长江河口悬浮泥沙向浙闽沿岸输运近期变化的遥感分析

发布时间：2018-04-13 13:24

本文选题：中等分辨率成像光谱仪(MODIS) + 反演模型　；参考：《海洋科学》2017年03期

【摘要】：利用2000~2015年Terra-MODIS(terra-moderate resolution imaging spectroradiometer,中等分辨率成像光谱仪)数据和2014年洪枯季现场数据建立泥沙反演模型,分析入长江河口泥沙大幅减少后河口表层悬沙向浙闽沿岸输运的时空变化和扩散形态。结果表明:(1)利用MODIS数据的二次型模型能够揭示长江口及邻近海域悬沙分布及输运特征,入海输运的长江口悬浮泥沙是浙闽沿岸连续悬浮泥沙带存在的物源;(2)受季风和沿岸流动力驱动,长江口悬沙向浙闽沿岸输运具有明显的季节性:春季,悬浮泥沙从长江口向浙闽沿岸呈条带状输运,春夏之交,南下的悬沙至温岭近岸海域出现中断现象;夏季,长江口大量悬沙滞留在长江口杭州湾近岸,仅有少量悬沙向南输运,泥沙带中断;秋季,10月下旬—11月中旬逐渐形成连续的近岸泥沙带;历冬至春,循环复始;(3)受近年来长江流域进入河口的泥沙减少影响,浙闽沿岸秋冬季连续的输沙带在春季提前断开,在秋季有推迟恢复的现象。本研究对于探究浙闽沿岸泥沙减少新格局,分析近海生态环境新变化具有重要意义。
[Abstract]:The sediment inversion model is established by using Terra-MODIS(terra-moderate resolution imaging spectroradioradiometer (medium resolution imaging spectrometer) data from 2000 to 2015 and field data during the flood and dry season of 2014.The temporal and spatial changes and diffusion patterns of transport of suspended sediment from the estuary to the coast of Zhejiang and Fujian are analyzed after the sediment reduction in the estuary of the Yangtze River.The results show that the quadratic model of MODIS data can reveal the distribution and transport characteristics of suspended sediment in the Changjiang Estuary and its adjacent waters.The suspended sediment in the Changjiang Estuary transported into the sea is the material source of the continuous suspended sediment belt along the coast of Zhejiang and Fujian, which is driven by the monsoon and the coastal flow force. The suspended sediment transport from the Changjiang Estuary to the coast of Zhejiang and Fujian has obvious seasonality: in spring, the suspended sediment in the Changjiang Estuary is transported to the coast of Zhejiang and Fujian.Suspended sediment was transported along the coast of Zhejiang and Fujian from the Changjiang Estuary to the coast of Zhejiang and Fujian. In the spring and summer, the suspended sediment from the south to the coastal area of Wenling was interrupted, and in summer, a large number of suspended sediment remained in the near shore of Hangzhou Bay in the Changjiang Estuary, only a small amount of suspended sediment was transported southward.The sediment belt is interrupted; in autumn, a continuous nearshore sediment belt is gradually formed from late October to mid-November; and in the spring of the Winter Solstice, the cycle begins again and again.) the sediment in the Yangtze River basin entering the estuary decreases in recent years.The successive belt of sediment transport along the coast of Zhejiang and Fujian was disconnected in spring and delayed recovery in autumn.This study is of great significance for exploring the new pattern of sediment reduction along the coast of Zhejiang and Fujian and for analyzing the new changes of coastal ecological environment.
【作者单位】：华东师范大学河口海岸学国家重点实验室;
【基金】：国家自然科学基金项目(41271547,41401644) 中国科学院战略性先导科技专项(XDA05010400)~~
【分类号】：P715.7;P736.21

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