| 试论长江三峡河段深槽的成因 |
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| 引用本文： | 杨达源,赖莲英.试论长江三峡河段深槽的成因[J].山地学报,1992(3). |
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| 作者姓名： | 杨达源 赖莲英 |
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| 作者单位： | 南京大学大地海洋科学系
(杨达源),南京大学大地海洋科学系(赖莲英) |
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| 摘 要： | 长江三峡河段共有近90个深槽,累计长度占河段总长的45％左右。它们分布在由多种原因造成的河槽束狭部位的下方、水下岩埂的下方、狭谷急流奔泄及河道拐折处,槽底基岩岩性相对较软弱的地段。它们是在三峡地区构造抬升、流水强烈深切过程中主要由跌水掏蚀与急流冲蚀所形成的,其深度不受海面高度的限制。
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| 关 键 词： | 长江三峡 流水深切 深槽 |
STUDY ON THE ORIGIN OF THE DEEP TROUGHS AT THE THREE GORGES REACHES OF THE CHANGJIANG RIVER |
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| Yang Dayuan Lai Lianying.STUDY ON THE ORIGIN OF THE DEEP TROUGHS AT THE THREE GORGES REACHES OF THE CHANGJIANG RIVER[J].Journal of Mountain Research,1992(3). |
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| Authors: | Yang Dayuan Lai Lianying |
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| Abstract: | The reaches of the Changjiang River between Baidicheng.Fengjie,Sichuan and Nan-jinguan, Yichang,Hubei,called the Three Geoges reaches,are about 200 km. There are approach 90 deep troughs in the reaches,of which progressive length is 45% of total one of the reaches.Most of the deep troughs are situated behind the rock beams,rock projectings,rock beachs and rock reefs which are made up of the solik rocks,for example",the thick bedded quartz sandstone,the thick bedded limestone and the massive crystalline. Some deep troughs are situated behind the gravelly fan of the rivulet mouth and the rockfall deposits. And most of the deep troughs are characterized by what the upper slope is more steep than the lower slope.The deep troughs in the Three Gorges reaches are developed on the basis of regional tectonic uplift and difference in antierosin intensity of rock formations, and they are formed by scouring,down-cutting and excavation of chute stream and falling water on the places outcropping weak interbeds. |
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| Keywords: | the Three Gorges of the Changjiang River down-cutting deep troughs |
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