高浊度水体光学测量仪器的比较与验证

利用2017年冬季航次的现场光谱测量数据以及同步 水文泥沙参数，讨论了ASD地物光谱仪和Hypersas海面光谱仪两种光学 测量仪器在长江口局地高浊度水域所测光谱数据的差异情况。结果表 明，Hypersas光谱仪所测的光谱值在整体上 比ASD光谱仪的高；当积分时间 为34 ms时，两者的差异最小，其在412 nm、443 nm、 490 nm、510 nm、 531 nm、555 nm、 670 nm和750 nm各个典型波段的平均相对差异值 分别为22.70%、18.73%、15.01%、 14.07%、13.05%、 11.93%、9.58%和9.85%。 通过分析和对比两组数据与同步实测的悬沙浓度数据的相关性以及 拟合精度可以发现，在局地模式下，ASD光谱仪所测的悬沙浓度 建模精度(R2=0.78)比Hypersas光谱仪的(R2=0.67)高。

Comparison and Verification of Optical Measurement Instruments for High Turbidity Water

In light of the in-situ spectral measurement data and the synchronous hydrological sediment parameters from the survey in 2017 winter, the difference of spectral data obtained by two kinds of optical instruments: an ASD spectrometer and a Hypersas sea surface spectrometer in the high turbidity water of the Yangtze Estuary is discussed. The results show that the spectral values measured by the Hypersas spectrometer are higher than those measured by the ASD spectrometer on the whole. For the integration time of 34 ms, the difference between the two instruments is lowest. The average relative difference values in the typical bands of 412 nm, 443 nm, 490 nm, 510 nm, 531 nm, 555 nm, 670 nm and 750 nm are 22.70%, 18.73%, 15.01%, 14.07%, 13.05%, 11.93%, 9.58% and 9.85% respectively. By analyzing the correlation and fitting accuracy of the two sets of data and the suspended sediment concentration data measured, it is found that in the local mode, the accuracy of suspended sediment concentration modeled by the ASD spectrometer is (R2=0.78), which is higher than that modeled by the Hypersas spectrometer (R2=0.67).