| Coast zone, located in the connection belt of sea and land, has been becoming an important area for the international competition and exploitation owing to itself abundant natural resources and predominant geographic location. Silt tidal flat and suspended sediment of case II waters are two important research issues.As a sensitive belt of sea and land interaction, silt tidal flat is characterized as muddy surfaces, densely covered and frequently varied inlets. Therefore, the routine topography survey method has been greatly restrained. In contrast, remote sensing technology provides many prospects for such study, giving an expansive foreground of topography information extraction and quantitative inversion of silt tidal flat, because a number of features of silt tidal flat can be detected by the visible light and near infrared sensors.By means of study of the dynamic sediment and geomorphology characteristics, as well as its information spectra characteristics concerning the silt tidal flat, this dissertation extracted a lot of information in relation to the vegetable, inlet, boundary of tidal flat and water, taking silt tidal flat of Changjiang estuary as researching target. In addition, the Dachan bay of Lingding estuary, some locations at Wenzhou bay and Yueqing bay near Wenzhou together with some locations at Changjiang estuary were taken as further research areas. Their shoreline variations were determined. The gradient and velocity of deposition or erosion were calculated by applying waterside line elevation inversion technology based on multi temporal satellite remote sensing images. These resultant data filled in the data shortage by routine topography survey. It has been found that analysis method used in this dissertation can be applied in the remote sensing quantitative inversion of deposition and erosion in silt tidal flat study.The majority waters along the coast zone and the near sea in China are case II waters. The suspended sediment in these areas is one of the vital water quality parameters. The time and space distribution of suspended sediment is an important parameter in analyzing the variation of deposition and erosion in coast zone, estimating the matter flux from river into sea, and studying the sediment velocity and ocean environment. The obvious movements of coastal line and tidal flat often depends on the intensive variations of sandcontent coming from river.On the basis analyzing the spectra information characteristics of suspended sediment, this dissertation extracted the information concerning current water states along the sea, maximum turbidity, and the front of suspended sediment, taking suspended sediment of Changjiang estuary and Lingding estuary as researching areas. In order to develop the regularity cognition and quantitative study of suspended sediment, a test aimed to simultaneously measure the inherent optical properties and the apparent optical properties has been carried out by utilizing such facilities as the ASD dual channel spectrometer, hydroscat-6 spectral backscattering sensor, and LS-100Q laser scattering particle size analyzer. The specimens came from the surface sediment of tidal flat in Xinmin harbor, Hengsha Island, Changjiang estuary and the sediment of tidal flat top in Xiangshan harbor, Zhejiang province. This dissertation has disposed the reflected spectrum curves corresponding to different suspended sediment waters. Their spectrum characteristics were analyzed. Referred to those accredited suspended sediment inversion models of case II waters domestically and internationally, the author of this dissertation selected remote sensing parameters and established the quantitative analysis statistical mode of suspended sediment. This mode has been successfully used in the suspended sediment inversion of CMODIS images of the space shuttle Shenzhou III and ETM images of Landsat 7. This mode contributed to the remote sensing inversion of quantitative analysis of suspended sediment of case II waters in China.
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