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干旱区地理 ›› 1989, Vol. 12 ›› Issue (1): 25-30.doi: 10.13826/j.cnki.cn65-1103/x.1989.01.005

• • 上一篇    下一篇

无定河流域黄土区的侵蚀速率

陈渭南   

  1. 中国科学院兰州沙漠研究所
  • 出版日期:1989-03-25 发布日期:2025-12-25

The Erosional Rates of the Loess Region in the Wudinghe River Catchment

Chen Weinan   

  1. Institute of Desert Research, Academia Sinica, Lanzhou
  • Published:1989-03-25 Online:2025-12-25

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摘要： 本文根据对无定河阶地高差沿程分布的二次相关分析和对黄土沟壑的隔时遥感测量,表明干流自Q22以来平均下切速率为0.37Cm/yr;Q43以来的下切速率为53Cm/yr。黄土沟壑的平均溯源侵蚀速率为1.5m/yr;流域面上的下蚀速率为0.17-2Cm/yr。

关键词: 无定河阶地, 相关分析, 黄土沟壑, 隔时遥感, 侵蚀速率

Abstract: Based on the fieldwork and quadratic analysis about the relative hight of the terraces of the Wudinghe river and the channel length from the terrace Iocation to the head of the river and the time-lapse remote sensing measuring, this paper shows that the rate of the headward erosion is about 1.5 m ．per year in the loess gullies．The downward erosion rate was 0.37 cm./yr. in Q22, and has been being 0.53 cm/yr. since Q34 and about 0.2 cm/yr. since 700 yr. B. P. in main channel and 0.18-2cm./yr. in loes hilly-gullied rigion.