长江口悬浮泥沙的MODIS影像遥感监测研究

Remote sensing detection of suspended sediment in the Yangtse River Estuary by MODIS images

通过对遥感监测泥沙原理和MODIS传感器特征的分析,应用不同时间的MODIS影像进行长江口及其附近海域的悬浮泥沙监测。结果表明:(1)长江口及其附近海域悬浮泥沙含量较高,其中杭州湾悬浮泥沙浓度高于长江口;(2)长江口及其附近海域水体中的泥沙由再悬浮形成,且冬季泥沙浓度和范围均大于春季;(3)入海径流与海洋动力是影响河口沿岸及近海水域水体悬浮泥沙含量的主要因素,其中海洋动力的潮流和波浪是主导控制因素。

<Abstrcat>Remote sensing detection of suspended sediment was carried out in the Yangtse River estuary by the utility of MODIS images and analysis of principles of sediment remote sensing detection.The (results) show that:(1) the suspended sediment quantity of the immediate offshore area is higher,thereinto,the suspended sediment concentration of Hangzhou bay is higher than that of the Yangtse river estuary.(2) the suspended sediment in the yangtse river estuary and near shore zone come into being from (resupension),and the density and area of sediment in winter is higher than that in spring;(3) surface runoff and ocean motive are the main factors affecting the suspended sediment concentration of river estuary zone and water area near ocean,and the tide of ocean motive and wave are dominant factors.