桐花树红树林潮滩近底层悬沙浓度垂向剖面变化特征分析*

doi:10.11978/2021167

Abstract

Abstract:

Suspended sediment concentration(SSC)observation in vertical profile near the bed of mangrove tidal flat under the waves and tidal currents, is important to understand the mechanisms of energy dissipation and deposition promotion by vegetations, and the ecological restoration in coastal zone. In this study, we measured the hydrological data using HR, ADV, Twave and ASM and the typical plants’ parameters of Aegiceras corniculatum for 3 consecutive days of flood tides in the summer of 2019. Then the process of the near-bed vertical SSC of mangrove tidal flat was analyzed in response to waves, tidal currents and spatial structure of Aegiceras corniculatum. The results showed that: (1) the variations of suspended sediment flux and SSC near bed in Aegiceras corniculatum tidal flat had the characteristic of tidal asymmetry, the SSC of flood tide was significantly greater than that of ebb tide. The vertical high SSC area of the profile changed from 0.1~0.37 m to 0.5-0.67 m from the bottom in the early flood tide to flood maximum, and from the upper to the bottom in ebb maximum to end. (2) In the intra-tide, the suspension and resuspension stages occurred at the early flood and latest ebb that were dominated by waves. The advection and deposition stages occurred at the whole period from flood maximum to ebb maximum dominated by tidal currents. (3) Dense branches and leaves in the canopy of Aegiceras corniculatum intercepted more than 40% of the suspended sediment in the upper canopy during flood tide. The SSC decreased by more than 71% when the flow during ebb tide. This dynamical deposition mechanism of asymmetrical flood and ebb tide was conducive to sediment transportation landward which then led to flat expansion.

Key words: spatial structures of Aegiceras corniculatum, profile near bed, suspended sediment concentration, wave-current interaction

CLC Number:

P737.14

HUANG Zuming, ZHOU Xiaoyan, DAI Zhijun, CHE Zhiwei. Analysis of the variations of suspended sediment concentration in vertical profile near the bed of Aegiceras corniculatum tidal flat[J].Journal of Tropical Oceanography, 2022, 41(4): 38-50.

Figures/Tables 13

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潮周期		悬沙通量/(kg·m^-3)
潮周期		z=0.6m	z=0.5m	z=0.4m	z=0.3m	z=0.2m
T1	涨潮	3.013	1.737	0.839	1.721	1.154
T1	落潮	-0.893	-0.130	-0.002	-0.219	-0.303
T2	涨潮	2.382	2.126	1.686	1.672	1.124
T2	落潮	-0.676	-0.528	-0.374	-0.278	-0.176
T3	涨潮	2.321	2.016	2.231	1.669	1.049
T3	落潮	-0.898	-0.807	-0.714	-0.383	-0.219

植株参数	典型中株	典型小株
数目/棵	26	8
高度/cm	66	17
冠层长度/cm	85	15
冠层宽度/cm	45	11
D_z_=0.1/cm	1.6	0.5
D_z_=0.3/cm	0.8
D_z_=0.5/cm	0.4
树枝总数目/条	72	24
树叶总数目/片	210	75

Analysis of the variations of suspended sediment concentration in vertical profile near the bed of Aegiceras corniculatum tidal flat

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