摘要
通过实验室含沙水体的配比试验,对不同浓度含沙水体进行了光学特性测量,建立了不同悬沙含量遥感反演模型,结果表明:1)确立的水体光谱反射率和悬沙浓度之间的数值关系,为用卫星遥感技术探测表层悬沙浓度做了基础性的研究,取得了令人满意的效果;2)悬沙水样的敏感波段位于700nm^720nm,730~750nm和800~850nm;3)利用主成分分析方法结合多元线性回归可较为精确地估算悬沙含量,其模型反演能力明显优于敏感波段线性模型。对于浓度范围为0.1905g/L^3.6991g/L的悬沙水体,主成分回归模型反演精度更高,反演值和实测值的平均相对误差仅为5%左右;4)用实验室含沙水体配比方法进行的悬沙浓度与光谱关系的研究,其数据采集的同步性好,精度可靠。
Several suspended sediment inversion models were constructed by experimental study on reflected spectrum of suspended sediment with different concentration. The results show that： （1） The numerical relationship between the spectrum reflectance and suspended sediment concentration is established, which is the basis for the suspended sediment concentration retrieval by satellite remote sensing. （2）The range of the sensitive bands for suspended sediment water are from 600nm to 720nm and 800nm to 850nm. （3）The model constructed by the ways of principal component analysis combined with the multivariate linear regression （MPCAR） allows the amount of suspended sediment to be retrieved at a relatively high accuracy. The MPCAR is more accurate than the linear model of sensitive bands（LMSB）, The MPCAR can retrieve the suspended sediment in the 0. 1905g/L - 3.6991g/L with high precise and the mean relative error between the measured only about 5%. （4） The experimental spectrum measurement of suspended sediment concentration ensures to acquire the synchronous and high accurate data. concentration range of and retrieved value is water with different
出处
《泥沙研究》
CSCD
北大核心
2007年第5期36-41,共6页
Journal of Sediment Research
基金
国家自然基金重点项目<长江流域调水等工程对河口环境的影响及对策>(50339010)
中国气象局气候研究开放实验项目(LY-2007-2012205)
淮河流域气象开发基金项目(HX2007)
关键词
悬浮泥沙
光谱
主成分分析
模型
suspended sediment
spectrum
principal component analysis
model
