Seasonal variation of tidal prism and energy in the Changjiang River estuary: a numerical study

Min Zhang; Ian Howard Townend; Huayang Cai; Yunxuan Zhou

doi:10.1007/s00343-015-4302-8

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Seasonal variation of tidal prism and energy in the Changjiang River estuary: a numerical study

Updated：2023-05-16

- Seasonal variation of tidal prism and energy in the Changjiang River estuary: a numerical study
- Journal of Oceanology and Limnology Vol. 34, Issue 1, Pages: 219-230(2016)
- Affiliations：
  
  1. State Key Laboratory of Estuarine and Coastal Research East China Normal University
  2. Ocean and Earth Sciences University of Southampton
  3. Department of Water Management Faculty of Civil Engineering and Geosciences Delft University of Technology
- Author bio：
- Funds：
- DOI：10.1007/s00343-015-4302-8
  CLC：
- Online First：01 August 2015，
  
  Published：2016
- Accepted：
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Zhang, M., Townend, I.H., Cai, H. et al. Seasonal variation of tidal prism and energy in the Changjiang River estuary: a numerical study., Chin. J. Ocean. Limnol. 34, 219–230 (2016). https://doi.org/10.1007/s00343-015-4302-8
DOI：

Zhang, M., Townend, I.H., Cai, H. et al. Seasonal variation of tidal prism and energy in the Changjiang River estuary: a numerical study., Chin. J. Ocean. Limnol. 34, 219–230 (2016). https://doi.org/10.1007/s00343-015-4302-8 DOI：

摘要

Abstract

Tidal rivers are intrinsically complex because tidal propagation is influenced by river discharge. This study aims to examine the seasonal variation of tidal prism and energy variance in the tidal river of the Changjiang (Yangtze) River estuary in China. In order to quantify the behaviour of river and tide

we use numerical modelling that has been validated using measured data. We conduct our analysis by quantifying the discharge and energy variance in separate components for both the river and the tide

during wet and dry seasons. We note various definitions of tidal prism and explore the difference between tidal discharge on the flood and ebb and tidal storage volume. The results show that the river discharge attenuates the tidal motion and reduces the tidal flood discharge but the tidal storage volume is approximately constant with different riverine discharge since part of the fresh water discharge is intercepted and captured in the estuary due to the backwater effect. It appears that the tidal discharge adjusts according to the variation of river discharge to keep a constant tidal storage volume. An analysis of the hydraulics shows that the transition from tidal dominance (at the mouth) to river dominance (upstream) depends on the location of tidal current reversal which varies from wet season to dry season. Duringthe wet season

the Changjiang River estuary is totally dominated by energy from fresh water discharge.

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