| 三峡坝区河谷深槽地貌特征及其成因 |
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| 引用本文： | 李徐生,杨达源,柯贤坤,ZHOU Lufu,CHEN Deji,YANG Tianmin,XUE Guofu.三峡坝区河谷深槽地貌特征及其成因[J].地理学报(英文版),2003,13(4):507-512. |
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| 作者姓名： | 李徐生 杨达源 柯贤坤 ZHOU Lufu CHEN Deji YANG Tianmin XUE Guofu |
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| 作者单位： | [1]Dept.ofUrbanandResourcesSciences,NanjingUniversity,Nanjing210093,China [2]ExplorationBureau,ChangjiangWaterResourcesCommittee,Wuhan430010,China |
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| 基金项目： | Exploration Corporation of the Three Gorges Project,The“985 project”construction project of physical geography for Nanjing University |
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| 摘 要： | This paper describes valley bottom troughs of the Changjiang River and infers the geomorphologic development of troughs. Based on the morphology of the troughs, the following conclusions are drawn. (1) The deep troughs on the Three Gorges valley bottom are formed by river downcutting along the structural zones on the background of regional tectonic uplift at about 40-30 ka BP. (2) When river downcutting occurred in the river bed of Changjiang, the jets current (particularly eddy current) with a large number of pebbles ground and eroded the valley bottom, resulting in trough formation and deepening. Meanwhile, water currents with gravels and pebbles eroded the bank and the left wall of No.76 trough as well as the right wall of No.77 trough by striking, scouring, horizontal and vertical grinding. (3) The depth of the trough is mainly determined by the intensity of the water current and the consistency of bedrock against erosion, and is not controlled hv the altihlde of the sea level as the base level of erosion.
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| 关 键 词： | 地形特征 谷底河槽 河床 三峡工程 坝址 |
| 收稿时间： | 9 October 2002 |
| 修稿时间： | 17 April 2003 |
Geomorphologic characteristics and origin of the valley bottom troughs at the site of Three Gorges Dam |
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| LI Xusheng,YANG Dayuan,KE Xiankun,ZHOU Lufu,CHEN Deji,YANG Tianmin,XUE Guofu.Geomorphologic characteristics and origin of the valley bottom troughs at the site of Three Gorges Dam[J].Journal of Geographical Sciences,2003,13(4):507-512. |
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| Authors: | LI Xusheng YANG Dayuan KE Xiankun ZHOU Lufu CHEN Deji YANG Tianmin XUE Guofu |
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| Affiliation: | 1. Dept. of Urban and Resources Sciences,Nanjing University,Nanjing 210093,China
2. Exploration Bureau,Changjiang Water Resources Committee,Wuhan 430010,China |
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| Abstract: | This paper describes valley bottom troughs of the Changjiang River and infers the geomorphologic development of troughs. Based on the morphology of the troughs, the following conclusions are drawn. (1) The deep troughs on the Three Gorges valley bottom are formed by river downcutting along the structural zones on the background of regional tectonic uplift at about 40-30 ka BP. (2) When river downcutting occurred in the river bed of Changjiang, the jets current (particularly eddy current) with a large number of pebbles ground and eroded the valley bottom, resulting in trough formation and deepening. Meanwhile, water currents with gravels and pebbles eroded the bank and the left wall of No.76 trough as well as the right wall of No.77 trough by striking, scouring, horizontal and vertical grinding. (3) The depth of the trough is mainly determined by the intensity of the water current and the consistency of bedrock against erosion, and is not controlled by the altitude of the sea level as the base level of erosion. |
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| Keywords: | valley bottom trough geomorphologic characteristic of valley bottom the Three Gorges |
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