摘要
在岩性构成复杂的岷江龙门山河段,河谷两侧龙门山山顶面主要坡折点与岩性界线基本对应,但河床剖面上没有表现出明显的与岩石抗蚀界限相对应的阶梯状变化。研究结果表明,龙门山地区线状剥蚀速率是面状剥蚀速率的2.1倍,河床表面因岩性差异形成的原始地貌陡坎被水流剥蚀殆尽,从而导致该区域河床剖面样式与山顶面剖面样式存在显著差异。
The Minjiang valley in the Longmen Mountains is composed of complicated lithologic units. Slope break points on either bank of the valley corresponds with lithologic boundary, but there is no appearance of correspondence of erosion resistance boundary of rocks with slope terrace change in river bed section. The study indicates that the linear denudation rate in the Longmen Mountains is 2.1 times as much the sheet denudation rate which results in obvious difference between river bed section style and valley section style.
出处
《四川地质学报》
2014年第2期187-189,共3页
Acta Geologica Sichuan
基金
国家自然科学基金资助项目(40372084
40972083
41172162)
关键词
岩性差异
剖面样式
岷江
龙门山
lithologic difference
section style
Minjiang River
Longmen Mountains
