International Journal of Environmental Science and Development

Abstract—Estuarine velocity distribution is a comprehensive result of oblique pressure, wind stress and wave radiation caused by tidal, runoff and density gradient, which is corresponding to applied forces: tidal flow, runoff flow, density flow, wind-driven flow and wave-driven flow, all the factors contribute to the actual flow. Based on the hydrodynamic feature, the density flow and the wind-driven flow velocity formula in the complex estuarine waters, adopting log-linear model considering the effects of tidal acceleration and deceleration on tidal current profile, the enumerating method combined with the least square is adopted to separate estuarine flow velocity. Directly separating the runoff flow and tidal flow is not available, a second separation should be taken to deal with it because both of them contain the logarithmic items. Firstly, runoff is separated from the period-averaged residual flow, then tidal, wind-driven flows and density flow can be obtained from the instant flow velocity data. The results show that this method is simple in principle, practical in use and can be used to effectively analyze the field data.

Index Terms—Velocity separation, estuarine waters, log-linear model, enumeration method, the least square method.

Hao Jialing is with the National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing 210098, China. He is also with College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China (e-mail: jialingh@hhu.edu.cn).
He Bingju and Wang Dong are with the College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China (e-mail: 462193777@qq.com; 526544856@qq.com).

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Cite: Hao Jialing, He Bingju, and Wang Dong, "Theoretical Analysis on Separation of Complex Flow Velocity in Estuarine Waters," International Journal of Environmental Science and Development vol. 7, no. 1, pp. 31-35, 2016.