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基于ITT Visual Information Solutions公司的快速大气校正模块QUAC(Quick Atmosphere Correction),采用静止轨道海洋水色卫星(GOCI)数据实现对杭州湾及其邻近海域高浓度悬浮泥沙含量的快速反演,研究表明:1)经QUAC大气校正后得到的真实地表反射率比值与海洋遥感反射率比值基本一致,表明QUAC是一种适用于高浊度水体且快速简便的大气校正方法;2)悬浮泥沙反演结果显示,杭州湾及其邻近海域的悬浮泥沙含量的日变化主要受潮水作用的影响,月季变化主要受长江冲淡水流量季节、季风以及涌潮等影响,杭州湾北部芦潮港沿岸和庵东沿岸悬浮泥沙长期处于高值,为典型的淤积水域.冬季,苏北浅滩的悬浮泥沙在苏北沿岸流的作用下,可穿过长江口,是杭州湾悬浮泥沙的来源之一.由此可见,GOCI小时分辨率的观测能力使得对杭州湾及其邻近海域悬浮泥沙含量动态变化的准实时观测成为可能.
Based on QUAC (Quick Atmosphere Correction) module of ITT Visual Information Solutions, a rapid retrieval of high suspended sediment concentrations in the Hangzhou Bay and its adjacent waters was achieved by using geocell data from the geostationary orbit. 1) The true surface reflectance ratio obtained by QUAC atmospheric correction is basically the same as that of ocean remote sensing reflectance, indicating that QUAC is a quick and easy atmospheric correction method applicable to high turbidity water bodies; 2) the results of suspended sediment inversion The diurnal variations of suspended sediment content in Hangzhou Bay and its adjacent areas are mainly affected by tidal water. The seasonal variations of the rose are mainly influenced by the seasonal flow of fresh water, the monsoon and the tide of the Yangtze River, Suspended sediment along the coast is at a high level for a long time, and is a typical silt water area. In winter, the suspended sediment in the shallow bank of the North Jiangsu can cross the Yangtze Estuary under the influence of the coast of the North Jiangsu. It is one of the sources of suspended sediment in the Hangzhou Bay. It can be seen that the observation ability of GOCI hourly resolution makes it possible to perform the real-time observation of the dynamic changes of suspended sediment content in the Hangzhou Bay and its adjacent waters.