Characteristics of Sediment Grain Size and Their Implications for Bottom Hydrodynamic Environment in the Pearl River Estuary

PENG Xiao-tong; ZHOU Huai-yang; YE Ying; CHEN Guang-qian

Analysis of sediment grain size showed that the grain size grade changed greatly in the Pearl estuary. Frequency distribution curves indicated the different sources of the suspended matters in the Pearl River estuary. In spatial distribution, content of coarser sediment component decreased quickly from north and northwest to southeast. However, finer sediment component always had higher contents in the middle of the estuary where a turbidity maximum zone existed, which was related to the resuspension and flocculation in this zone. Mean grain sizes and coarser components of sediments were successfully used to inverse the direction and velocity of bottom currents before the accumulation of sediments. The grade direction of mean grain sizes was basically coincident to the transport direction of the suspended matter. The predominant velocity of bottom current in various zone were consistent with data obtained on-the-spot survey.

1. Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640;

2. Department of Earth Science, Zhejiang University, Hangzhou 310027

Received Date: 2003-06-25

Rev Recd Date: 2003-09-12

Publish Date: 2004-09-10

Key words:

Abstract: Analysis of sediment grain size showed that the grain size grade changed greatly in the Pearl estuary. Frequency distribution curves indicated the different sources of the suspended matters in the Pearl River estuary. In spatial distribution, content of coarser sediment component decreased quickly from north and northwest to southeast. However, finer sediment component always had higher contents in the middle of the estuary where a turbidity maximum zone existed, which was related to the resuspension and flocculation in this zone. Mean grain sizes and coarser components of sediments were successfully used to inverse the direction and velocity of bottom currents before the accumulation of sediments. The grade direction of mean grain sizes was basically coincident to the transport direction of the suspended matter. The predominant velocity of bottom current in various zone were consistent with data obtained on-the-spot survey.

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Reference (12)

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Characteristics of Sediment Grain Size and Their Implications for Bottom Hydrodynamic Environment in the Pearl River Estuary

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