基于TM影像的长江口悬沙浓度遥感反演定量模式研究

近年来，由于水利工程等因素，长江入海径流量变化较大并导致入海泥沙量明显呈下降趋势，必会影响海岸带环境．利用遥感技术研究泥沙含量不仅速度快，效率高，周期短，而且对分析河口海岸带冲淤变化，研究流域入海物质通量、物质循环、河口沙洲变化，港口建设，航道治理以及海岸带环境管理都有十分重要韵意义．利用长江口TM影像数据以及现场采集的多个长江口表层悬沙浓度数据，建立悬沙浓度遥感定量反演模式．通过对遥感数据预处理，运用不同的悬沙反演模式进行回93分析，得到低浓度悬沙水体运用多项武模式反演效果较好，高浓度表层悬沙水体运用乘幂模式反演效果较好，同时应用Arcgis软件绘制成悬浮泥沙空间分布图，并归纳出长江口悬沙分布和输移的基本规律．

Research on Suspended Sediment Concentration in Yangtze River Esturary with TM Image

In recent years, due to water conservancy projects, the Yangtze River runoff varies considerably and the sediment concentration drops dramatically, which certainly affects the environment of coastal zone. Using remote sensing technology to study the sediment concentration is not only fast, efficient, and of short cycle; but also is meaningful to the analysis of coastal estuary silting and scouring variation, and to the study of material flux, material circulation, and estuary shoal transformation of the river basin, port construction, channel regulation, and costal zone management. Employing the Yangtze River estuary thematic mapper （TM） image data and the surface suspended sediment data collected through field sampling, a remote sensing quantitative inversion model for suspended sediment concentration is built. Via pretreating the remote sensing data, the suspended sediment qt~antitative remote sensing different models are adopted to the concentration in2 version on south branch of the Yangtze River estuary surface suspended sediment. Meanwhile, the Environ- ment for Visualizing Images（ENVI） is applied to draw up the spatial distribution of suspended sediment, and to summarize the basic distribution and transport rule.~ nf V~,,,,r,,~ ~;