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Tidal Flow Patterns Near A Coastal Headland

Authors: Fu E. Tang, Daoyi Chen

Abstract:

Experimental investigations were carried out in the Manchester Tidal flow Facility (MTF) to study the flow patterns in the region around and adjacent to a hypothetical headland in tidal (oscillatory) ambient flow. The Planar laser-induced fluorescence (PLIF) technique was used for visualization, with fluorescent dye released at specific points around the headland perimeter and in its adjacent recirculation zone. The flow patterns can be generalized into the acceleration, stable flow and deceleration stages for each halfcycle, with small variations according to location, which are more distinct for low Keulegan-Carpenter number (KC) cases. Flow patterns in the mixing region are unstable and complex, especially in the recirculation zone. The flow patterns are in agreement with previous visualizations, and support previous results in steady ambient flow. It is suggested that the headland lee could be a viable location for siting of pollutant outfalls.

Keywords: Planar laser-induced Fluorescence, recirculation zone, tidal flow, wake flows

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1057519

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References:


[1] D., Chen, F. E. Tang, C. Chen, "PLIF study of pollutant trapping and 3- D plume structures in recirculation zones around a headland: steady and tidal currents", In Proc. of the Int. Symp. on Shallow Flows, ASCE, Holland, 2003
[2] D. Chen, F. E. Tang, C. Chen, "Pollutant trapping at a coastal headland", J. of Waterway, Port, Coastal and Ocean Eng., vol. 131, no. 3, pp. 98- 114, 2005
[3] L. Loubersac, "Application of high resolution satellite data in the observation of coastal environment. The case of SPOT simulations within the framework of ecological survey of Brittany coasts". Special publication, European Space Agency, 1983
[4] R. D. Pingree, G. T. Mardell, L. Maddock, "Tidal mixing in the channel isles region derived from the results of remote sensing and measurements at sea". Estuarine, Coastal and Shelf Science, vol. 20, pp. 1 - 18, 1985
[5] T. F. Duda, and C. S. Cox, "Vorticity measurement in a region of coastal ocean eddies by observation of near inertial oscillations", Geophys. Res. Lett., vol. 14, no. 8, pp. 793-796, 1987
[6] P. A. Davies, L. A. Mofor, "Observations of flow separation by an isolated island". Int. J. of Remote Sensing, vol. 11, no.5, 1990
[7] W. R. Geyer, R. Signell, "Measurements of tidal flow around a headland with a shipboard acoustic doppler current profiler". J. of Geophys. Res., vol. 95, no. C3, 1990
[8] M. Gade, W. Alpers, "Using ERS2-SAR images for routine observation of marine pollution in European coastal waters". The Sci. of the Total Environment. vol. 237/238, pp. 441 - 448, 1999
[9] Q. Y. Zhang, 2006. "Comparison of two three-dimensional hydrodynamic modeling systems for coastal tidal motion". Ocean Eng. vol. 33. pp. 137 - 151, 2006
[10] P. L. Murphy, A. Valle-Levinson, "Tidal and residual circulation in the St. Andrew Bay system, Florida". Continental Self Research, vol. 28. pp. 2678 - 2688, 2008
[11] Y. Coeffe, S. Courtier, B. Latteux, "Tidal sea mathematical modeling: current applications and future developments". Coastal Eng., vol. 11, pp. 479 - 511, 1987
[12] R. A. Falconer, E. Wolanski, L. Mardapitta Hadjipandeli, "Modelling tidal circulation in an island-s wake". J. of Waterway, Port, Coastal and Ocean Eng., vol. 112, Iss. 2, pp. 234-254, 1986
[13] R. A. Falconer, L. Mardapitta Hadjipandeli, "Bathymetric and shear stress effects on an island-s wake: a computational model study". Coastal Eng., vol. 11, pp. 57 - 86, 1987
[14] R. P. Signell, W. R. Geyer, 1991. "Transient eddy formation around headlands". J. of Geophys. Res., vol. 96, no. C2, 1991
