Fluid Mud Measurement and Siltation Analysis in A Trial Excavated Channel in the Approach Channel of the Xiangshan Port

Abstract

In order to clarify the distribution and variation of silt and fluid mud in the Waiganmen shallow section of the 50000-ton intake channel of the Xiangshan Port, and to understand the influence of the channel excavation on the surrounding flow conditions and the strength of the backsilting, especially the impact of typhoon on the sudden silting of the channel, so as to demonstrate the feasibility and stability of the channel excavation. The fluid mud, hydraulic, sediment and topographic measurements were carried out in the study area, and the thickness of the fluid mud layers, tidal current, sediment and topographic data were obtained. Dual-frequency sounder, gamma-ray densitometer and SILAS navigational fluid mud measurement system were used to monitor the fluid mud, and the results were compared and verified. The adaptability and accuracy of the three methods were analyzed. The SILAS navigational continuous density measurement system and gamma-ray fixed-point fluid mud measurement are used to detect the density, thickness and variation of the fluid mud accurately. Based on the hydrological observation data, the process of erosion and deposition in excavation channel and its influence mechanism are analyzed, and the distribution characteristics and evolution law of siltation in engineering area are given in the form of empirical formula. The research shows that the super typhoon can produce large siltation, which results in sudden siltation of the channel. The tidal current is the main dynamic factor of the change of erosion and siltation of the excavation trench. Under the influence of reciprocating tidal current and excavation topography, the trial excavation trench is silted on the whole. There is fluid mud in the monitoring area of the trench, and the distribution of fluid mud is different in space. The thickness of the fluid mud at the bottom of the trench is generally larger than that outside the trench and the slope of the trench, and the siltation of the trench tends to be slow. The research results can provide scientific evaluation for channel excavation and maintenance, and support for the implementation of the project.

This is a preview of subscription content, log in to check access.

References

  1. Guo, H.F., 2010. Application of SILAS system to bottom sediment measurement in the Taihu Lake, Zhejiang Hydrotechnics, (5), 48–51, 60. (in Chinese)

    Google Scholar 

  2. Han, S.L., Liang, S.X. and Sun, Z.C., 2014. Numerical simulation of tides, tidal currents and temperature-salinity structures in Xiangshan Bay based on FVCOM, Journal of Waterway and Harbor, 35(5), 481–4188. (in Chinese)

    Google Scholar 

  3. Hoitink, A.J.F. and Hoekstra, P., 2005. Observations of suspended sediment from ADCP and OBS measurements in a mud-dominated environment, Coastal Engineering, 52(2), 103–118.

    Article  Google Scholar 

  4. Ling, H.L., Sun, Y.Q. and Yang, T., 1997. Measurements of acoustic parameters of fluid-mud in Changjiang Estuary and Hangzhou Gulf, Technical Acoustics, 15(4), 194–197. (in Chinese)

    Google Scholar 

  5. Liu, H., He, Q., Wang, Y.Y. and Zhai, X.M., 2006. OBS situ calibration research in the turbidity maximum of the Changjiang Estuary, China, Journal of Sediment Research, (5), 52–58. (in Chinese)

    Google Scholar 

  6. McAnally, W.H., Friedrichs, C., Hamilton, D., Hayter, E., Shrestha, P., Rodriguez, H., Sheremet, A. and Teeter, A., 2007a. Management of fluid mud in estuaries, bays, and lakes. I: Present state of understanding on character and behavior, Journal of Hydraulic Engineering, 133(1), 9–22.

    Article  Google Scholar 

  7. McAnally, W.H., Teeter, A., Schoellhamer, D., Friedrichs, C., Hamilton, D., Hayter, E., Shrestha, P., Rodriguez, H., Sheremet, A. and Kirby, R., 2007b. Management of fluid mud in estuaries, bays, and lakes. II: Measurement, modeling, and management, Journal of Hydraulic Engineering, 133(1), 23–38.

    Article  Google Scholar 

  8. Schettini, C.A.F., De Almeida, D.C., Siegle, E. and De Alencar, A.C.B., 2010. A snapshot of suspended sediment and fluid mud occurrence in a mixed-energy embayment, Tijucas Bay, Brazil, Geo-Marine Letters, 30(1), 47–62.

    Article  Google Scholar 

  9. Wang, Z.X., Zhou, F.N., Zhang, M.F., Wang, D.W., 2009. Quality control method of GPS positioning for underwater topographic survey without tide gauge, Yangtze River, 39(19), 72–75. (in Chinese)

    Google Scholar 

  10. Wu, J.X., Zhang, S.Y. and Ren, L.F., 2003. Field observations of current and suspended sediment concentration during sediment disposal in the Changjiang (Yangtze) Estuary, Acta Oceanologica Sinica, 25(4), 91–103. (in Chinese)

    Google Scholar 

  11. Wu, Q.S., Shi, W.Y., Xu, X.F. and Song, Z.K., 2015. Characteristics of tidal waves in the tidal channels of Xiangshan Harbour and the influence factors, Marine Science Bulletin, 34(5), 518–529. (in Chinese)

    Google Scholar 

  12. Xu, B.H. and Wang, Z.X., 2009. Study on the observation of the fluid mud in the Waiganmen shallow section in the approach channel of Xiangshan Port, Yangtze River, 40(22), 67–68. (in Chinese)

    Google Scholar 

  13. Yang, M. and Pan, W., 2012. Design and application of new type integrated silt detector, Transducer and Microsystem Technologies, 31(4), 106–108. (in Chinese)

    Google Scholar 

  14. Zhou, F.N. and Tian, C., 2001. Underwater topographic survey with GPS under no-tidal mode, Bulletin of Surveying and Mapping, (5), 28–30. (in Chinese)

    Google Scholar 

  15. Zhou, H.Q., Sun, Z.C., Li, B.G., Wu, X.Y., Gong, M. and Yang, H., 2014. Distribution changes of suspended sediment concentration and its Dynamic analysis in Xiangshan Bay, Zhejiang Province, Marine Science Bulletin, 33(6), 694–702. (in Chinese)

    Google Scholar 

Download references

Acknowledgements

We are grateful to all the participants in the extension project (2x1000 MW) of Xiangshan Port, Zhejiang Province, China (2x1000 MW) for their contribution in trial dredging, siltation monitoring, and mud observation in the shallow section of the Waiganmen of Xiangshan Port. This research was also supported by the expansion project of Guohuanning Power Plant in Zhejiang Province.

Author information

Affiliations

Authors

Corresponding author

Correspondence to De-an Wu.

Additional information

Foundation item: This work was financially supported by the National Natural Science Foundation of China (Grant No. 41776024) and the National Key R&D Program of China (Grant No. 2017YFC0405400).

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Ding, J., Hu, G., Wang, Z. et al. Fluid Mud Measurement and Siltation Analysis in A Trial Excavated Channel in the Approach Channel of the Xiangshan Port. China Ocean Eng 34, 421–431 (2020). https://doi.org/10.1007/s13344-020-0038-0

Download citation

Keywords

  • excavation trench
  • fluid mud
  • backsilting
  • measurement
  • tidal current
  • dynamic mechanism