| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
ZENG Weizhu, ZHENG Zhaoyong, HUANG Zhixiong, HUANG Long. Grain-size endmember and transport trends of surface sediment near the Hong Kong-Zhuhai -Macao Bridge[J]. Marine Geology & Quaternary Geology, 2025, 45(3): 40-49. doi: 10.16562/j.cnki.0256-1492.2024041002
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Grain-size endmember and transport trends of surface sediment near the Hong Kong-Zhuhai -Macao Bridge
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Abstract
Grain size analysis was conducted on 57 surface sediment samples collected in the waters of the Hong Kong-Zhuhai-Macao Bridge in May 2021. The sources and controlling factors of each end-member composition were discussed by combining grain size end-member analysis and grain size trend analysis techniques. Results show that the average particle size of the surface sediments was 1.95～7.45Φ, mainly muddy silt and sandy silt types, and could be divided into three particle size end-members: muddy end-member (M1), fine silt end-member (M2), and coarse silt or fine sand end-member (M3). M2 and M3 were mainly distributed in the northwest of the bridge, and M1 showed a trend of migrating to the southwest. M3 was mainly distributed in the southeast of the bridge, showing a trend of migrating to the northwest. The distribution and migration trends of M1 and M2 are mostly consistent with those of suspended matter, being mainly affected by runoff sediment input. M3 is mainly distributed in low suspended-matter concentration area and was greatly affected by tidal dynamics. The surface sediments before and after the construction of the bridge showed an obvious coarsening trend, which may be mainly related to the reduction of runoff sediment input and the enhancement of tidal dynamics in the Lingding Yang (Bay) in recent years.
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References
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ZENG Weizhu, ZHENG Zhaoyong, HUANG Zhixiong, HUANG Long. Grain-size endmember and transport trends of surface sediment near the Hong Kong-Zhuhai -Macao Bridge[J]. Marine Geology & Quaternary Geology, 2025, 45(3): 40-49. doi: 10.16562/j.cnki.0256-1492.2024041002
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Figure 1.
The topographiy of LDB and surface sediment sampling stations
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Figure 2.
Clay-silt-sand endmember ternary discrimination of surface sediments in the study area
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Figure 3.
Distributions of grain size parameters and types of surface sediments in the study area
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Figure 4.
Gran-size endmember modeling results of typical surface sediments
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Figure 5.
Distribution patterns of endmembers and its grain-size trend of the surface sediments
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Figure 6.
Suspended sediment distribution in the areas of the bridge on October 2, 2019
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Figure 7.
Velocity vector of tidal current in the Lingding Yang (Bay) and the bridge areas on July 16-17, 2019
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Figure 8.
Correlation between average grain-size and sorting coefficient of the surface sediments
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Figure 9.
Grain size change of the surface sediment before and after the bridge construction
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Figure 10.
Correlation between water depth and grain size of surface sediment in the bridge region