| 底边界层水沙观测系统和应用 |
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| 引用本文： | 徐俊杰,何 青,王元叶.底边界层水沙观测系统和应用[J].海洋工程,2009,27(1):55-61. |
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| 作者姓名： | 徐俊杰 何 青 王元叶 |
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| 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
2. 华东师范大学,河口海岸学国家重点实验室,上海200062;交通部上海河口海岸科学研究中心,上海201201 |
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| 基金项目： | 国家自然科学基金创新团队资助项目，国家重点基础研究发展规划(973计划)，上海市科委重大基础资助项目 |
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| 摘 要： | 利用现代先进的光学和声学测量仪器(ADP、PC-ADP、ADV、OBS等),组制四角架观测系统用于底边界层的水沙观测.此观测系统既可获取垂向流速场,更可获取常规水文观测难以获取的高分辨率的近底流速、近底单点紊动过程、近底温盐沙和波浪过程.利用此观测系统于2007年8月在长江口北槽最大浑浊带内进行了实地观测.分析四角架观测数据与同步船测底部数据表明,四角架观测系统在近底(特别是底部明显分层)观测时表现出明显优势.常规水文观测测得底部含沙量一般只相当于距底70～120 cm高度含沙量;船测底部最大含沙量为5.8 kg/m 3,而架测距底30 cm处最大含沙量有25 kg/m 3;近底含沙量较高时往往出现强分层,强分层时实测距底30 cm处含沙量可达距底120 cm处含沙量的5倍;船测底部流速比架测距底30 cm处流速平均偏大45%;但距底30 cm处最大流速仍可达1.2 m/s.船测数据也验证了四角架观测数据的正确性.
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| 关 键 词： | 四角架 底边界层 泥沙 流速 长江口 |
| 收稿时间： | 2007/11/15 0:00:00 |
| 修稿时间： | 2008/9/23 0:00:00 |
Application of instrumented tetrapod in bottom boundary layer for water-sediment measurement |
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| YAN Bing and ZHANG Qing-he.Application of instrumented tetrapod in bottom boundary layer for water-sediment measurement[J].Ocean Engineering,2009,27(1):55-61. |
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| Authors: | YAN Bing and ZHANG Qing-he |
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| Institution: | 1.State Key Laboratory of Estuarine and Coastal Research;East China Normal University;Shanghai 200062;China;2.Estuarine and Coastal Science Research Center;Shanghai 201201;China |
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| Abstract: | According to the mechanism of sediment suspension under waves, namely, the main reason of sediment suspension changes from the turbulent mixing in the bottom boundary layer to the periodic motion of the water particle near the free water surface, a three-layer model of sediment concentration distribution due to waves is presented along the whole water depth based on the concept of the finite mixing length. The determination of the parameters in the model is discussed and an empirical formula is suggested. Comparisons between the calculated results and the measurements indicate that the results of the model agree well with the data from both the large and small scale flume experiments. |
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| Keywords: | tetrapod bottom boundary layer sediment velocity the Yangtze estuary |
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