| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
MENG Lingpeng, HU Rijun, LI Yi, YUAN Xiaodong, ZHU Longhai, GUO Junjie. Transport characteristics of suspended sediment in Funing Bay during spring tide in winter[J]. Marine Geology & Quaternary Geology, 2020, 40(3): 61-73. doi: 10.16562/j.cnki.0256-1492.2019111801
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Transport characteristics of suspended sediment in Funing Bay during spring tide in winter
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Abstract
Based on the simultaneous field observations at the eight stations near the area of Funing Bay in December of 2014, the variation in suspended sediment distribution pattern and transport flux during the winter spring tide was analyzed. Combined with the calculation results of the Richardson number, the water mixed potential energy, as well as the change rate of water potential energy caused by tidal power, the effects of vertical mixing of water bodies on the distribution of suspended sediment were also discussed, and the transport mechanism of suspended sediments was studied. The results show that the temperature and salinity increase from inside to outside of the bay, and the suspended sediment share the same trend. The concentration of suspended sediment is obviously asymmetrical during a tide cycle, that is, the concentration of suspended sediment is high during the flood tide inside and at the mouth of the bay except the No.1 station, while the concentration is high during the ebb tide outside the bay except the No. 4 station. From inside to outside of the bay, with the increase in water depth, the vertical mixing of water body gradually weakens, and the vertical difference of suspended sediment concentration gradually increases. The transport of suspended sediment is generally transited to the land inside and at the mouth of the bay, while the transport of suspended sediment is transited to the sea outside the bay. The vertical stratified transport direction is mostly landward with a higher value inside and at the mouth of the bay, while the suspended sediment transport direction is different in the vertical direction outside the bay. The tidal pump transport due to the asymmetry of tidal current and the hysteresis effect of suspended sediment plays a major role in the total suspended sediment transport.
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Keywords:
- suspended sediment /
- lamination and mixing /
- transport mechanism /
- Funing Bay
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References
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MENG Lingpeng, HU Rijun, LI Yi, YUAN Xiaodong, ZHU Longhai, GUO Junjie. Transport characteristics of suspended sediment in Funing Bay during spring tide in winter[J]. Marine Geology & Quaternary Geology, 2020, 40(3): 61-73. doi: 10.16562/j.cnki.0256-1492.2019111801
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Figure 1.
Location of Survey stations in the offshore area of Funing Bay
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Figure 2.
The curve of turbidity and sediment concentration was measured at No. 3 station in winter
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Figure 3.
Temperature （℃） and salinity （PSU） time series of each station
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Figure 4.
Vertical average current vector of each station
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Figure 5.
Horizontal distribution of vertical mean suspended sediment concentration at each station
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Figure 6.
Time series diagram of flow rate （cm/s） and suspended sediment concentration （mg/L）
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Figure 7.
Vertical stratified suspended sediment transport capacity of each station
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Figure 8.
Time series of gradient Richardson Numbers for each station
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Figure 9.
Time series diagram of the potential energy required for water body mixing at each station （solid line） and the potential energy change rate （dotted line） caused by tidal turbulence
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Figure 10.
Residual vector diagram of surface layer, 0.6h and bottom layer of each station