文中分別使用細顆粒均質玻璃珠及現場所採集到的底部表層底沙作為懸浮微粒來進行儀器濃度率定實驗。將光學濁度儀對玻璃珠及現場底沙率定曲線進行比較，結果顯示在特定濃度內，量測值會與均質懸浮微粒濃度呈現線性關係，超過此濃度後，率定曲線會呈現非線性情況。另外研究證實，於特定濃度範圍內，聲學都卜勒流速儀所接收的反射訊號強度會與水體內懸浮微粒濃度呈線性關係，顯示聲學都卜勒流速儀未來應可成為量測現場懸浮沉積物濃度變化的儀器。本研究將實驗結果與Ha et al.[2009]的結果進行比較，發現在均質及現場懸浮質的量測環境下，聲學都卜勒流速儀的率定曲線趨勢有相似的變化。 ;The study aims to investigate the suspended sediment concentration (SSC) for uniform and non-uniform particles using Acoustic Doppler Velocimeter Ocean（ADVO）and Optical Backscatter Sensor（OBS）. Because the backscatter intensity of the transmitted signals from the acoustic and optical sensors varies depending on the SSC in the water, it is possible to find an empirical correlation function between the measured backscatter intensity and the SSC. Because air bubbles and non-uniform distributed SSC in the water can affect the calibration results, we try to exclude these factors in advance to increase the calibration accuracy. We developed a new calibration tank and perform the verification of spatial uniformity, and experimental repeatability. The results show that the calibration tank and the experimental methods can be used to calibrate the SSC.
In this study, artificial uniform glass particles and non-uniform sediment particles sampled from the field over an algal reef are used for calibration. The calibration curves of the optical sensor for the uniform glass particles and field sediment particles are compared; it is found that the backscatter intensity shows a linear trend with the SSC within a specific range of SSC, and then the gradient between the SSC and backscatter decreases when the SSC exceeds the specific value. In addition, the study confirms the linear relationship between the acoustic backscatter intensity and the SSC for a specific SSC which indicating that ADVO could be used to measure the change of SSC in fields. Finally, we compared the results with Ha at el. [2009], and found that the trends of the calibration curves of the ADVs are similar to their results even though different sediment particles are used in the two experiments.
