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Distribution pattern of flocsand and its controlling factors in a saltwater-wedge estuary: A case study of the Modaomen Estuary of the Pearl (Zhujiang) River
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Kaiyun Zhang1, Hongyue Liang1, Pu Wang1, Haiwei Li1, Wen Wei1, Huayang Cai1, Feng Liu1, 2, *, Lei Zhu3
Haiyang Xuebao | 2024, 46(6) : 84 - 97
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Haiyang Xuebao | 2024, 46(6): 84-97
• Article •
Distribution pattern of flocsand and its controlling factors in a saltwater-wedge estuary: A case study of the Modaomen Estuary of the Pearl (Zhujiang) River
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Kaiyun Zhang1, Hongyue Liang1, Pu Wang1, Haiwei Li1, Wen Wei1, Huayang Cai1, Feng Liu1, 2, *, Lei Zhu3
Affiliations
  • 1. Institute of Estuarine and Coastal Research, School of Ocean Engineering and Technology, Sun Yat-Sen University, Guangzhou 510275, China
  • 2. Key Laboratory of Coastal Science and Integrated Management, Ministry of Natural Resources, Qingdao 266061, China
  • 3. School of Marine Science, Sun Yat-Sen University, Guangzhou 510275, China
Published: 2024-06-30 doi: 10.12284/hyxb2024067
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Flocculation of fine sediments is a key process affecting sediment transport and dispersion in estuaries, which is controlled by complex dynamic structure of estuaries, and spatial distribution of flocs in a stratification condition needs to be explored. To solve this problem, in this study, based on the hydrology and sediment cruising observation in the Modaomen Estuary of the Pearl River during the dry season in 2020, spatial and temporal distribution of flocs in the Modaomen Estuary was analyzed, impacts of dynamics factors were investigated, and distribution pattern of flocs in a stratification condition was uncovered. The results show that median floc size in the Modaomen Estuary during the observation period ranged from 1.87 μm to 395.53 μm, and volumetric concentration of flocs ranged from 20.29 μL/L to 1495.67 μL/L. Vertically, median floc size in the middle and surface layers was generally larger than that in the bottom layer. The plane distribution characteristic of the median floc size is that the maximum values generally occurred at the central bar and the west side. Decomposition of multimodal floc size distributions indicates that the flocs in the Modaomen Estuary were composed of primary particles (Pp) and Flocculi (collectively known as Pico-flocs), microflocs (Micro), macroflocs (Macro), among which Macro was dominant. In view of vertical distribution, the volumetric concentration of Pico-flocs and Micro in the bottom layer tended to be larger than that in the surface and middle layers, while volumetric concentration of Macro in the surface and middle layers was generally larger than that in the bottom layer, which is closely related to dynamic structure in the salt water wedge estuary. Strong salinity stratification inhibited the exchange of flocs between different water layers, resulting in a relatively higher percentage of Macro in the surface layer than that in the middle and bottom layers. In the bottom layer flocs were affected by intensity of turbulent shear and deflocculation process was dominant. As a result, the percentage of Pico-flocs and Micro was higher than the surface and middle layers. This study is not only helpful to elucidate the flocculation mechanism of fine sediment under complex dynamics, but also provides technical support for regulation of mouth bar, goverment of water and sediment, and channel dredging in the Modaomen Estuary.

the Modaomen Estuary  /  decomposition of particle size  /  spatial variation  /  salinity stratification  /  turbulence
Kaiyun Zhang, Hongyue Liang, Pu Wang, Haiwei Li, Wen Wei, Huayang Cai, Feng Liu, Lei Zhu. Distribution pattern of flocsand and its controlling factors in a saltwater-wedge estuary: A case study of the Modaomen Estuary of the Pearl (Zhujiang) River[J]. Haiyang Xuebao, 2024 , 46 (6) : 84 -97 . DOI: 10.12284/hyxb2024067
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Article Info
doi: 10.12284/hyxb2024067
  • Receive Date：2024-02-09
  • Online Date：2025-11-26
  • Published：2024-06-30
Article Data
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History
  • Received：2024-02-09
  • Revised：2024-05-24
Funding
Affiliations
    1. Institute of Estuarine and Coastal Research, School of Ocean Engineering and Technology, Sun Yat-Sen University, Guangzhou 510275, China
    2. Key Laboratory of Coastal Science and Integrated Management, Ministry of Natural Resources, Qingdao 266061, China
    3. School of Marine Science, Sun Yat-Sen University, Guangzhou 510275, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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