophysical Research, Vol. 108. No C9, 3287.
  92. Thompson, R.O.R.Y., (1984). "Observations of the Leeuwin Current off Western Australia" Journal of Physical Oceanography, 14, 623-628.
  93. Thorpe, S., Heywood, K., Stevens, D., Brandon, M. (2004) "Tracking passinve drifters in a high resolution ocean model: implications for interannual variability of larval krill transport to South Georgia" Deep Sea Research I 52, 909-920.
  94. Toner, M., Kirwan Jr., A., Kantha, L, Choi, J. (2001) "Can general circulation models be assessed and their output enhanced with drifter data?" Journal of Geophysical Research, Vol. 106. No C9. 19,563-19579.
  95. Truesdell, C. (1954) The Kinematics of Vorticity. Indiana University Press.
  96. Umgiesser, G., and Zampato, L. (2001) "Hydrodynamic and salinity modeling of the Venice channel network with coupled 1D-2D mathematical models" Ecological Modelling 138, 75-85.
  97. Wang, P.F. (2001) "Dispersion resulting from aggregating hydrodynamic properties in water quality modeling". International Journal of Engineering Science 39, 95-112
  98. Willgoose, G., (1997) "A hydrodynamic particle tracking algorithm for simulating settling of sediment" Mathematics and Computers in Simulation 43., 343-349.
  99. Wool, T., Davie, S., and Rodriguez, H. (2003) "Development of Three-Dimensional Hydrodynamic and Water Quality Models to Support Total Maximum Daily Load Decision Process for the Neuse River Estuary, North Carolina". Journal of Water Resources Planning and Management. Vol 129, No.
  100. Yeung, P.K., and Pope, S.B., (1988) "An Algorithm for Tracking Fluid Particles in Numerical Simulations of Homogeneous Turbulence," Journal of Computational Physics vol. 79, 373-416.
  101. Yvergniaux, P, Chollet, J. (1989) "Particle Trajectories modeling based on a Lagrangian memory effect" XXIIIth IAHR Conference -Hydraulics and the Environment. Ottawa, Canada 21-25 August.
  102. Zaker, N., Imberger, J., and Pattiaratchi, C.,(2001) "Dispersion of an effluent plume in a shallow coastal area". Journal of Marine Environmental Engineering. Vol. 6, 83-108.
  103. Zaker, N., Imberger, J., and Pattiaratchi, C.,(2002) "Numerical Simulation of the Coastal Boundary Layer off Perth, Western Australia". Journal of Coastal Research. Vol. 18, n. 3 470-485.
  104. Zhenquan, Li., "A mass conservative streamline tracking method for two dimensional CFD velocity fields." Journal of Flow Visualization and Image Processing., v 9, n 1, 2002. 75-87.
  105. Zhurbas, V., and I.S. Oh, (2003) "Lateral diffusivity and Lagrangian scales in the Pacific Ocean as derived from drifter data. Journal of Geophysical Research, 108(C5) 3141.

Related papers

Including drag and inertia in drifter modelling
Jordan Furnans

Environmental Modelling &amp; Software, 2008

The influence of inertia and drag on modelled drifter movement is investigated through comparisons of field-observed drifter paths within Marmion Marine Park, Western Australia and those simulated using the Estuary and Lake Computer Model (ELCOM). Simulated drifter paths were generated with existing Lagrangian and leeway modelling techniques, as well as with the ''Generalized, Acceleration-Based Inertia and Forcing'' (GABI-F) model developed herein. The GABI-F drifter model predicts drifter movement by determining the forces acting on the drifter by the surrounding fluids and incorporates the influence of winds and inertia on drifter motion. Modelling results indicate the physically based GABI-F drifter modelling method is an improvement over existing Leeway and Lagrangian methods, however, the improvement is only significant when the underlying hydrodynamic model adequately resolves time/space complexities of the flow field. Quantitative model analyses are determined suitable only over short temporal and spatial scales, past which analyses of the drifter motion only provide qualitative information relating to the model's ability to reproduce the larger scale patterns of the field drifter motion.

View PDFchevron_right
Current measurements with surface and subsurface drifters
Kensuke Takeuchi

Journal of the Oceanographical Society of Japan, 1978

An examination of behaviors of a subsurface drogue and a subsequent examination of current measurement with a drifter comprising the drogue as its important part are made in the channel between Oshima and Izu Peninsula. The drogue submerged to the anticipated depth of 300 m within 10 minutes after launching. Since then the drogue kept its depth and operated normally. From the comparison with the velocity measurement by the use of a currentmeter moored at a station in the vicinity of the drifter's track, it is verified that the drifter's motion well reflects the motion of a water parcel around the drogue.

View PDFchevron_right
Drift-Flux Models
FAHAD MATOVU

2014

The report gives an insight into some concepts and characteristics of multiphase flow so that the applicability of a drift-flux model to a two-phase flow problem becomes easier to understand. Then focuses on a given drift-flux model and how this model was used to simulate a two-phase flow problem in matlab.

View PDFchevron_right
Surface drifters in the German Bight: model validation considering windage and Stokes drift
Ulrich Callies

Ocean Science

Six surface drifters (drogued at about 1 m depth) deployed in the inner German Bight (North Sea) were tracked for between 9 and 54 days. Corresponding simulations were conducted offline based on surface currents from two independent models (BSHcmod and TRIM). Inclusion of a direct wind drag (0.6 % of 10 m wind) was needed for successful simulations based on BSHcmod currents archived for a 5 m depth surface layer. Adding 50 % of surface Stokes drift simulated with a third-generation wave model (WAM) was tested as an alternative approach. Results resembled each other during most of the time. Successful simulations based on TRIM surface currents (1 m depth) suggest that both approaches were mainly needed to compensate insufficient vertical resolution of hydrodynamic currents. &lt;br&gt;&lt;br&gt; The study suggests that the main sources of simulation errors were inaccurate Eulerian currents and lacking representation of sub-grid-scale processes. Substantial model errors often occurred ...

View PDFchevron_right
Mediterranean Surface Currents Measured with Drifters: From Basin to Subinertial Scales
Riccardo Gerin

Oceanography, 2013

View PDFchevron_right

Related topics

  • Geography
    • 580 California St., Suite 400
    San Francisco, CA, 94104
    © 2025 Academia. All rights reserved