江苏废黄河口光学后向散射浊度计的沉积物标定

SEDIMENT CALIBRATIONS USING OBS COUNTS OFF ABANDONED YELLOW RIVER MOUTH OF JIANGSU PROVINCE

以往的光学后向散射浊度计(Optical Backscatter,OBS)标定,多用其输出的浊度值进行研究,此研究目的是对OBS的原始输出的值进行了标定。利用在江苏北部废黄河口获得的表层沉积物样品和水样悬沙数据,分别对OBS的原始输出的值进行了室内标定和现场标定。结果表明:OBS值与悬沙含量呈强的线性关系,特别是在近岸悬浮体含量较高的水域。此外,室内用表层沉积物标定结果获得的悬沙含量值比实有含沙量高。像OBS的浊度值一样,OBS的原始输出的值能应用于悬沙的分析。这说明,即使没有浊度标定文件,使用OBS获得的数据也可以进行悬沙含量分析。

Former workers used NTU values of an optical backscatter（OBS） to do sediment calibrations. Here we report the relation of counts values of OBS and suspended sediment concentration （SSC）. The relation between OBS counts and SSC was established using laboratory calibration and in-situ calibration off old Yellow River mouth of Jiangsu Province. The relationship between OBS counts and SSC shows that OBS counts can be used to monitor the SSC. The results show strong linear relation between OBS counts and the SSC. The in-situ calibration can be used well in this area, while the laboratory calibration overestimates the SSC when it is used to calibrate in-situ data. And the difference of in-situ calibration between near shore sites and open sea site indicates that OBS observation is suitable for monitoring high SSC water.