长江口外内陆架埋藏古河谷的河型判别方法探讨
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摘要
根据大量高分辨率单道地震和浅地层剖面资料,在长江口外内陆架发现了大量埋藏古河谷,根据埋藏古河谷断面的形态参数,加以公式计算得到古河谷其它特征参数,使用宽深比-曲率和比降-河宽2种河型判别方法分析判别了该古河谷的河型,认为比降-河宽法在该区域河型判别中具有较好的效果,并判别出晚更新世末次盛冰期和冰消期古长江在研究区域以辫状型河道为主。
A lot of high resolution single channel seismic data and sub-bottom profile data show that there are many buried channels in the inner continental shelf out of Yangtze River in the East China Sea.Some characteristic parameters of the profiles were figured out through some formulae based on the configuration parameters of the buried ancient profiles.Two channel pattern discrimination methods of the width-depth ratio curvature and the slope-width were used to distinguish the ancient channels.The analyzed results show that the slope-width provides with better effect and veracity in the channel pattern discrimination.The main channel of ancient Yangtze River was braided river distinguished by the slope-width in the study area in the last Glacial Maximum of the Late Pleistocene.
A lot of high resolution single channel seismic data and sub-bottom profile data show that there are many buried channels in the inner continental shelf out of Yangtze River in the East China Sea.Some characteristic parameters of the profiles were figured out through some formulae based on the configuration parameters of the buried ancient profiles.Two channel pattern discrimination methods of the width-depth ratio curvature and the slope-width were used to distinguish the ancient channels.The analyzed results show that the slope-width provides with better effect and veracity in the channel pattern discrimination.The main channel of ancient Yangtze River was braided river distinguished by the slope-width in the study area in the last Glacial Maximum of the Late Pleistocene.
引文
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[19]许炯心,基于对Leopold-Wolman关系修正的河床河型判别[J].地理学报,2004,59(3):143-148.
[2]叶银灿,冯应俊.东海陆架的古河系发育,东海及其它陆架沉积作用国际学术讨论会论文集[M].北京:海洋出版社,1983.
[3]陈建文.东海某井两类河流相沉积,海洋地质与第四纪地质[J],1991,11(1):45-50.
[4]袁迎如.东海大陆架外部的晚更新世晚期长江河口[J].海洋学报,1992,14(6):87-93.
[5]刘振夏,Beme S.东海陆架的古河道和古三角洲[J].海洋地质与第四纪地质,2000,20(1):11-16.
[6]李广雪.末次冰期东海陆架平原上的长江古河道[J].中国科学D辑地球科学,2004,35(3):284-289.
[7]Leopold L B,Wolman M G.River channel patterns:braided,meandering and straight[P]US GeolSurvy Pro.1957,282-B.
[8]Schumm S A.Sinuosity of alluvial rivers of the great plains[J]Geol.Soc.Amer.Bull,1963,74:1552-1558.
[9]Schumm S A.Fluvial Geomorphology,The historical perpetive,Hsien wen shen[J],River Menchanics,1971,I.
[10]任明达、王乃樑.现代沉积环境概论[M].北京:科学出版社,1981.
[11]钱宁,关于河流分类及成因问题的讨论[J],地理学报,1985,40(1):1-9.
[12]张俊勇,河型研究综述[J].泥沙研究,2005,4:78-83.
[13]倪晋仁、王随继.论顺直河流[J].水利学报,2000,12:15-21.
[14]洪笑天,弯曲河流形成条件的试验研究[J].地理科学,1987,7(1):35-43.
[15]Schumm S A,Khan H R.Experimental study of channel patterns[J]Geol.Soc.Am.Bull 1972,83:1755-1770.
[16]方宗岱,河型分析及其在河道整治上的应用[J].水利学报,1964,(1):1-12.
[17]中科院地理研究所河流组.渭河下游河流地貌[M].北京:科学出版社,1983.
[18]林承坤,河型的划分[J].南京大学学报,1963,(1).
[19]许炯心,基于对Leopold-Wolman关系修正的河床河型判别[J].地理学报,2004,59(3):143-148.
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