人类活动影响下的钦州湾近期滩槽冲淤演变特征

doi:10.11978/2019013

Abstract

Abstract:

Based on the underwater topographical data and remote sensing data from the 1980s, we analyze the characteristics of shoal-trough pattern change and erosion-siltation evolution in Qinzhou Bay under the influence of recent high intensity human activities. We also discuss the reasons from the aspect of dynamic geomorphology combining the methods of remote sensing, GIS, and numerical simulation. The results indicate that the Maowei Sea showed overall deposition, the siltation intensity of the shallow water area above the 2m isobath was significantly greater than that in the other areas, and the channel was characterized by erosion due to artificial sand mining and enhancement of tidal current. The outer bay was dominated by deposition, but its deposition rate was less than that of the inner bay. The scouring and silting characteristics of the shoal and trough were significantly different. The west channel, middle channel, and the side foreland were dominated by deposition, while Middle Shoal, East Channel were characterized by scour. Due to high intensity human activities, the flood and ebb tidal capacity of the Maowei Sea reduced 4.6% and 4%, respectively, which caused continuous deposit. The coastline in the middle of the outer bay has been pushed toward the sea significantly, which made the tidal current concentrated and increased velocity by 0.1~0.2 m·s ^-1, leading to the erosion of the Middle Shoal. The deepening of the East Channel made flow in the Middle Channel move to the East Channel, which made the Middle Channel shrink. The changes of the horizontal Kelvin number indicate that human activities have greater impact on the East and Middle channels of the outer bay. The stability of the East Channel is enhanced and the Middle Channel continues to shrink, while the stability of the West Channel remains basically unchanged.

Key words: Qinzhou Bay, human activities, dynamic geomorphology, evolution characteristics.

YANG Liuzhu, YANG Liling, PAN Hongzhou, LIU Chaoqun, YU Fenghua. Characteristics of recent evolution in Qinzhou Bay influenced by human activities[J].Journal of Tropical Oceanography, 2019, 38(6): 41-50.

Figures/Tables 15

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References 21

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高程/m	2009—2016茅尾海冲淤特征			高程/m	2004—2014外湾冲淤特征
高程/m	冲淤量/(×10⁴m³)	冲淤厚度/m	冲淤速率/(m·a^-1)	高程/m	冲淤量/(×10⁴m³)	冲淤厚度/m	冲淤速率/(m·a^-1)
>0	1061.14	0.44	0.06	-4~0	2741.52	0.32	0.03
-2~0	1514.04	0.27	0.04	-7~-4	80.63	0.02	0.00
-4~-2	228.27	0.16	0.02	-7~-12	-748.99	-0.30	-0.03
-4~2	2803.44	0.29	0.04	-12~0	2073.16	0.13	0.01

观测断面	涨潮量/m³		变化率/%	落潮量/m³		变化率/%
观测断面	开发前	变化值	变化率/%	开发前	变化值	变化率/%
MWH1	123509	-11149.2	-9.03%	99029.8	-3548.03	-3.58%
MWH2	553833	-15502.6	-2.80%	307062.7	-17837.2	-5.81%
MWH3	1002491	-19487.41	-1.94%	664348.3	-18084.2	-2.72%

	U/(m·s^-1)		B/m		H/m		K_eh
	工程前	工程后	工程前	工程后	工程前	工程后	工程前	工程后
西航道(dm1)	1.20	1.15	1294.99	1252.38	9.27	9.28	0.20	0.19
西航道(dm2)	1.09	0.98	1063.20	1086.81	9.43	9.18	0.15	0.14
中水道(dm1)	1.27	1.02	636.87	1477.59	7.45	6.9	0.13	0.26
中水道(dm2)	1.18	1.16	1018.49	3235.52	7.11	6.58	0.20	0.68
东航道(dm1)	1.22	1.07	1197.43	894.67	11.14	13.45	0.16	0.08
东航道(dm2)	1.06	0.97	1279.07	627.88	9.52	15.15	0.17	0.05

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Characteristics of recent evolution in Qinzhou Bay influenced by human activities

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