地理科学 ›› 1988, Vol. 8 ›› Issue (4): 323-329,395.doi: 10.13249/j.cnki.sgs.1988.04.323

• 论文 • 上一篇    下一篇

黄土梁峁地区影响黄土侵蚀的地貌条件分析

陈渭南   

  1. 中国科学院兰州沙漠研究所
  • 出版日期:1988-07-20 发布日期:1988-07-20

STATISTICAL ANALYSIS OF GEOMORPHIC CONDITIONS EFFECTING LOESS EROSION IN LOESS LIANG-MAO HILLY-GULIED REGION

Chen Weinan   

  1. Institue of Desert Research, Academia Sinica, Lanzhou
  • Online:1988-07-20 Published:1988-07-20

摘要: 本文以无定河流域黄土丘陵地区为例,应用数量地貌学方法,提出"地貌曝露面"的概念,分析论证影响黄土侵蚀的地貌条件及其相互制约关系.结果表明,地貌要素之间除沟谷密度和坡长表现为负对数关系外,其余均为幂函数关系.沟谷密度、坡长与地貌曝露面间为线性相关;坡度与地貌曝露面间为幂函数关系.用文中模型可预测侵蚀强度.

Abstract: By using quantitative geomorphical method and taking the Wuding River basin as an example,this paper puts forward the conceptof exposure surface of landform,which represents the possible erosive area in a region,and deals with the geomorphic conditions effecting loess erosion.The relations between each pair of morphological parameters are as follows: D=12.89H0.69 r=0.77 D=0.374A0.778 r=0.94 D=-4.061gL-2.13 r=-0.9 H=0.014A0.85 r=0.92 Sp=0.9+0.85L r=0.83 Sp=0.559A0.66 r=0.94 where D is gully-valley density (km/km2),H is relative height (km),L is length of slope (km),A is average angle of slope and Sp is potential expos-ure surface of landform (km2/km2).Most of them are significant at 0.01 level.The author thinks that the models can be used to predict the intensi-ty of loess erosion. M=3046.45+73.23H r=0.83 M=27.54Sp1.27 r=0.98 where M is the soil erosion modulus (T/km2·yr).