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《Earth and Environment》 2013-01
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Discharge Estimation of the Yangtze River's Paleovalley near the No.4 Nanjing Yangtze River Bridge in the Last Glacial Maximum

CUAN Jing-bo1,2,CAO Guang-jie1(1.College of Resources and Environment,Linyi University,Shandong Linyin 276000,China; 2.College of Population,Resources and Environment.Shandong Normal University,Jinan 250014,China)  
Using 39 geological engineering drilling data and other available data for the No.4 Nanjing Yangtze River Bridge,we can see that the paleovalley is dated to LGM at a depth of-60~-90 m near the No.4 Nanjing Yangtze River Bridge.According to the paleovalley section,shape parameters,particle size grading of sediments in the incised-valley and so on,the cross section area and average velocity of the LGM were calculated by such ways as the hydraulic geometry method,the sediment particle size-hydraulics method and the geomorphology-hydraulics method.At the end,the discharge in the No.4 Nanjing Yangtze River Bridge near the Yangtze River during the LGM has been estimated to be around 22 000~27 000 m3/s.Moreover,the ancient Yangtze River near the No.4 Nanjing Yangtze River Bridge in the LGM was a meander river according to the width-depth ratio,suspended sediment concentrations,and channel curvature.
【Fund】: 国家自然科学基金(40871010 41072138);; 山东省自然科学基金(ZR2012DL02 ZR2010DM002)资助
【CateGory Index】: P333
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