River‐tide dynamics: Exploration of nonstationary and nonlinear tidal behavior in the Yangtze River estuary

Journal of Geophysical Research: Oceans - Tập 120 Số 5 - Trang 3499-3521 - 2015
Leicheng Guo1,2, Mick van der Wegen3,2, David A. Jay4, Pascal Matte5, Zheng Bing Wang6,3,1, Dano Roelvink6,3,2, Qing He1
1State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China
2UNESCO-IHE, Delft, Netherlands
3Deltares, Delft, Netherlands
4Department of Civil and Environmental Engineering, Portland State University, Portland, Oregon, USA
5Centre Eau Terre Environment, Institut National de la Recherche Scientifique, Quebec City, Quebec, Canada
6Civil Engineering and Geosciences Faculty, Delft University of Technology, Delft, Netherlands

Tóm tắt

AbstractRiver‐tide dynamics remain poorly understood, in part because conventional harmonic analysis (HA) does not cope effectively with nonstationary signals. To explore nonstationary behavior of river tides and the modulation effects of river discharge, this work analyzes tidal signals in the Yangtze River estuary using both HA in a nonstationary mode and continuous wavelet transforms (CWT). The Yangtze is an excellent natural laboratory to analyze river tides because of its high and variable flow, its length, and the fact that there are do dams or reflecting barriers within the tidal part of the system. Analysis of tidal frequencies by CWT and analysis of subtidal water level and tidal ranges reveal a broad range of subtidal variations over fortnightly, monthly, semiannual, and annual frequencies driven by subtidal variations in friction and by variable river discharges. We employ HA in a nonstationary mode (NSHA) by segregating data within defined flow ranges into separate analyses. NSHA quantifies the decay of the principal tides and the modulation of M4 tide with increasing river discharges. M4 amplitudes decrease far upriver (landward portion of the estuary) and conversely increase close to the ocean as river discharge increases. The fortnightly frequencies reach an amplitude maximum upriver of that for over tide frequencies, due to the longer wavelength of the fortnightly constituents. These methods and findings should be applicable to large tidal rivers globally and have broad implications regarding management of navigation channels and ecosystems in tidal rivers.

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Journal of Geophysical Research: Oceans

Tập 120 Số 5

3499-3521

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