Fine-grained sediment transport and resuspension process in a tidal channel of the northern Hangzhou Bay in China

YANG Yang; GAO Shu; WANG Ya-ping

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YANG Yang, GAO Shu, WANG Ya-ping. Fine-grained sediment transport and resuspension process in a tidal channel of the northern Hangzhou Bay in China[J]. Haiyang Xuebao, 2008, 30(2): 92-101.

Citation:

YANG Yang, GAO Shu, WANG Ya-ping. Fine-grained sediment transport and resuspension process in a tidal channel of the northern Hangzhou Bay in China[J]. Haiyang Xuebao, 2008, 30(2): 92-101.

YANG Yang, GAO Shu, WANG Ya-ping. Fine-grained sediment transport and resuspension process in a tidal channel of the northern Hangzhou Bay in China[J]. Haiyang Xuebao, 2008, 30(2): 92-101.

Citation:

YANG Yang, GAO Shu, WANG Ya-ping. Fine-grained sediment transport and resuspension process in a tidal channel of the northern Hangzhou Bay in China[J]. Haiyang Xuebao, 2008, 30(2): 92-101.

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Fine-grained sediment transport and resuspension process in a tidal channel of the northern Hangzhou Bay in China

Key Laboratory of Ministry of Education for Coast and Island Development, Nanjing University, Nanjing 210093, China

Received Date: 2007-05-23
Rev Recd Date: 2007-10-17

Abstract

Abstract

Tidal cycle measurements of current velocities and suspended sediment concentrations were carried out at four stations in a tidal channel(Jinshan Channel)in the northern Hangzhou Bay in China during a spring tide period in May 2005,together with water and seabed sediment sampling.Data sets were analyzed to obtain suspended sediment transport rates and resuspension fluxes.The results show that the tidal channel is dominated at the flood stage,with at idalrange increasing from the bay mouth tow ards the bay-head areas.The suspended sediment consists mainly of silts,poorly sorted and mostly negatively skewed, being consistent with the bed matter.In the central part of the channel,the net sediment transport direction which directs tow ards the bayhead differs from the residual current direction.In the other parts,the two directions are consistent,being directed tow ards the south in the east and tow ards the bay head in the west.Except for the slack water stage,the vertical distribution patterns of current speed can be described by the Kûrmûn-Prandtl model,with the calculated shear velocity having a similar trend to the vertically averaged current velocity.At most stations,the calculated apparent roughness length show satrend of increase from the beginning of flow acceleration to the end of flow deceleration during both flood and ebbphases of the tide,with extremely large values.Such a pattern cannot be explained by form drag alone;it may be result from a combined effect of high suspended sediment concentration and stratification due to vertical concentration differences within the water column.Further observations and analyses of the associated mechanisms are required to examinet his hypothesis.It is shown that the occurrence of resuspension and the measured suspended sediment concentrations have the same periodicity and the maximum concentration lags behind the maximum resuspension flux,indicating that the resuspension process represents animportant factor controlling the concentration within the water column.
- suspended sediment transport,
- resuspension,
- boundary layer processes,
- tidal channels,
- Hangzhou Bay in China

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References(46)

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