| 磨刀门拦门沙区域枯季波流共同作用近底切应力和泥沙运动研究 |
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| 作者姓名： | JIA Liangwen REN Jie NIE Dan CHEN Benzhong LV Xiaoying |
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| 作者单位： | Center for Coastal Ocean Science and Technology Research, Sun Yat-sen University, Guangzhou 510275, China;Center for Coastal Ocean Science and Technology Research, Sun Yat-sen University, Guangzhou 510275, China;Center for Coastal Ocean Science and Technology Research, Sun Yat-sen University, Guangzhou 510275, China;Center for Coastal Ocean Science and Technology Research, Sun Yat-sen University, Guangzhou 510275, China;Center for Coastal Ocean Science and Technology Research, Sun Yat-sen University, Guangzhou 510275, China |
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| 基金项目： | The Program of International S&T Cooperation under contract No. 2010DFA24470;the National Science Foundation of China under contract No. 41376101;the Guangdong Provincial Science and Technology Planning Project under contract Nos 2012A030200002 and 2011B031100008 |
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| 摘 要： | 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 resuspension. 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.
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| 关 键 词： | 沉积物再悬浮 剪切应力 应力和 磨刀门 电流 河口 旱季 波流相互作用 |
| 收稿时间： | 2013/7/21 0:00:00 |
| 修稿时间： | 2014/1/24 0:00:00 |
Wave-current bottom shear stresses and sediment re-suspension in the mouth bar of the Modaomen Estuary during the dry season |
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| 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. |
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| Authors: | JIA Liangwen REN Jie NIE Dan CHEN Benzhong and LV Xiaoying |
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| Institution: | Center for Coastal Ocean Science and Technology Research, Sun Yat-sen University, Guangzhou 510275, China |
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| 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. |
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| Keywords: | Modaomen Estuary wave-current bottom shear stresses sediment |
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