【摘要】 选择 1 995— 2 0 0 0年间NOAA系列卫星AVHRR遥感器获取的珠江口及其邻近海域可见光和近红外遥感数据 ,利用基于海面 遥感器光谱反射率斜率传递现象的悬浮泥沙遥感算法 ,建立珠江口及其邻近海域 1 5 2个时相的悬浮泥沙数据集 ,进行悬浮泥沙浓度分布和变动规律的特征累积频率悬浮泥沙浓度、均值与均方差统计。结果表明 ,珠江口河口浅滩是悬浮泥沙浓度的高值区。随着径流、潮流的相互关系的变动 ,珠江口的悬浮泥沙浓度具有明显的季节变化 ,内伶仃洋悬浮泥沙浓度季节变动幅度最大 ,而磨刀门外浑浊水体的延伸方向变动幅度最大。更多还原

【Abstract】 The algorithm of gradient, a remote sensing algorithm to retrieve suspended sediment concentration from reflectance of NOAA/AVHRR channel 1 (580-690nm) and channel 2 (720-1100nm), removing the atmosphere effect on the basis of the observaion that the gradient for the local correlation curve between such two channels presents a linear response from water leaving to satellite detected records, is successfully applied for the Zhujiang River estuary to derive a suspended sediment concentration data collection. At present 152 resulting images from 1995 to 2000 have been included in this collection. Using this collection analyses of distribution and fluctuation patterns of suspended sediment concentration in the Pearl River estuary and adjacent sea areas is are undertake. The accumulative frequency was used to assess the historic distribution of suspended sediment concentration for each pixel, by picking up the suspended sediment concentration at the accumulate frequency of 5%, 50% and 95%, respectively. The image of suspended sediment concentration at accumulative frequency of 50%, the median of the historic records, is regarded as a tendency reflecting normal situations. The image of suspended sediment concentrations at the accumulative frequency of 5% is considered as the baseline of the historic records, and the image for the suspended sediment concentration at accumulative frequency of 95% reflects the effect of episodic events such as incidence of typhoons. Mean and dispersion deviation were chosen to analyze general views and its variability for such long time series pixel by pixel, with groups covering the whole period or different seasons.更多还原