| 滇西北三江河谷纵剖面的发育图式与演化规律 |
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| 引用本文： | 蒋忠信.滇西北三江河谷纵剖面的发育图式与演化规律[J].地理学报,1987(1). |
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| 作者姓名： | 蒋忠信 |
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| 作者单位： | 铁道部第二勘测设计院第三总队 |
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| 摘 要： | 在地壳持续、匀速抬升继以长期稳定的构造条件下,均一流域河谷纵剖面形态是以河口或河源为原点的抛物线(h=Al~N)。抬升期,河流深切侵蚀,纵剖面为上凸抛物线型;稳定期,河流均衡调整,纵剖面为下凹抛物线形;其间过渡阶段,纵剖面为直线型。流域地貌随侵蚀循环而相应演化,最终形成准平原。滇西北金沙江、澜沧江、怒江流域接近理想假设条件,其河谷纵剖面的形态和演化符合上述的图式和规律。
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| 关 键 词： | 河谷纵剖面 金沙江 澜沧江 怒江 发育图式 演化规律 |
MODEL OF DEVELOPMENT AND RULE OF EVOLUTION OF THE LONGITUDINAL PROFILES OF THE VALLEY OF THREE RIVERS' IN THE NORTHWESTERN PART OF YUNNAN PROVINCE |
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| Jiang Zhongxin.MODEL OF DEVELOPMENT AND RULE OF EVOLUTION OF THE LONGITUDINAL PROFILES OF THE VALLEY OF THREE RIVERS'' IN THE NORTHWESTERN PART OF YUNNAN PROVINCE[J].Acta Geographica Sinica,1987(1). |
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| Authors: | Jiang Zhongxin |
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| Institution: | The 2nd Railroad Survey and Design Institute |
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| Abstract: | The longitudinal profile of a river valley is morphologically the assemblage of every reach profile in various developing stages and changes in the development and evolution of every reach profile. According to this point of view of time and space, under the condition that the earth crust is under long stabilization after a long and homogeneous speed of uplift, the model diagram of longitudinal profile of the river valley for an idealized drainage with uniform condition is a parabola pattern with the river mouth and the river head as the prime points of the coordinate axis: h = alN.
When the river is in an incised erosive stage, the morphology of its longitudinal profile has. a convex parabola pattern. In a stable stage, the river has a stage of graded adjustment and the morphology of its longitudinal profile is a concave parabola pattern. During the transitional stage between incised erosion and graded adjustment, the longituinal river valley profile isali-nearization. From the beginning of rising to the stage of equilibrium an erosional cycle is formed. The geomorphology of the drainage area developes with the erosional cycle and finally a peneplain is formed.
The tectonic and drainage condition of the three mentioned rivers', lie on the plateau of Northwestern Yunnan, and conform with the above mentioned hypothesis. Therefore, their development and the evolution of the longitudinal profiles obey the diagram and rule. |
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| Keywords: | Valley longitudinal profile Model of development Rule of evolution |
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