The effects of spring-neap tide on sediment bedding on tidal flats: A numerical study

Xu Mengpiao; Dong Peihua; Ma Jun; Luo Feng; Zhang Changkuan; Fan Daidu; Zhou Zeng

doi:10.12284/hyxb2021125

Volume 43 Issue 10

Oct. 2021

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Xu Mengpiao，Dong Peihua，Ma Jun, et al. The effects of spring-neap tide on sediment bedding on tidal flats: A numerical study[J]. Haiyang Xuebao，2021, 43(10)：70–80 doi: 10.12284/hyxb2021125

Citation:

Xu Mengpiao，Dong Peihua，Ma Jun, et al. The effects of spring-neap tide on sediment bedding on tidal flats: A numerical study[J]. Haiyang Xuebao，2021, 43(10)：70–80 doi: 10.12284/hyxb2021125

Citation:

Xu Mengpiao，Dong Peihua，Ma Jun, et al. The effects of spring-neap tide on sediment bedding on tidal flats: A numerical study[J]. Haiyang Xuebao，2021, 43(10)：70–80 doi: 10.12284/hyxb2021125

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The effects of spring-neap tide on sediment bedding on tidal flats: A numerical study

doi: 10.12284/hyxb2021125

Xu Mengpiao^{1, 2
,},
Dong Peihua²,
Ma Jun³,
Luo Feng¹,
Zhang Changkuan¹,
Fan Daidu⁴,
Zhou Zeng^{1, 4, 5
,
,}

1.
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
2.
China Design Group, Nanjing 210014, China
3.
Channel Management Office of Hangzhou Port and Waterway Administration, Hangzhou 310016, China
4.
School of Ocean and Earth Sciences, Tongji University, Shanghai 200092, China
5.
Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security, Hohai University, Nanjing 210098, China

Funds: The study is financially supported by State Key Laboratory of Marine Geology, Tongji University (No. MG201901) and Jiangsu Marine Science and Technology Innovation Programme (No. HY2018-1)

Received Date: 2020-04-08
Rev Recd Date: 2020-06-30

Available Online: 2021-06-16

Publish Date: 2021-10-30

Abstract

Abstract

The formation of vertical sedimentary rhythmic layers of tidal flat mainly depends on periodic tidal conditions, including flood and ebb tide, spring and neap tide, seasonal and longer term scale tidal characteristics. In order to investigate the distribution and mechanism of sediment bedding on tidal flats, a one-dimensional numerical model was used to simulate the rhythmic layers of long-term tidal flat bedding layers under spring and neap tidal cycles. Results indicate that the periodicity of spring-neap tide is the main reason for the rhythmicity of sedimentary bedding. One couplet in the rhythm layer corresponds to the spring-neap tidal period, which is formed by the mud-dominated layer during the neap tide and the sand-dominated layer during the spring tide. The thicknesses of layers also show a cyclical change: bedding layers are thicker during the spring tide and thinner during the neap tide. The boundary sediment concentration is also an important factor affecting the structure of tidal couplets. An increasing boundary concentration of silt makes the tidal rhythm layer coarser and increases the overall thickness of the sand-dominated layer. When the boundary sediment concentration significantly increases, the vertical tidal rhythm layers on the tidal flat are more intact with an evident increase in layer thickness. The formation and characteristics of tidal bedding layers are the result of the joint action of many factors (e.g., waves, storms, biological factors and etc.), which await further research effort in the future.
- tidal flat,
- sediment sorting,
- tidal rhythm layers,
- numerical simulation

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References(17)

References

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