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| 上海洋山建港后港域夏季水文泥沙状况分析 | |
| 引用本文： | 李 鹏,杨世伦,龚文浩,徐小弟.上海洋山建港后港域夏季水文泥沙状况分析[J].海洋工程,2009,27(2):81-88. |
| 作者姓名： | 李 鹏 杨世伦 龚文浩 徐小弟 |
| 作者单位： | 1. 华东师范大学,河口海岸学国家重点实验室,上海,200062;国家海洋局,东海标准计量中心,上海,200080 2. 华东师范大学,河口海岸学国家重点实验室,上海,200062 3. 国家海洋局,东海标准计量中心,上海,200080 |
| 基金项目： | 国家自然科学基金，上海市科委重点科技项目，国家自然科学基金委创新群体资助项目 |
| 摘 要： | 对2007年9月17-26日在上海洋山港海域固定观测点(平均水深13 m)观测得到的水文泥沙要素,以及悬沙和底质样品分析.分析结果为:1)港域有效波高0.21-1.37 m(风速0.6～14.0 m/s),平均0.61 m(平均风速5.5 m/s).平静天气(平均风速小于5.0 m/s)下,波高随水深变化,两者的相关系数为0.899;而在强风天气下,波高受风况控制.2)最大表层流速超过2.00 m/s.大潮涨潮流占优势,小潮时落潮流占优势;与北岛链汉道封堵前相比,大潮涨、落潮平均流速分别减小15%和30%,小潮涨、落潮平均流速均减小30%～40%.各层余流均为西北方向,与涨潮流方向一致;垂向平均余流速0.11 cm/s,表层达0.25 m/s.3)离底高程1.35 m层和0.35m层最大悬沙浓度均大于3 kg/m3,两层平均悬沙浓度分别为0.89和0.95 kg/m3.无论大潮还是小潮涨潮悬沙浓度均大于落潮,这种现象在大潮时更为显著,潮周期中最大悬沙浓度出现在涨急.与工程前相比悬沙浓度明显降低,大、小潮降低均达20%.4)港区底质平均粒径9.0μm,工程后有变细的趋势. |
| 关 键 词： | 波浪 潮流 悬沙浓度 悬沙和底质粒径 洋山港区 |
| 收稿时间： | 2008/7/18 0:00:00 |
| 修稿时间： | 2009/1/3 0:00:00 |
Hydrographic and sedimentary condition in summer in the Yangshan Harbor area after the harbor construction |
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| YANG Wen-wu,QIAN Jue-shi and ZHANG Yi-ying.Hydrographic and sedimentary condition in summer in the Yangshan Harbor area after the harbor construction[J].Ocean Engineering,2009,27(2):81-88. | |
| Authors: | YANG Wen-wu QIAN Jue-shi and ZHANG Yi-ying |
| Institution: | 1.State Key Lab of Estuarine and Coastal Research;East China Normal University;Shanghai 200062;China;2.East center of Standard and Metrology;SOA;Shanghai 200080;China |
| Abstract: | It is necessary to pay more attention to the durability of concrete undergoing freeze-thaw cycles and seawater attack simultaneously. Investigated are the effects of water-binder ratio, fly ash (FA) contents and air-entraining agent on resistance to frost and chloride diffusion of marine concrete blended with FA in natural seawater. The results show that fly ash does not improve the frost resistance of concrete but can improve its resistance to chloride diffusion by addition of less than 30%. The resistance to frost and chloride diffusion of FA concrete can be improved with the decrease of water-binder ratio, and FA may improve both of them simultaneously only being mixed with air-entraining agent. A ratio (named as R) of the frost-resisting durability factor to chloride diffusion coefficient can be used to evaluate the durability of marine concrete. Scanning electron microscope (SEM) analyses are consistent with the evaluations by the value of R. |
| Keywords: | fly ash marine concrete freezing-thawing chloride ions diffusion assessment method |
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