Spatio-temporal variation and influencing factors of seafloor sediment grain size off the mouth of Dingzi Bay of Southern Shandong Peninsula

WANG Wei; TANG Shikai; HU Yanping; WANG Hongyan; SHI Hongyuan; ZHAN Chao

doi:10.16562/j.cnki.0256-1492.2021050601

2022 Vol. 42, No. 2

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Article navigation > Marine Geology & Quaternary Geology > 2022 > 42(2): 70-80

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WANG Wei, TANG Shikai, HU Yanping, WANG Hongyan, SHI Hongyuan, ZHAN Chao. Spatio-temporal variation and influencing factors of seafloor sediment grain size off the mouth of Dingzi Bay of Southern Shandong Peninsula[J]. Marine Geology & Quaternary Geology, 2022, 42(2): 70-80. doi: 10.16562/j.cnki.0256-1492.2021050601

Citation:

WANG Wei, TANG Shikai, HU Yanping, WANG Hongyan, SHI Hongyuan, ZHAN Chao. Spatio-temporal variation and influencing factors of seafloor sediment grain size off the mouth of Dingzi Bay of Southern Shandong Peninsula[J]. Marine Geology & Quaternary Geology, 2022, 42(2): 70-80. doi: 10.16562/j.cnki.0256-1492.2021050601

Spatio-temporal variation and influencing factors of seafloor sediment grain size off the mouth of Dingzi Bay of Southern Shandong Peninsula

1.
Marine Geological Exploration Institute of Shandong Province, Yantai 264004, China
2.
No.3 Exploration Institute of Geology and Mineral Resources of Shandong Province, Yantai 264004, China
3.
Coast Institute of Ludong University, Yantai 264025, China

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Corresponding author: ZHAN Chao, zhanchao0226@163.com

Received Date: 06 May 2021

Revised Date: 07 September 2021

Publish Date: 28 April 2022

Abstract

Abstract

11 columnar sediment samples are collected off the mouth of Dingzi Bay for grain size analysis and ²¹⁰Pb radioactivity measurement. With the results, the sediments are classified and grain size parameters and sedimentation rate calculated. Combined with the geomorphologic evolution of Dingzi Bay and the change in human activities in the Wulong River Basin, the influence of human activities on the evolution of sediment grain size in the coastal section out the Wulong River estuary is discussed. The results suggested that the columnar sediments may be divided into seven types, and the mean grain size (Φ) in the horizontal direction shows a trend of increase from the deltaic center to all directions as well as an irregular pattern in vertical direction. The sediment sorting changes from good to medium, with a near-symmetric-positive skewness and sharp kurtosis. Sediment types and their diagnostic parameters may be used as tools to reveal depositional environments. Sand, gravelly and silty sand and their small Φ-values suggest relatively strong hydrodynamic environments, while sandy silt, silt, clay and mud and their large Φ-values indicate relatively weak hydrodynamic environments. The average sedimentation rate at the top and front of the delta was 0.51 cm·a⁻¹ and 1.19 cm·a⁻¹, respectively. Human activities in beach reclamation and others increased since 1980, which have caused the decrease in tidal space, sediment discharge and velocity into the sea. As the results, the overall trend of sediment particles in the human-influenced area becomes finer.
- ebb tide delta /
- grain size parameters /
- sedimentation rate /
- human activity /
- Dingzi Bay /
- southern Shandong Peninsula

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References

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