| OBS浊度标定与悬沙浓度误差分析 |
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| 引用本文： | 张文祥,杨世伦. OBS浊度标定与悬沙浓度误差分析[J]. 海洋技术学报, 2008, 27(4) |
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| 作者姓名： | 张文祥 杨世伦 |
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| 作者单位： | 华东师范大学河口海岸学周家重点实验室,上海,200062;华东师范大学河口海岸学周家重点实验室,上海,200062 |
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| 基金项目： | 河口海岸学国家重点实验室科研业务费技术开发课题 ， 上海市科委重大科研计划 |
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| 摘 要： | 利用光学后向散射浊度计OBS-3A,在长江河口南槽进行大小潮周期连续观测。利用OBS室内和现场浊度标定,计算不同潮时OBS观测悬沙浓度相对误差,并对影响其观测精度因素进行分析。主要结果有:(1)现场OBS标定R值比室内标定偏低,但也在0.8以上;(2)大潮平均相对误差值变化比小潮大,在悬沙浓度低于1.5kg/m3条件下,大小潮悬沙浓度平均相对误差都在15%以下;(3)悬沙粒径大小是影响OBS观测精度的主要因素,生物、泥沙颜色、水色和水中气泡等因素也对观测结果产生一定影响。
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| 关 键 词： | 悬沙浓度 OBS 浊度标定 相对误差 悬沙粒径 |
Turbidity Calibration of OBS and Errors Analysis of Suspended Sediment Concentration |
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| ZHANG Wen-xiang,YANG Shi-lun. Turbidity Calibration of OBS and Errors Analysis of Suspended Sediment Concentration[J]. Ocean Technology, 2008, 27(4) |
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| Authors: | ZHANG Wen-xiang YANG Shi-lun |
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| Abstract: | Observation of suspended sediment concentration over spring and neap tide was carried out using an optical backscatter sensor (OBS) from 6 to 12 June, 2005 in Changjiang estuary. Through calibration in lab. and field, the relative errors in different individual tidal cycles are calculated and the factors influencing the precision of OBS are analyzed. The result shows: (1)the value of R in situ is higher than 0.8, which is lower than that in lab; (2)the averaged value of relative error in spring tide is higher than that of in neap tide and the value is less than 15%.(3)the particle size is the main factor that influences the precision of OBS, while the biology, the color of particle and water, the air bubble in water have some effect on it. |
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| Keywords: | OBS |
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