Abstract
Mean and fluctuating velocities were measured by use of a pulse coherent acoustic Doppler profiler (PC-ADP) and an acoustic Doppler velocimeter in the tidal bottom boundary layer of the Pearl River Estuary. The bed shear stresses were estimated by four different methods: log profile (LP), eddy correlation (EC), turbulent kinetic energy (TKE), and inertial dissipation (ID). The results show that (a) all four methods for estimating bed stresses have advantages and disadvantages, and they should be applied simultaneously to obtain reliable frictional velocity and to identify potential sources of errors; (b) the LP method was found to be the most suitable to estimate the bed stresses in non-stratified, quasi-steady, and homogeneous flows; and (c) in the estuary where the semi-diurnal tidal current is dominant, bed shear stresses exhibit a strong quarter-diurnal variation.
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Ali, A. and Lemckert, C. J., 2009. A traversing system to measure bottom boundary layer hydraulic properties, Estuar. Coast. Shelf Sci., 83(4):425–433.
Ackerman, J. D. and Hoover, T. M., 2001. Measurement of local bed shear stress in streams using a Preston-static tube, Limnol. Oceanogr., 46(8):2080–2087.
Biron, P. M., Lane, S. N., Roy, A. G., Bradbrook, K. F. and Richards, K. S., 1998. Sensitivity of bed shear stress estimated from vertical velocity profiles: the problem of sampling resolution, Earth Surf. Proc. Land., 23(2):133–139.
Cheng, R. T., Ling, C. H., Gartner, J. W. and Wang, P. F., 1999. Estimates of bottom roughness length and bottom shear stress in South San Francisco Bay, California, J. Geophys. Res., 104(C4):7715–7728.
Collins, M. B., Ke, X. and Gao, S., 1998. Tidally-induced flow structure over intertidal flats, Estuar. Coast. Shelf Sci., 46(2):233–250.
Doron, P. K., Bertuccioli, L., Katz, J. and Osborn, T. R., 2001. Turbulence characteristics and dissipation estimates in the coastal ocean bottom boundary layer from PIV data, J. Phys. Oceanogr., 31(8):2108–2134.
Elliott, A. J., 2002. The boundary layer character of tidal current in the Eastern Irish Sea, Estuar. Coast. Shelf Sci., 55(3):465–480.
Feddersen, F., Trowbridge, J. H. and Williams III, A. J., 2007. Vertical structure of dissipation in the nearshore, J. Phys. Oceanogr., 37(7):1764–1777.
Kang, S. K., Foreman, M. G. G., Lie, H. J., Lee, J. H., Cherniawsky, J. and Yum, K. D., 2002. Two-layer tidal modeling of the Yellow and East China Seas with application to seasonal variability of the M2 tide, J. Geophys. Res., 107(C3):6-1–6-18.
Kim, S. C., Friedrichs, C. T., Maa, J. P. Y. and Wright, L. D., 2000. Estimating bottom stress in tidal boundary layer from acoustic Doppler velocimeter data, J. Hydraul. Eng., ASCE, 126(6):399–406.
Liu, H., Wu, C. Y., Xu, W. M. and Wu, J. X., 2009. Contrasts between estuarine and river systems in near-bed turbulent flows in the Zhujiang (Pearl River) Estuary, China, Estuar. Coast. Shelf Sci., 83(4):591–601.
Lozovatsky, I. and Fermando, H. J. S., 2002. Mixing on a shallow shelf of the Black Sea, J. Phys. Oceanogr., 32(3):945–956.
Mao, Q. W., Shi, P., Yin, K. D., Gan, J. P. and Qi, Y. Q., 2004. Tides and tidal currents in Pearl River Estuary, Cont. Shelf Res., 24(16):1797–1808.
Mohrholz, V., Prandke, H. and Lass, H. U., 2008. Estimation of TKE dissipation rates in dense bottom plumes using a Pulse Coherent Acoustic Doppler Profiler (PC-ADP) — Structure function approach, J. Marine Syst., 70(3):217–239.
Nikora, V. I. and Goring, D. G., 1998. ADV measurements of turbulence: can we improve their interpretation? J. Hydraul. Eng., ASCE, 124(6):630–634.
Smith W. N., Katz, J. and Osborn, T. R., 2005. On the structure of turbulence in the bottom boundary layer of the coastal ocean, J. Phys. Oceanogr., 35(1):72–93.
Osborne, P. D. and Boak, E. H., 1999. Sediment suspension and morphological response under vessel generated wave groups: Torpedo Bay, Auckland, New Zealand, J. Coast. Res., 15(2):388–398.
Pope, N. D., Widdows, J. and Brinsley, M. D., 2006. Estimation of bed shear stress using the turbulent kinetic energy approach-a comparison of annular flume and field data, Cont. Shelf Res., 26(8):959–970.
Soulsby, R. L. and Dyer, K. R., 1981. The form of the near-bed velocity profile in a tidally accelerating flow, J. Geophys. Res., 86(C9):8067–8074.
Sherwood, C. R., Lacy, J. R. and Voulgaris, G., 2006. Shear velocity estimates on the inner shelf off Grays Harbor, Washington, USA, Cont. Shelf Res., 26(17):1995–2018.
Stapleton, K. R. and Huntley, D. A., 1995. Seabed stress determinations using the inertial dissipation method and the turbulent kinetic energy method, Earth Surf. Proc. Land., 20(9):807–815.
Thompson, C. E. L., Amos, C. L., Jones, T. E. R. and Chaplin, J., 2003. The manifestation of fluid-transmitted bed shear stress in a smooth annular flumed-a comparison of methods, J. Coastal Res., 19(4):1094–1103.
Thomsen, L., 1999. Processes in the benthic boundary layer at continental margins and their implication for the benthic carbon cycle, J. Sea Res., 41(1):73–86.
Xia, X. M., Li, Y., Yang, H., Wu, C. Y., Sing, T. H. and Pong, H. K., 2004. Observations on the size and settling velocity distributions of suspended sediment in the Pearl River Estuary, China, Cont. Shelf Res., 24(16):1809–1826.
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This study was financially supported by the National Basic Research and Development Program of China (Grant No. 2013CB956502), the National Natural Science Foundation of China (Grant Nos. 41276079 and 41176067), and the Open Research Foundation of Pearl River Hydraulic Research Institute (Grant No. 2013KJ07).
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Liu, H., Wu, Jx. Estimation of bed shear stresses in the pearl river estuary. China Ocean Eng 29, 133–142 (2015). https://doi.org/10.1007/s13344-015-0010-6
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DOI: https://doi.org/10.1007/s13344-015-0010-6