Grain Size Characteristics and Sedimentary Dynamics of Sedimentary Column of Mangrove Wetland in Zhanjiang Bay

doi:10.19657/j.geoscience.1000-8527.2020.101

Abstract

Abstract:

Granularity is an important parameter for understanding the sedimentary dynamics characteristics. Mangrove wetland sediments host much sedimentary environment information during the transport and deposition processes. To unravel the vertical grain size characteristics and sedimentary dynamics of mangrove wetland in the Zhanjiang Bay and enhance wetland ecological protection, the grain size parameter characteristics, frequency distribution curve, and sedimentation rate of mangrove wetland sedimentary columns at the Nanhaidi (NHD), Dongtoushan Island (DTSD), Huguang Town (HGZ)and Guanhaichanglang (GHCL)stations were analyzed. Our work reveals the sedimentary evolution of the Zhanjiang Bay in the past century, and our results suggest that: (1)The ²¹⁰Pb_ex specific activity of NHD and DTSD columns both show a good exponential decay trend, with the deposition rate increasing with time. The average deposition rates of NHD and DTSD were 1.277 cm/a and 1.034 cm/a, respectively, but that of DTSD far exceeded that of NHD after 2011. (2)Grain-size characteristics of individual sedimentary column is markedly different, and the average grain size of NHD sedimentary column is 3.42ϕ, mainly composed of sand (67.23%)and is classified as silty sand. The mean diameter of DTSD is 5.71ϕ with sorting coefficient of 2.21. It is mainly composed of silty-sand (55.13%)and is classified as sandy-silt. HGZ is sandy-silt with mean particle size of 5.49ϕ. The GHCL is mainly composed of sand (55.85%)with average particle size of 4.18ϕ. (3)The grain size frequency distribution curves display multimodal features, implying that the deposition process was doped with the process of various sedimentary media. The NHD and GHCL particle sizes are clustered toward the sandy particle end-member, indicating strong sedimentary dynamics, whereas the sedimentary dynamics of DTSD and HGZ is considerably weaker. (4)The grain-size characteristics are influenced by the local terrestrial source, island and runoff, whilst the sedimentation process is significantly influenced by the tidal current dynamics, mangrove distribution, and human activities. In recent years, the rising sedimentation rate in the Zhanjiang Bay may have an impact on the navigation channel, and more attention should be paid to the wetland ecological environment in the bay.

Key words: Zhanjiang Bay, grain size characteristic, deposition rate, sedimentary dynamics

CLC Number:

LUO Songying, QUAN Xiaowen, CHEN Bishan, QIU Jinkun, LIANG Jiaxin, DENG Ziyi. Grain Size Characteristics and Sedimentary Dynamics of Sedimentary Column of Mangrove Wetland in Zhanjiang Bay[J]. Geoscience, 2021, 35(03): 647-656.

Figures/Tables 6

Table 1 Sampling record of Zhanjiang Bay

	编号	纬度(N)	经度(E)	岩心长度/cm
南海堤	NHD	21°09'12″	110°29'22″	100
东头山岛	DTSD	21°06'13″	110°23'30″	100
湖光镇	HGZ	21°06'34″	110°18'45″	100
观海长廊	GHCL	21°12'14″	110°24'52″	100

Fig.1 Location map, field and core photos of the study area

Fig.2 Longitudinal profiles of 210Pbex specific activity and 210Pb deposition rate

Fig.3 Vertical distribution of particle size parameters and sedimentary column components (a)NHD;(b)DTSD;(c)HGZ;(d)GHCL

Fig.4 Grain size distribution frequency curves of sedimentary columns in the Zhanjiang Bay

Fig.5 Schematic diagram of the sedimentary dynamic evolution model (a)NHD;(b)DTSD

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