大亚湾的潮汐动力学研究——I.潮波系统的观测分析与数值模拟*

doi:10.11978/2016078

Abstract

Abstract:

This paper is the first part of our studies on the tidal dynamics in Daya Bay (DYB), China. It illustrates the recent field work results. We establish a three-dimensional, fine resolution, unstructured grid, coastal ocean model to reproduce the tides in DYB. The combination of observation and simulation in this paper gives a better description on the tidal dynamic system in DYB than previous studies. Shallow water tides, especially the sexta-diurnal tides increase fast in DYB, which become the most notable characteristic of DYB tidal dynamic system. In the Fanhe Harbour at the northeastern DYB, the amplitude of M₆ tide reaches the maximum, at the same order as M₄ and S₂ tides. In the open sea outside DYB, the tidal current is dominated by a rotating shape; but once the current enters the bay, it turns to rectilinear quickly. In the main tidal channels, the magnitude of M₆ tidal current is even larger than those of M₄ and K₁ tides. The distribution of tidal energy flux indicates larger tidal energy dissipation for higher frequency tides. In DYB, both the tidal energy dissipation rate and the net tidal energy dissipated in a semi-diurnal period are much larger by M₆tide than by M₄, M₂ and K₁ tides. The observed Euler residual currents show different spring-neap variation in magnitude inside DYB, and reveal the influence of the coastal current outside the bay. The numerical simulation shows a multi-vortex of residual current, and indicates poor water exchange in the bay.

Key words: Daya Bay, tidal dynamic system, shallow water tide, sexta-diurnal tide, numerical simulation

Wen WU, Yuhan YAN, Dehai SONG. Study on the tidal dynamics in Daya Bay, China — Part I. Observation and numerical simulation of tidal dynamic system[J].Journal of Tropical Oceanography, 2017, 36(3): 34-45.

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References 18

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分潮	T1		T2
分潮	振幅 /cm	迟角/º	振幅/cm	迟角/º
O₁	27.62	245.4	27.28	244.1
K₁	33.46	296.4	32.93	294.0
M₂	36.71	257.0	33.58	254.0
S₂	14.79	286.2	13.77	283.7
M₄	13.17	288.5	8.98	280.1
MS₄	10.81	341.7	7.22	333.3
M₆	10.80	107.0	3.83	89.9
2MS₆	10.69	175.2	3.78	159.2

分潮	T1			T2
分潮	振幅/cm	迟角/º	Diff/cm	振幅/cm	迟角/º	Diff/cm
O₁	-0.11	0.10	0.11	0.12	0.30	0.17
K₁	-0.78	0.80	0.93	-0.25	-0.20	0.26
M₂	-0.22	0.20	0.24	0.11	0.20	0.17
S₂	-0.29	-0.70	0.35	0.08	0.60	0.16
M₄	0.09	-0.20	0.10	-0.01	0.40	0.07
MS₄	0.10	-0.50	0.13	-0.02	0.90	0.12
M₆	-0.01	0.40	0.09	-0.02	-0.90	0.06
2MS₆	-0.25	-0.50	0.27	-0.02	-0.10	0.02

Study on the tidal dynamics in Daya Bay, China — Part I. Observation and numerical simulation of tidal dynamic system

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