潮优型河口动力对水深变化的响应机制研究——以葡萄牙Guadiana河口为例*

doi:10.11978/2019037

Abstract

Abstract:

Quantifying the impacts of human-induced (such as dredging for navigational channels) or natural (such as global sea level rise) interventions on estuarine environment is an important issue for estuary and coastal studies. For given simplified geometry and dynamics, analytical models are capable of rapidly identify the influence of human-induced or natural interventions on estuarine environment, which are invaluable tools for exploring response of tidal dynamics to external forcing. In this study, a one-dimensional hydrodynamic analytical model was used to explore the response of tidal dynamics in terms of different constituents to variation of tidally averaged water depth (mimicking the channel dredging and deposition) in the Guadiana estuary in Portugal, building on previous studies on nonlinear frictional interaction between different tidal constituents. The results show that the influence of variable depth on tidal dynamics in the seaward reach (x=0-60 km) is stronger compared to that in the landward reach (x=60-78 km). In particular, the influence of variable depth on the predominant semi-diurnal tides (M₂, S₂, N₂) is larger than that on diurnal tides (K₁, O₁). Analytical results also indicate that the basic tidal dynamic pattern along the estuary is more or less the same for a less intensive dredging of less than 2 m, while the pattern may substantially change for an intensive dredging activity. In addition, the channel bed deposition will weaken the tidal dynamics with a decrease of tidal amplitude, velocity amplitude, tidal wave celerity, and the phase lag between velocity and the elevation also decreases.

Key words: tidal dynamics, channel dredging, channel deposition, analytical model, Guadiana estuary

CLC Number:

P731

ZHANG Ping, XIE Meifang, YANG Hao, CAI Huayang, Ou Suying, YANG Qingshu. Response of tidal dynamics to the variation of water depth: case study of Guadiana estuary in Portugal[J].Journal of Tropical Oceanography, 2020, 39(1): 1-11.

Figures/Tables 8

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References 39

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		半日分潮			全日分潮
		M₂	N₂	S₂	K₁	O₁
流速参数(μ)	ψ₁/σ₁	-0.14/-35.89	-0.13/-39.92	-0.12/-39.07	-0.04/-21.07	-0.03/-18.30
	ψ₂/σ₂	0.04/10.74	0.06/17.90	0.05/16.36	0.002/0.78	-0.001/-0.36
	ψ₃/σ₃	0.06/14.76	0.10/30.82	0.08/27.34	-0.003/-1.75	-0.007/-3.49
	ψ₄/σ₄	0.02/4.99	0.10/31.15	0.08/25.88	-0.02/-12.55	-0.03/-14.48
潮波振幅衰减率参数(δ)	ψ₁/σ₁	-0.37/-15.95^*	-0.40/-3.01^*	-0.41/-2.91^*	-0.49/-4.87^*	-0.48/-5.16^*
	ψ₂/σ₂	0.13/5.66^*	0.17/1.259^*	0.17/0.18^*	0.12/-1.22^*	0.12/-1.23^*
	ψ₃/σ₃	0.22/9.46^*	0.30/2.27^*	0.29/2.10^*	0.19/1.93^*	0.18/1.92^*
	ψ₄/σ₄	0.29/12.36^*	0.44/3.32^*	0.43/3.04^*	0.25/2.47^*	0.23/2.45^*
波速参数(λ)	ψ₁/σ₁	0.28/28.96	0.28/24.86	0.30/25.90	0.56/46.13	0.60/48.86
	ψ₂/σ₂	-0.17/-16.81	-0.16/-14.14	-0.17/-14.67	-0.26/-21.12	-0.26/-21.57
	ψ₃/σ₃	-0.34/-34.19	-0.34/-30.07	-0.35/-30.87	-0.48/-39.70	-0.49/-40.23
	Ψ₄/σ₄	-0.67/-68.13	-0.732/-65.03	-0.75/-65.48	-0.87/-71.11	-0.87/-71.41
水位与流速之间的相位差(?)	ψ₁/σ₁	-9.50/-12.85	-11.84/-15.08	-12.45/-15.04	-1.50/-1.67	-1.07/-1.19
	ψ₂/σ₂	4.27/5.76	4.32/5.50	3.28/3.97	0.16/0.18	0.12/0.13
	ψ₃/σ₃	7.79/10.53	7.15/9.10	4.99/6.03	0.24/0.27	0.42/0.19
	ψ₄/σ₄	12.86/17.39	10.04/12.78	6.51/7.86	0.32/0.35	0.23/0.26

Response of tidal dynamics to the variation of water depth: case study of Guadiana estuary in Portugal

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References 39

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