地理研究 ›› 1998, Vol. 17 ›› Issue (3): 273-278.doi: 10.11821/yj1998030008

• 论文 • 上一篇    下一篇

流域地貌演化的不同阶段沟壑密度与切割深度关系研究

张丽萍, 马志正   

  1. 山西师范大学地理系
  • 收稿日期:1997-06-10 修回日期:1998-06-23 出版日期:1998-09-15 发布日期:1998-09-15
  • 作者简介:张丽萍, 女, 1960年生, 副教授, 1984年毕业于山西师范大学地理系, 留校工作。1990年在陕西师范大学地理系获自然地理硕士学位。现为中科院水土保持研究所博士研究生。已发表学术论文40余篇。

THE RESEARCH ON THE RELATION BETWEEN GULLYDENSITY AND CUTTING DEPTH IN DEFFERENT DRAINAGE LANDFORM EVOLUTION PERIODS

Zhang Liping, Ma Zhizheng   

  1. Department of Geography, Shanxi Normal University, Linfeng 041004
  • Received:1997-06-10 Revised:1998-06-23 Online:1998-09-15 Published:1998-09-15

摘要: 主要探讨了在流域地貌演化的不同阶段,沟壑密度与切割深度的复杂关系,建立了沟壑密度随切割深度变化的理论极值模型及相应阶段的函数,补充了各演化阶段地貌形态要素的定量、定性描述;反之,可用沟壑密度与切割深度的关系推断流域地貌的演化阶段。

关键词: 流域地貌演化阶段, 沟壑密度, 切割深度, 理论极值建模

Abstract: According to the geographical cycle theory, drainage landform evolution process is divied into three periods—young, mature and old period. In defferent evolution periods, the relation between gully density and cutting depth is various. However, it is sure that landforms are the most tattered and gully density reaches the maximum in the later young—early mature period. By presuming that the drainage landform is evoluted into hills in the period, the maths equation of the theoretical maximum of gully density was established, which is D=ctgθhh0maxdh/(hctga+c)2 (1) where:D: gully density;θ: slope;h: cutting depth;c: gully bed average width;h0: cutting depth minimum;hmax: cutting depth maximum On the above presuming base, the maths function on relation between gully density and cutting depth were established for the defferent development periods. The maths function shows that:①in the early young period, the gully density and cutting depth increase at the same time; ②in the later young—early mature preiod, gully density reaches the maximum and it decreases as cutting depth imcreases; ③ in the later mature—old preiod, gully density decreases as cutting depth decreases. Two example calculations demonstrate that the maths equation of the theoretical maximum of gully density may be used in practice. It can infer drainage landform evolution period and predict soil erosion developing tendency. It supplements quantitative anslysis on landforms shape elements with drainage landform evolution in defferent periods.

Key words: drainage landform evolution periods, gully density, cutting depth, the theoretical maximum of gully density

PACS: 

  • P931.6