%0 Journal Article %T 3万年前长江大洪水沉积的初步分析 %T Primary Discussion on the Heavy Floods Sediments Before 30000 Years in the Yangtze River Basin %A 葛兆帅 %A 杨达源 %A 何太蓉 %A 张强 %A 任黎秀 %A 陈可锋 %A GE,Zhaoshuai %A YANG,Dayuan %A HE,Tairong %A ZHANG,Qiang %A REN,Lixiu %A CHEN,Kefeng %J 湖泊科学 %J Journal of Lake Sciences %@ 1003-5427 %V 15 %N Z1 %D 2003 %P 230-234 %K 3万年前;长江;大洪水;沉积;水动力 %K 30000 years ago;the Yangtze River;the large flood;deposits;hydraulic power %X 选择长江三峡出口部位的红花套断面,对现代长江主流线相沉积、泛滥沉积与三万年前的洪水沉积物粒度进行比较,据粒径大于1mm的粗颗粒粒度分析,发现三万年前的大洪水水动力强度可能是近现代大洪水水动力强度的1.5倍左右.据粒径大于80mm的巨砾粒度分析,三万年前的长江大洪水底流水动力可能是近现代大洪水底流水动力强度的1.35倍左右.因此推测三万年前的长江大洪水比近现代洪水大得多. %X The Honghuatao-Gulaobei section located at the exit of the upper stream of the Yangtze River was selected for this study. Comparison of grain size over 1mm of gravels in the first terrace with that of modem Yangtze River bedload and slack-water sediments of modem floods with that of paleofloods show that hydraulic power of the large floods of more than 30000 years ago was 1.5 times stronger than that of modem floods in the Yangtze River. Comparison of grain size over 80mm of gravels in the first terrace with that of modem Yangtze River bedload and slack-water sediments of modem floods with that of paleofloods show that hydraulic power of the large floods of more than 30000 years ago was 1.35 times stronger than that of modem floods in the Yangtze River. It suggests that the magnitude of floods 30000 years ago could be much larger than those of the modem Yangtze River. %R 10.18307/2003.sup28 %U http://www.jlakes.org/ch/reader/view_abstract.aspx %1 JIS Version 3.0.0