摘要
利用2014年7月21～23日南四湖水体实测的高光谱数据及同步水质采样分析数据,分别建立了估测南四湖悬浮物浓度的单波段、波段比值和一阶微分模型,并通过悬浮物浓度间接估测了水体的浊度。结果表明,829 nm处归—化反射率模型、R829/R542、R756/R748、R748/R756波段比值模型和754 nm处—阶微分模型均估测悬浮物浓度精度较高,均方根误差在8.96～36.54 mg/L之间,平均相对误差均低于30%;829 nm处原始光谱反射率和归—化光谱反射率模型及R829/R542波段比值模型间接估测浊度效果较好,均方根误差在24.05～32.04 NTU之间,平均相对误差均小于35%;829 nm处归—化反射率模型和R829/R542波段比值模型更适合估测南四湖悬浮物浓度和浊度。
According to the measured hyperspectral data and synchronous sampling data about the water quality oi Nansi Lake on July 21 to 23,2014,the single band model,the band ratio model and the first-order differential model were established,respectively.Turbidity of water body is indirectly estimated via suspended solid concentration.The results demonstrate that the normalized reflectance model in 829 nm,the band ratio model of R829/R542,R756/R748,R748/R756 and the first-order differential model in 754 nm show a higher precision to estimate suspended solid concentration.The RMSEs are between 8.96 and 36.54 mg/L and the AREs are all less than 30%.The original spectral reflectance model and normalized reflectance model in 829 nm,the band ratio model of R829/R542 show a higher precision to estimate turbidity indirectly.The RMSEs are between 24.05 and 32.04 NTU and the AREs are all less than 35%.The normalized reflectance model in 829 nm and the band ratio model of R829/R542 are more suitable for estimating suspended solid concentration and turbidity.
出处
《水电能源科学》
北大核心
2016年第1期40-44,共5页
Water Resources and Power
基金
"十二五"国家科技支撑计划课题(2013BAB05B01)
高分辨率对地观测系统重大专项(08-Y30B07-9001-13/15-01)
国家自然科学基金项目(51309254
51209223)
中国水利水电科学研究院科研专项(资基本科研1401)
中国水利水电科学研究院流域水循环模拟与调控国家重点实验室开放研究基金资助(IWHR-SKL-201517)
关键词
南四湖
高光谱
悬浮物
浓度
浊度
关系
Nansi Lake
hyperspectrum
suspended solid
concentration
turbidity
relationship
