Discharge Estimation of the Yangtze River’s Paleovalley near the No.4 Nanjing Yangtze River Bridge in the Last Glacial Maximum
详细信息
- 责任者：Cuan Jingbo (College of Resources and Environment ; Linyi University ; Linyin 276000 ; China) ; Cao Guangjie
- 刊名：Earth and Environment
- 出版年：2013
- 卷期：41(1)
- 页码：p.50-55
- issnNo：ISSN1672-9250
- isbnNo：CN52-1139/P
摘要
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.