Wave-current bottom shear stresses and sediment re-suspension in the mouth bar of the Modaomen Estuary during the dry season

JIA Liangwen; REN Jie; NIE Dan; CHEN Benzhong; LV Xiaoying

doi:10.1007/s13131-014-0510-x

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Article Navigation > Acta Oceanologica Sinica > 2014 > 33(7): 107-115

JIA Liangwen, REN Jie, NIE Dan, CHEN Benzhong, LV Xiaoying. Wave-current bottom shear stresses and sediment re-suspension in the mouth bar of the Modaomen Estuary during the dry season[J]. Acta Oceanologica Sinica, 2014, 33(7): 107-115. doi: 10.1007/s13131-014-0510-x

Citation:

JIA Liangwen, REN Jie, NIE Dan, CHEN Benzhong, LV Xiaoying. Wave-current bottom shear stresses and sediment re-suspension in the mouth bar of the Modaomen Estuary during the dry season[J]. Acta Oceanologica Sinica, 2014, 33(7): 107-115. doi: 10.1007/s13131-014-0510-x

Citation:

JIA Liangwen, REN Jie, NIE Dan, CHEN Benzhong, LV Xiaoying. Wave-current bottom shear stresses and sediment re-suspension in the mouth bar of the Modaomen Estuary during the dry season[J]. Acta Oceanologica Sinica, 2014, 33(7): 107-115. doi: 10.1007/s13131-014-0510-x

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Wave-current bottom shear stresses and sediment re-suspension in the mouth bar of the Modaomen Estuary during the dry season

doi: 10.1007/s13131-014-0510-x

Center for Coastal Ocean Science and Technology Research, Sun Yat-sen University, Guangzhou 510275, China

Received Date: 2013-07-21
Rev Recd Date: 2014-01-24

Abstract

Abstract

On the basis of the measurement data pertaining to waves, current, and sediment in February 2012 in the mouth bar of the Modaomen Estuary, the Soulsby formulae with an iterative method are applied to calculating bottom shear stresses (BSS) and their effect on a sediment re-suspension. Swell-induced BSS have been found to be the most important part of the BSS. In this study, the correlation coefficient between a wavecurrent shear stress and SSC is 0.86, and that between current shear stresses and SSC is only 0.40. The peaks of the SSC are consistent with the height and the BSS of the swell. The swell is the main mechanism for the sediment re-suspension, and the tidal current effect on sediment re-suspension is small. The peaks of the SSC are centered on the high tidal level, and the flood tide enhances the wave shear stresses and the SSC near the bottom. The critical shear stress for sediment re-suspension at the observation station is between 0.20 and 0.30 N/m². Tidal currents are too weak to stir up the bottom sediment into the flow, but a WCI (wave-current interaction) is strong enough to re-suspend the coarse sediment.
- Modaomen Estuary,
- wave-current,
- bottom shear stresses,
- sediment

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References(30)

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