Gully Distribution and Evolution in East Gansu Province Based on Statistics

Yuan Shuang; Xu Qiang; Zhao Kuanyao; Li Huajin; Wang Xuan; Zhou Qi

doi:10.13961/j.cnki.stbctb.20200927.001

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Gully Distribution and Evolution in East Gansu Province Based on Statistics

- Gully Distribution and Evolution in East Gansu Province Based on Statistics
- Bulletin of Soiland Water Conservation Vol. 40, Issue 5, Pages: 172-180(2020)
- 作者机构：
  
  成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川,成都,610059
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20200927.001
  CLC： S157
- Published：2020
- 稿件说明：
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Yuan Shuang, Xu Qiang, Zhao Kuanyao, et al. Gully Distribution and Evolution in East Gansu Province Based on Statistics[J]. Bulletin of Soiland Water Conservation, 2020, 40(5): 172-180.
DOI：

Yuan Shuang, Xu Qiang, Zhao Kuanyao, et al. Gully Distribution and Evolution in East Gansu Province Based on Statistics[J]. Bulletin of Soiland Water Conservation, 2020, 40(5): 172-180. DOI： 10.13961/j.cnki.stbctb.20200927.001.

摘要

[目的] 研究陇东地区沟谷分布的统计学特征，旨在查明黄土高原沟谷演化的宏观规律。[方法] 通过野外工作、前人工作和遥感解译寻找黄土沟谷的分布规律，再基于沟谷分级和沟谷走向数据处理，对沟谷发育规律进行量化参数表达。采取统计学检验和正态分布性质，得到沟谷间的影响关系，并引用安全距离等概念参数，重现和预测地貌演化进程。[结果] ①主沟与支沟呈现近似正交的关系，节理的走向与支沟的走向大致相同，构造对沟谷的发育起一定的控制作用。②4组一级支沟对主沟的正交偏差弧度值数据和2组二级支沟对一级支沟的正交偏差弧度值数据均符合正态分布。③在80%的显著概率下，主沟与一级支沟的夹角不小于69.9°，67.6°，59.9°和68.8°；一级支沟与二级支沟的夹角不小于55.8°和70.5°。[结论] 沟谷发育存在普遍规律，70°可视为沟谷发育夹角的极限值。

Abstract

[Objective] This study determines the statistical characteristics of the distribution of valleys in East Gansu Province in order to ascertain the macroscopic valley evolution in the Loess Plateau.[Methods] Field work

previous data

and remote sensing were combined to determine the distribution of loess gullies in the study region. Then

based on the classification of valleys and gullies using data processing

the expression of parameters was quantified for determining gulch development

performed statistical tests

characterized the normal distribution

and statistical tests and normal distribution properties were used to obtain the influence relationship between valleys

and cited concept parameters (e.g.

safe distance)

to reproduce and predict the geomorphic evolutionary process.[Results] ① There was an almost orthogonal relationship between the main trench and branch trench. The joint trend was roughly the same as that of the branch trench

and the structure controlled the development of the trench. ② The radian value data of the orthogonal deviation between the primary branch and main branch of the four groups

and the secondary branch and primary branch of the two groups all conformed to a normal distribution. ③ At a significant probability of 80%

the included angles between the main trench and first branch trench should be ≥ 69.9°

67.6°

59.9°

and 68.8°. The included angle between the primary and secondary branches was ≥ 55.8° and 70.5°.[Conclusion] There is a universal law in the development of valleys

whereby 70° can be regarded as the limit value of the angle of gully development.

关键词

Keywords

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