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利用水介质光辐射传输数值模型Hydrolight,结合前人对长江口及邻近海域水体的生物—光学模型研究,模拟不同光学水体的遥感反射率,并分析遥感反射率对悬浮颗粒物(SPM)的敏感性以及SPM对4种叶绿素a(Chla)反演算法(二波段、三波段、荧光基线高度(FLH)和综合叶绿素指数(SCI)算法)的影响。结果表明:由Hydrolight模拟得到的遥感反射率与现场同步实测的遥感反射率的均方根误差小于0.01sr-1,其中可实现遥感反射率在550~725nm波段较精确的模拟。遥感反射率对SPM的敏感性随着Chla浓度的升高而降低。二波段、三波段算法适合低SPM浓度水体的Chla浓度反演,FLH算法反演Chla浓度时易受SPM的影响,而SCI算法在中、高SPM浓度水体中消除SPM的影响进而反演Chla的潜力较好。
Hydrolight, a numerical model based on optical transmission of aqueous media, was used to simulate the remote sensing reflectance of different optical water bodies based on the previous studies on the bio-optics of the Yangtze River estuary and its adjacent waters. The sensitivity of remote sensing reflectance to suspended particulate matter (SPM) And the effects of SPM on four Chla inversion algorithms (two-band, three-band, FLH, and SCI). The results show that the root mean square error (RMSE) of remote sensing reflectivity obtained from Hydrolight simulation and remote sensing reflectivity measured on site is less than 0.01sr-1, in which the more accurate simulation of remote sensing reflectivity in the 550-725nm band can be achieved. Sensitivity of remote sensing reflectivity to SPM decreased with increasing Chla concentration. The two-band and three-band algorithms are suitable for Chla concentration inversion in low SPM water. The FLI algorithm is easily affected by SPM when Chla concentration is inverted. However, the SCI algorithm can eliminate the influence of SPM in medium and high SPM concentration water, Potential is better.