Comparison between measurements of suspended sediment concentration using ADP and OBS
Comparison between measurements of suspended sediment concentration using ADP and OBS
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发表时间：
2010
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通讯作者：
Yang Shi-lun
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作者：
Yang Shi-lun
2005年6月6-12日在长江口大潮和小潮期间利用ADP和OBS进行了悬浮泥沙浓度(SSC)的现场测量。(1)在水平方向上，ADP和OBS的SSC曲线分别发生位相变化，但ADP的SSC曲线比OBS的曲线平滑。(2)在水体中，ADP和OBS的SSC变化从表层到近床层逐渐增加。(4)ADP和OBS的SSC、信号幅值与NTU具有密切的相关性。因此，OBS可用于研究传感器附近SSC的变化，具有较高的精度。ADP可用于研究SSC的变化，ADP可在不干扰周围环境的情况下同步获取海流剖面信息。利用不同潮位获取的水样对OBS进行了标定，该方法既能减少野外作业负荷，又能保证ADP测量的精度，ADP和OBS的测量结果可以相互验证，因此，ADP和OBS联合观测是研究悬沙变化和悬沙输移过程的一种有效、可靠的方法。
Field measurement of suspended sediment concentration(SSC) using ADP and OBS was carried out in the Changjiang(Yangtze) Estuary during the spring and neap tides on June,6-12,2005.(1) In the horizontal direction,the curves of SSC by ADP and OBS changed in phase,respectively.Nevertheless,the curves of ADP were smoother than that of OBS.(2) In the water column,the change in SSC by ADP and OBS increased from the surface to near the bed,but the range of change depended on the different tidal phases and water layers.(3) The average relative errors of SSC by ADP and OBS were no more than 20%.(4) The SSC by ADP and OBS,the amplitude of signal and NTU had close correlation,respectively.Therefore,OBS can be used to study the changes in SSC near the sensor which has high precision.ADP can be used to study the changes in SSC and can obtain the information of current profiles in synchrony without interference in the surrounding environment in the field.Calibration of the OBS was made using the water samples obtained from the different tidal phases,and then the OBS was used to calibrate the ADP.This method could not only reduce the working load in the field,but also ensure the precision of SSC by ADP.The results of ADP and OBS can be validated each other.Thus,the combining observation by ADP and OBS is a way of efficiency and credibility for studying the changes in SSC and the suspended sediment transport processes.