珠江磨刀门河口潮汐动力变化对人类活动的响应

doi:10.11978/2019137

Abstract

Abstract:

The Modaomen Estuary is the main outlet of the Xijiang River, where large-scale human intervention occurred since the 1980s, including sand excavation in the river network and estuarine regulation project, which inevitably caused the variation of tidal dynamics in the Modaomen Estuary. In this paper, we investigate the variation of tidal dynamics and its response to human intervention in recent 50 years by using statistical analysis and harmonic analysis on hydrological data, and hydrodynamic numerical simulation. The results reveal that the variation of tidal dynamics indicates a natural evolution trend of a river-dominated estuary, characterized by increase in tidal level and decrease in tidal range prior to the 1980s. However, after the 1980s sand excavation in the river network induced a decrease in tidal level and increase in tidal dynamics, while estuarine regulation project resulted in an increase in tidal level and decrease in tidal dynamics. In the inner estuary, tidal dynamics was more affected by sand excavation, with decrease in tidal level and increase in tidal dynamics. In the central estuary, tidal dynamics was affected by both sand excavation and estuarine regulation project, with increase in tidal level and decrease in tidal dynamics during the regulation project (1983-1993) but increase in tidal dynamics after the regulation project (1993-2003). In the outer estuary, tidal dynamics was co-affected by global sea-level rise and estuarine regulation project, with increase in tidal level and decrease in tidal dynamics.

Key words: tidal dynamics, sand excavation, regulation project, Modaomen Estuary

CLC Number:

P731.23

JIANG Chenjuan, ZHOU Jianan, YANG Qingshu. Effects of human intervention on tidal dynamics in the Modaomen Estuary, Pearl River[J].Journal of Tropical Oceanography, 2020, 39(6): 66-76.

Figures/Tables 11

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References 43

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站点	潮汐要素	变化趋势
站点	潮汐要素	1960—1982		1983—1992		1993—2003		1960—2003
竹银	高潮位	增大	显著	减小	不显著	减小	显著	减小	不显著
	低潮位	增大	不显著	减小	不显著	减小	显著	减小	显著
	潮差	增大	不显著	增大	不显著	增大	显著	增大	显著
灯笼山	高潮位	增大	不显著	增大	不显著	增大	不显著	增大	显著
	低潮位	增大	显著	减小	不显著	减小	不显著	增大	显著
	潮差	减小	不显著	增大	不显著	增大	显著	减小	不显著
大横琴	高潮位	-	-	增大	不显著	增大	显著	增大	显著
	低潮位	-	-	增大	显著	增大	不显著	增大	显著
	潮差	-	-	减小	显著	增大	不显著	减小	显著
三灶	高潮位	增大	不显著	增大	不显著	增大	显著	增大	显著
	低潮位	增大	不显著	增大	不显著	增大	不显著	增大	显著
	潮差	减小	不显著	减小	显著	增大	不显著	减小	显著

站位	分潮	1977年	1983年	1987年	1993年	2002年
竹银	O₁	20.7	22.3	24	17.9	22.4
	K₁	28.7	29.8	30.4	26.2	28.2
	M₂	34.2	30.9	30.7	27.8	28.2
	S₂	11.3	13.3	12.8	8.1	10.5
灯笼山	O₁	25.6	25.7	29.1	21.4	26.1
	K₁	34.3	34.6	33.8	30.8	31.7
	M₂	42.3	38.1	38.3	35.1	34.7
	S₂	14	16.9	13	11.2	12.5
大横琴	O₁	26.1	27.2	28.7	23.4	27.9
	K₁	35.1	36.9	37.1	32.4	32.7
	M₂	43.7	42	41.7	38.7	37.3
	S₂	17.8	21.3	19.1	14.4	14.9

河口分段	分潮	1977	1983	1987	1993	2002
灯笼山-竹银 (近口段)	O₁	1.55	1.19	1.21	1.41	1.21
	K₁	1.38	1.09	1.15	1.22	1.22
	M₂	1.02	0.74	0.93	0.87	0.87
	S₂	1.08	0.79	0.74	0.77	0.68
大横琴-灯笼山 (河口段)	O₁	1.93	2.24	1.72	1.01	0.85
	K₁	1.23	1.83	1.66	0.91	0.95
	M₂	0.87	1.31	1.15	0.71	0.69
	S₂	0.57	1.09	0.57	0.56	0.32

Effects of human intervention on tidal dynamics in the Modaomen Estuary, Pearl River

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