水利学报2011，Vol.42Issue(10)：1135-1143,9.
基于光谱特征的长江口细颗粒泥沙絮凝体投影表面积和沉速分析
Analysis on the projected surface area and settling velocity of fine-grained sediment flocs based on spectral characteristics in the Changjiang Estuary
摘要
Abstract
The in situ spectral reflectivity and physical characteristics of fine-grained suspended sediment flocs in surface water （0.Sm） at the Changjiang Estuary were measured by using spectroradiometer and a laser particle size analyzer respectively. Suspended sediment concentration （SSC） was attained simultaneously by water sample analysis. The analysis results show that ① Spectral reflectivity increased with increased projected surface area （PSA） of fine-grained suspended sediment flocs. Two spectral reflectivity peaks exist in 690-720nm and 810 nm band, respectively. ② Flocculation process changed the spectral characteristics of fine-grained suspended sediment, resulted in the correlation between PSA and spectral reflectivity larger than that between SSC and spectral reflectivity. The correlations between PSA and spectral reflectivity with band larger than 715 nm were bigger than 0.7 with a confidence level of p〈0.01. ③ The exponential relationship was the best one between single band spectral reflectivity and PSA, and also between multi-band spectral reflectivity ratio and PSA. The correlations of single band at 860nm with r=-0.9227 and p〈0.001, and multi-band spectral reflectivity ratio of 860/670 with r=-0.9373 and p〈0.001 were the best. ④ Based on the fine relationships between PSA and spectral reflectivity, as well as between PSA and settling veloci- ty （Ws） of floes, a power relationship with r=0.8337 and p〈0.001 was establish between spectral reflectiv- ity and Ws which could provide a new attemptable method to understand the distribution and changing process of PSA and Ws of fine-grained suspended sediment at a large scale in the Changjiang Estuary.关键词
光谱反射率/细颗粒泥沙/絮凝/投影表面积/沉速/长江口Key words
spectral reflectivity/fine-grained sediment/flocculation/projected surface area/settling velocity/Changjiang Estuary分类
建筑与水利引用本文复制引用
程江,蒋雪中..基于光谱特征的长江口细颗粒泥沙絮凝体投影表面积和沉速分析[J].水利学报,2011,42(10):1135-1143,9.基金项目
国家自然科学基金项目（51009068 （）
40801201 （）
40601071）华东师范大学何青教授、袁琳博士对本文提出了宝贵意见,华东师范大学张俊儒硕士和赵捷博士参与了现场数据观测,谨致谢忱. （）
