| 潮流作用下洋山港水域悬沙和底沙的交换 |
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| 引用本文： | 陈沈良,李向阳,俞航,谷国传.潮流作用下洋山港水域悬沙和底沙的交换[J].海洋学研究,2008,26(1):11-17. |
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| 作者姓名： | 陈沈良 李向阳 俞航 谷国传 |
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| 作者单位： | 华东师范大学,河口海岸学国家重点实验室,上海,200062 |
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| 基金项目： | 国家自然科学基金资助项目(40231010) |
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| 摘 要： | 通过对泥沙起动流速、淤积流速和不淤流速的计算,划定了悬沙和底沙交换的各个时段,提出了冲刷悬沙浓度、淤积悬沙浓度和不淤悬沙浓度的概念及其计算方法;继而导出了潮流作用下悬沙和底沙在交换层面上单位面积的日交换量计算式,并用于洋山港水域的冲淤计算。结果表明:自然状况下洋山港水域北部年淤积量为37.5 kg/m2,淤高了1.77 cm/a,属微淤;中部年冲刷量为10.0 kg/m2左右,刷深不超过0.52 cm/a,可认为冲淤平衡;南部年冲刷量为55.5 kg/m2,刷深了2.60 cm/a,属微冲。这一结果与该水域海床的自然冲淤状况相吻合。
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| 关 键 词： | 泥沙交换 悬沙浓度 潮流流速 洋山港 |
| 文章编号： | 1001-909X(2008)01-0011-07 |
| 修稿时间： | 2006年3月2日 |
Exchange between suspended sediments and bed sediments under tidal current action in the Yangshan Harbor waters |
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| CHEN Shen-liang,LI Xiang-yang,YU Hang,GU Guo-chuan.Exchange between suspended sediments and bed sediments under tidal current action in the Yangshan Harbor waters[J].Journal of Marine Sciences,2008,26(1):11-17. |
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| Authors: | CHEN Shen-liang LI Xiang-yang YU Hang GU Guo-chuan |
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| Abstract: | Through the calculation of initial movement velocity,depositional velocity and balance velocity of sediments,the responding time stages of exchanges of suspended sediments and bed-located sediments are determined,and put forward the concepts and calculation methods of erosion SSC,depositional SSC and balance SSC.Thus the formula of sediment exchange magnitude is derived for the exchange between suspended sediments and bed-located sediments under the actions of tidal currents,and applied in the waters of Yangshan Harbor.The results show that in north part of the waters the annual deposition is 37.5 kg/m2(rate: 1.77 cm/a,slight deposition),in middle part annual erosion about 10 kg/m2(0.5 cm/a,near to balance),and in south part,the annual erosion is 55.5 kg/m2(2.60 cm/a,slight erosion).The results are consistent with natural erosion/depositional features for the seabed of the waters recently. |
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| Keywords: | sediment exchange suspended sediment concentration tidal current velocity Yangshan Harbor |
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