Spatial distribution and its controlling mechanism of surface sediments in the Yazhou Bay, Hainan Island

Qu Hongbao; Gou Pengfei; Sun Longfei; Liu Gang; Han Xiaohui; Long Genyuan

doi:10.12284/hyxb2021171

Volume 43 Issue 12

Dec. 2021

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Qu Hongbao，Gou Pengfei，Sun Longfei, et al. Spatial distribution and its controlling mechanism of surface sediments in the Yazhou Bay, Hainan Island[J]. Haiyang Xuebao，2021, 43(12)：70–81 doi: 10.12284/hyxb2021171

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Spatial distribution and its controlling mechanism of surface sediments in the Yazhou Bay, Hainan Island

doi: 10.12284/hyxb2021171

Qu Hongbao^{1, 2
,},
Gou Pengfei^{1, 2
,
,},
Sun Longfei^{1, 2},
Liu Gang^{1, 2},
Han Xiaohui^{1, 2},
Long Genyuan^{1, 2}

1.
Key Laboratory of Marine Geology Resources and Environment of Hainan Province, Haikou 570206, China
2.
Marine Geological Survey Institute of Hainan Province, Haikou 570206, China

Received Date: 2020-10-10
Rev Recd Date: 2020-11-13

Available Online: 2021-05-12

Publish Date: 2021-12-30

Abstract

Abstract

Based on the 141 surface sediments collected from the Yazhou Bay, Hainan Island, the distribution characteristics of grain size components, grain size parameters and sediment types were analyzed. The results indicate that the samples can be classified into 6 types as argillaceous arenaceous gravel, gravelly argillaceous sand, sand, silty sand, arenaceous silt and silt in the study area. In particular, the arenaceous silt is most widely distributed. The grain size diameters increase and then decrease, showing a banding distribution from north to south. The separation coefficient is generally high, which indicates the complex sediment sources and hydrodynamic conditions in this area. Base on Flemming ternary diagram, combined with sediment sources, hydrodynamic conditions and topographic features, the study area is divided into three sedimentary districts from north to south: the nearshore zone which showing the characteristics of wave-controlled deposition is mostly impacted by wave winnowing and transport, and the grain size is relatively small; the central Yazhou Bay zone is a high-energy coarse grained sand area, mainly controlled by the combined action of runoff, wave and tidal current; relatively, the southern zone is mainly affected by tidal current load, where the wave action is weakened, the sediment is the finest and deposited in a lower energy environment. In addition, the analysis of sediment transport trend shows that the midwest part of the study area is a depositional center, the silt of coastal erosion, Ningyuan River and offshore tidal current transport are carried to this area.
- Yazhou Bay,
- surface sediments,
- grain-size characteristics,
- sedimentary environment,
- controlling mechanism

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References

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