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引用本文:葛兆帅,杨达源,何太蓉,张强,任黎秀,陈可锋.3万年前长江大洪水沉积的初步分析.湖泊科学,2003,15(Z1):230-234. DOI:10.18307/2003.sup28
GE Zhaoshuai,YANG Dayuan,HE Tairong,ZHANG Qiang,REN Lixiu,CHEN Kefeng.Primary Discussion on the Heavy Floods Sediments Before 30000 Years in the Yangtze River Basin. J. Lake Sci.2003,15(Z1):230-234. DOI:10.18307/2003.sup28
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3万年前长江大洪水沉积的初步分析
葛兆帅1, 杨达源1, 何太蓉1, 张强2, 任黎秀1, 陈可锋1
1.南京大学城市与资源学系, 南京 210093;2.中国科学院南京地理与湖泊研究所, 南京 210008
摘要:
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.
关键词:  3万年前  长江  大洪水  沉积  水动力
DOI:10.18307/2003.sup28
分类号:
基金项目:中国科学院南京地理与湖泊研究所知识创新工程所长专项基金(S220007)和中国科学院知识创新工程重要方向项目(KZCX3-SW-331)联合资助
Primary Discussion on the Heavy Floods Sediments Before 30000 Years in the Yangtze River Basin
GE Zhaoshuai1, YANG Dayuan1, HE Tairong1, ZHANG Qiang2, REN Lixiu1, CHEN Kefeng1
1.Department of Geography, Nanjing University, Nanjing 210093, P. R. China;2.Nanjing Institute of Geography & Limnology, CAS, Nanjing 210008, P. R. China
Abstract:
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.
Key words:  30000 years ago  the Yangtze River  the large flood  deposits  hydraulic power
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