The effect of vertical resolution on the simulation of M<sub>2</sub> tide in Changjiang Estuary

LIU Baochao; LI Jianping; FENG Licheng

doi:10.3969/j.issn.0253-4193.2013.04.003

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LIU Baochao, LI Jianping, FENG Licheng. The effect of vertical resolution on the simulation of M2 tide in Changjiang Estuary[J]. Haiyang Xuebao, 2013, 35(4): 19-28. doi: 10.3969/j.issn.0253-4193.2013.04.003

Citation:

LIU Baochao, LI Jianping, FENG Licheng. The effect of vertical resolution on the simulation of M₂ tide in Changjiang Estuary[J]. Haiyang Xuebao, 2013, 35(4): 19-28. doi: 10.3969/j.issn.0253-4193.2013.04.003

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The effect of vertical resolution on the simulation of M₂ tide in Changjiang Estuary

doi: 10.3969/j.issn.0253-4193.2013.04.003

1.
State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics, Institute of Atmospheric Physics. Chinese Academy of Sciences, Beijing 100029, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China
2.
State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics, Institute of Atmospheric Physics. Chinese Academy of Sciences, Beijing 100029, China
3.
National Marine Environmental Forecast Center, Beijing 100081, China

Received Date: 2012-03-05
Rev Recd Date: 2012-07-05

Abstract

Abstract

A three-dimensional hydrodynamic model for Changjiang Estuary and the adjacent sea was developed within the framework of Environmental Fluid Dynamics Code (EFDC). The effect of vertical resolution on the simulation of M₂ tide was analyzed. The direction of M₂ tide propagation was simulated correctly. The M₂ tide propagated from southeast to northwest in open sea, then it propagated inland along coastline in Changjiang River and Hangzhou Bay. The bottom stress and turbulence varying with vertical resolution determined the energy propagated into Changjiang River and Hangzhou Bay. This made the amplitude of M₂ tide decrease with increasing vertical resolution in Changjiang River. But in Hangzhou Bay, the amplitude of M₂ tide increased with increasing vertical resolution at first, then decreased with increasing vertical resolution. The computation of bottom stress was based on the mixing length theory and the boundary layer was assumed to be a constant fluxes layer. The bottom layer should be thin enough so that the higher velocity of the upper water, which resulted in higher bottom stress, was of little importance in bottom layer. The intensity of vertical turbulence increased with increasing vertical resolution. This transmitted more high velocity of upper water into bottom layer and resulted in higher bottom stress again. Finally, the more consumption of energy caused by higher bottom stress made the amplitude of M₂ tide become smaller．
- M₂ tide,
- vertical resolution,
- bottom stress,
- EFDC,
- Changjiang Estuary

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