末次盛冰期南京长江四桥附近长江古流量估算  

Discharge Estimation of the Yangtze River's Paleovalley near the No.4 Nanjing Yangtze River Bridge in the Last Glacial Maximum

作　　者：爨景波[1,2] 曹光杰[1] 

机构地区：[1]临沂大学资源环境学院,山东临沂276005 [2]山东师范大学人口.资源与环境学院,济南250014

出　　处：《地球与环境》2013年第1期50-55,共6页Earth and Environment

基　　金：国家自然科学基金(40871010;41072138);山东省自然科学基金(ZR2012DL02;ZR2010DM002)资助

摘　　要：利用南京长江四桥的39个地质工程钻孔资料及其它现有资料,已知长江四桥附近约-65～-90m的深槽为末次盛冰期时的长江河槽。根据古河槽断面、形态参数、底部沉积物颗粒级配等,运用河相关系法、泥沙粒径水力学法、地貌水力学法,计算了末次盛冰期时的断面面积、断面平均流速。计算得到末次盛冰期南京长江四桥附近长江古流量约为22000～27000m3/s。初步根据宽深比、悬移质含量、弯曲率等参数值判断末次盛冰期长江四桥附近长江古河型为曲流。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.

关 键 词：末次盛冰期 南京长江四桥附近长江 古流量 古河槽 

分 类 号：P333[天文地球—水文科学]