Bedform dynamics and suspended sediment transport near sea bottom in the south of Beibu Gulf

MA Xiaochuan; YAN Jun; FAN Fengxin; WANG Shiwen; YAO Ping

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MA Xiaochuan, YAN Jun, FAN Fengxin, WANG Shiwen, YAO Ping. Bedform dynamics and suspended sediment transport near sea bottom in the south of Beibu Gulf[J]. Haiyang Xuebao, 2012, 34(4): 109-120.

Citation:

MA Xiaochuan, YAN Jun, FAN Fengxin, WANG Shiwen, YAO Ping. Bedform dynamics and suspended sediment transport near sea bottom in the south of Beibu Gulf[J]. Haiyang Xuebao, 2012, 34(4): 109-120.

MA Xiaochuan, YAN Jun, FAN Fengxin, WANG Shiwen, YAO Ping. Bedform dynamics and suspended sediment transport near sea bottom in the south of Beibu Gulf[J]. Haiyang Xuebao, 2012, 34(4): 109-120.

Citation:

MA Xiaochuan, YAN Jun, FAN Fengxin, WANG Shiwen, YAO Ping. Bedform dynamics and suspended sediment transport near sea bottom in the south of Beibu Gulf[J]. Haiyang Xuebao, 2012, 34(4): 109-120.

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Bedform dynamics and suspended sediment transport near sea bottom in the south of Beibu Gulf

1.
Graduate School of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
3.
Haikou Marine Environment Monitoring Center Station, State Oceanic Administration, Haikou 570311, China
4.
Zhanjiang Branch of CNOOC Ltd, Zhanjiang 524057, China

Received Date: 2010-10-09
Rev Recd Date: 2011-04-21

Abstract

Abstract

A platform with autonomous instruments was deployed over a period of 18 tide cycles in the south of Beibu Gulf to investigate sand transport and bedform dynamics, which collected continuous data of wave, current, SSC, and seabed changes. Analyses have been undertaken of SSC characteristics, suspended sediment flux, and the effect of current and wave on bedform dynamics and SSC variation. Results suggested that over the measurement period SSC variation was mainly affected by water-level fluctuation and current while wave was a less important factor. The exceedingly high SSC was probably caused by sediment sliding off the upstream sand wave. Suspended sediment flux changes comported with current velocity. There were presented remarkable variations of suspend sediment flux during flood-ebb and among tide cycles. A net transport for suspended sediment towards west and north were 15 158 kg·m^-1 and 2 934 kg·m^-1 respectively, the former of which was much larger than the latter under current. The limit of the EW-trending trough could lead to great difference between net transport flux in EW and in NS. The changes of seabed elevation varied among tide circles between 0.8 cm and 16.7 cm, which cm-scale bed level change in one tide cycle was probably generated by varying current velocity and asymmetric reversing current. These changes were most likely associated with migration of ripples. Sediment transporting downstream and modification of ripples’ profile gave reasonable interpretation of variation characteristics of seabed eletration.
- Beibu Gulf,
- suspended sediment,
- bedform dynamics,
- current,
- bottom shear stress

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References(33)

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