| 长江在三峡库区段实现东流过程探讨 |
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| 引用本文： | 张加桂.长江在三峡库区段实现东流过程探讨[J].地质论评,2006,52(5):656-661. |
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| 作者姓名： | 张加桂 |
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| 作者单位： | 中国地质科学院地质力学研究所,北京,100081;中国地质环境监测院,北京,100081 |
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| 基金项目： | 本文为三峡移民开发局基金项目（编号9707,9904）的成果. |
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| 摘 要： | 三峡如何贯通并实现东流的问题历来是学术界关注和争议的问题。笔者认为，三峡的连通不是简单的江汉平原水系与四川盆地水系的连通，而是包括三峡库区段众多中小盆地及其水系的纵横交织性连通，连通过程中有地表水的溯源侵蚀作用，也有地下水的溶蚀、风化和侵蚀作用。地表水的流路与地下水的流路不尽相同，地下水的作用形成地下河，许多峡谷是地下河经进一步溶蚀垮塌形成的。地表河与地下河相连接构成长江主河道。虽然当时的水流有东西分流，但没有明显的分水岭，许多地段水流的方向因各盆地降雨量的变化而频繁改变。由于河流下切和新构造运动造成地表西升东降，最后流向四川盆地的水改向东流，形成统一的长江。三峡库区段是年轻的河段，成为完全地表河和东流的时间不长。这些认识对深化大江大河的成因理论具有重要的意义。
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| 关 键 词： | 贯通 东流 河流演化 岩溶 三峡 |
| 收稿时间： | 2006-04-26 |
| 修稿时间： | 2006-04-262006-07-11 |
Probing on the Realization Process of Orient Run-through of Yangtze River along Three Gorges Reservoir Sector |
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| ZHANG Jiagui.Probing on the Realization Process of Orient Run-through of Yangtze River along Three Gorges Reservoir Sector[J].Geological Review,2006,52(5):656-661. |
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| Authors: | ZHANG Jiagui |
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| Institution: | 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081;2. China Institute of Geo-Environmental Monitoring, Beijing , 100081 |
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| Abstract: | How to transfix and realize orient run-through on Three Gorges Reservoir sector, Yangtze has been being a focus and disputation problem of academic circle historically. By the author research, the transfixion of Three Gorges Reservoir sector was not a simple one between the water systems of Jianghan plain and Sichuan basin, but a complex interweaving one among the two and many other middle to mini basins around Three Gorges Reservoir sector. The transfixion was achieved not only by retrogressive erosion of surface water, but also by dissolution, weathering and erosion of groundwater. The route of surface water might be different from the one of groundwater, and the underground river was given out by groundwater, whereas the sharp gorge was generated through the top collapse of underground river. The main watercourse of Yangtze was made of some surface river sectors and underground rivers. Though there existed orient and westward discharges, but there was no fixed watershed, and the current orientations among some sub sectors varied frequently cause of variation of rainfall in different basins. Since the down cut of the river and the earth's surface was eastward declined by neotectonic movement, the river to Sichuan basin was eastward deviated and the Yangtze made up. Three Gorges is a young river sector, it is not very long to become entirely surface river and realize orient run-through. Those recognitions will make significance to deepen genetic theory on large river. |
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| Keywords: | transfixion orient run-through river evolution karst Three Gorges |
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