[15] D. Galloway, E. Wolanski, B. King, "Modelling eddy formations in coastal waters: A comparison between model capabilities". Proc. of the conf. on Estuarine and Coastal Modelling, 1995, pp. 13 - 25.
[16] S. A. Socolofsky, G. H. Jirka, "Large-scale flow structures and stability in shallow flows". J. of Environmental Eng. Sci. vol. 3, Iss. 5, pp. 451 - 462, 2004
[17] G. H. Jirka, "Large-scale flow structures and mixing processes in shallow flows". J. of Hyd. Res. vol. 39, Iss. 6, pp. 567 - 573, 2001
[18] C. Dong, J. C. McWilliams, "A numerical study of island wakes in the Southern California Bight", Continental Shelf Research, vol. 27, no. 9, pp. 1233-1248, 2007
[19] M. J. Alaee, C. Pattiaratchi, G. Ivey, "Numerical simulation of the summer wake of Rottnest Island, Western Australia", Dynamics of Atmospheres and Oceans, vol. 43, no. 3-4, pp. 171-198, 2007
[20] I. M. Brooks, S. Soderberg, M. Tjernstrom, "The turbulence structure of the stable atmospheric boundary layer around a coastal headland: aircraft observations and modeling results", Boundary Layer Meteorology, vol. 107, pp. 531-559, 2003
[21] P. F. Coutis, J. H. Middleton, "The physical and biological impact of a small island wake in the deep ocean". Deep Sea Research I. vol. 49, pp. 1341 - 1361, 2002
[22] O. Leuchter, J. L. Solignac, "Experimental investigation of the turbulent structure of vortex wakes". Proc. of the 4th Int. Symp. on Turbulent Shear Flows, 1985, pp. 156 - 168.
[23] P. Menzel, F. Huttmann, M. Brede, A. Leder, "Experimental investigations of mixing processes in the wake of a circular cylinder in stratified flows". Proc. of the Conf. on Multiphase flow: The Ultimate Measurement Challenge, 2007, pp. 122 - 127.
[24] C. F. v. Carmer, A. C. Rummel, G. H. Jirka, "Mass transport in shallow turbulent wake flow by planar concentration analysis technique". J. of Hyd. Eng. vol. 135, no.4, pp. 257 - 270, 2009
[25] D. Chen, C. Chen, F. E. Tang, P. Stansby, M. Li, "Boundary Layer Structure of Oscillatory Open-Channel Shallow Flows over Smooth and Rough Beds", Experiments in Fluids, vol. 42, no. 5, pp. 719-736, 2007
[26] P. M. Lloyd, P. K. Stansby, D. Chen, "Wake formation around islands in oscillatory laminar shallow-water flows", J. of Fluid Mechanics, vol. 429, 2001
[27] P. M. Lloyd, P. K. Stansby, "Shallow-water flow around model conical islands of small side slope. I: surface piercing", J. of Hyd. Eng., vol. 23, no. 12, pp. 1057-1068, 1997
[28] F. E. Tang, "Visualization of tidal flow near a coastal headland", Proc. Of the Marine Waste Water Discharge (MWWD) Conf. 2010, Langkawi, Malaysia, 2010
[29] J. F. A. Sleath, "Turbulent oscillatory flow over rough beds", J. of Fluid Mechanics, vol. 182, 1987
[30] P. N. Papanicolaou, E. J. List, "Investigations of round vertical turbulent buoyant jets". J. of Fluid Mechanics, vol. 209, pp. 151 - 190, 1988
[31] Chen, D., Jirka, G.H., "Pollutant mixing in wake flows behind islands in shallow water", in Proc. of the Int. Symp. on Environmental Hydraulics, Hong Kong, 1991, pp. 371-377.
[32] Chen, D., Jirka, G.H., "LIF study of plane jet bounded in shallow water layer", J. of Hyd. Eng. vol. 125, no. 8, pp. 817-826, 1999
[33] D. G. MacDonald, G. H. Jirka, "Characteristics of headland wakes in shallow flow", In Proc. of the Congress of the IAHR, Netherlands, 1997, pp. 88 - 93.
[34] L. P. Xia, K. M. Lam, "Velocity and concentration measurements in initial region of submerged round jets in stagnant environment and in coflow", J. of Hydro-Environment Res., vol. 3, no. 1, pp. 21-34, 2009
[35] J.W. Kamphuis, "Friction factor under oscillatory waves". J. of the waterways, harbors and coastal eng. div. vol. 101, no. WW2, 1975
[36] P.M. Lloyd, P.K. Stansby, D. Chen, R.A. Falconer, J. Yin, Y. Chen, "Eddy formation around a conical headland in oscillatory shallow-water flow". Private communication, 2004