高浊度水体光学测量仪器的比较与验证  

Comparison and Verification of Optical Measurement Instruments for High Turbidity Water

作　　者：杨孟毅 蒋雪中[1] 何青[1] 

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200062

出　　处：《红外》2017年第12期6-12,共7页Infrared

基　　金：国家重点研发计划项目(2016yfa0600904);国家自然科学基金项目(41376098);上海市科委重大项目(16DZ1205403)

摘　　要：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34ms时,两者的差异最小,其在412nm、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(R^2=0.78)比Hypersas光谱仪的(R^2=0.67)高。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(R^2=0.78), which is higher than that modeled by the Hypersas spectrometer(R^2=0.67).

关 键 词：光学测量 光谱反射率 高浊度水体 长江口 

分 类 号：TH744.1[机械工程—光学工程]