1 / 31

Estuary flocculation and sediment dynamics in Jiulong River mouth

MOE KLCID. Nanjing University. Estuary flocculation and sediment dynamics in Jiulong River mouth. Yang Yang （杨 旸） yangy@nju.edu.cn MOE Key Laboratory for Coast and Island Development School of Geography and Ocean Science Nanjing University Nov., 2013. MOE KLCID. Nanjing University.

ayala
Download Presentation

Estuary flocculation and sediment dynamics in Jiulong River mouth

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MOE KLCID Nanjing University Estuary flocculation and sediment dynamics in Jiulong River mouth Yang Yang （杨 旸） yangy@nju.edu.cn MOE Key Laboratory for Coast and Island Development School of Geography and Ocean Science Nanjing University Nov., 2013

  2. MOE KLCID Nanjing University Contents • Introduction & Study Area • Data collection and processing • Results • Hydrodynamics • Floc size, settling velocity and turbulence • Summary

  3. Study Area Jiulong River Estuary Jiulong River has a total length of 1,148 km. Annual water discharge is 12×109 m3, with 70% occurring between April to September (wet season) . Max. tidal range ~ 5.6m

  4. MOE KLCID Nanjing University Previous finding Survey line Coarse sediment in the upper layer? Floc? Relative distance (km)

  5. MOE KLCID Nanjing University Floc Survey line Dyer & Manning (1999)

  6. MOE KLCID Nanjing University Winterwerp (1998) Survey line Buonassissi&Dierssen(2010) Wolanski et al.(1992) Floc size ~ Ws SSC Hydro.

  7. Study Area Anchor Station

  8. MOE KLCID Nanjing University Field data collection SBE26 EMCM OBS ADV ADV OBS ADV OBS

  9. MOE KLCID Nanjing University • Tripod Diver

  10. MOE KLCID Nanjing University • CTD • LISST • water samples • ADCP

  11. MOE KLCID Nanjing University OBS SSC calibration ADCP

  12. MOE KLCID Nanjing University ADV SSC calibration ADV

  13. Settling velocity MOE KLCID Nanjing University (1) Rouse-type equation (2) sediment flux method (Fugate & Friedrichs, 2002)

  14. Tides MOE KLCID Nanjing University

  15. Spring Neap MOE KLCID Nanjing University Current velocity and SSC profiles

  16. Spring Neap MOE KLCID Nanjing University Salinity and sus. sed. size profiles

  17. Spring Neap MOE KLCID Nanjing University Current velocity and SSC profiles

  18. Spring Neap MOE KLCID Nanjing University Salinity and sus. sed. size profiles

  19. MOE KLCID Nanjing University

  20. MOE KLCID Nanjing University

  21. Spring Time relative to middle low water level(hour)

  22. Neap Time relative to middle low water level(hour)

  23. MOE KLCID Nanjing University constant shear

  24. MOE KLCID Nanjing University

  25. MOE KLCID Nanjing University suspended sediment size 215 LISST profiles 139 water samples

  26. MOE KLCID Nanjing University

  27. MOE KLCID Nanjing University

  28. MOE KLCID Nanjing University

  29. MOE KLCID Nanjing University

  30. MOE KLCID Nanjing University Summary • Multiple methods provided results with similar general patterns on the shear velocity and settling velocity estimations. • The SPM concentration variation was found to be similar as that of the shear velocity, which is dominated by resuspension within the bottom boundary layer. • The floc size variations are limited by the turbulent eddy evolution during a tidal cycle. The status of turbulent shear determines the aggregates and deflocculating processes, including the settling velocity. • JOURNAL OF GEOPHYSICAL RESEARCH: OCEANS, VOL. 118, 1–18, doi:10.1002/jgrc.20340, 2013

  31. MOE KLCID Nanjing University Thank you!

More Related