Reconstruction of flood events over the last 150 years in the lower reaches of the Changjiang River

查看全文 作　　者：ZHAN [1]Wang;YANG [1]ShouYe;LIU [1]XiaoLi;LI [1]JianWei;CHOI [2]ManSik

机构地区：[1]State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;[2]Division of Earth and Environmental Sciences, Chungnam National University, Daejeon, 305-764, Republic of Korea

出　　处：《Chinese Science Bulletin》索引2010年第55卷第21期,共7页

基　　金：supported by the National Natural Science Foundation of China(40676031 and 40830107) 摘　　要：The reconstruction of paleofloods in the Holocene has become one research highlight for the present global change study.The core sediments from one newly-emerged bar in the lower Changjiang River(Yangtze River)mainstream were collected for grain size and organic elemental measurements,with aim to reconstruct the flood events over the past 150 years.Major grain size parameters such as mean grain size,probability cumulative curve and C-M diagram of the core sediments clearly indicate the flood event deposition.Furthermore,the TOC/TN ratios in the sediments can indicate flood events considering that during the flash floods,strong surface erosion in the upper and lower reaches of the Changjiang River can transport a large amount of undecomposed plant debris and organic components with relatively low C/N ratios into the lower mainstream.Based on 210Pb dating and sedimentary geochemical results,the research profile recorded several large floods happened from 1850 to 1954,which agrees well with the historical documents and hydrological observations.Interesting to note that the flood events since the 1960s cannot be distinctly recognized on the basis of sediment grain size and organic elemental compositions of the profile,which mainly reflects the intensive human activities over the last fifty years,especially condense dam construction,have significantly changed the characters of suspended sediment into the lower mainstream. 关键词：洪水事件长江下游柱状沉积物地球化学测量平均晶粒尺寸概率累积曲线地表侵蚀长江中下游

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Reconstruction of flood events over the last 150 years in the lower reaches of the Changjiang River

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