南方崩岗侵蚀区崩壁龛穴发育特征与稳定性初探

何玲; 邓羽松

doi:10.13870/j.cnki.stbcxb.2023.03.008

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南方崩岗侵蚀区崩壁龛穴发育特征与稳定性初探

更新时间：2025-03-12

- 南方崩岗侵蚀区崩壁龛穴发育特征与稳定性初探
- Preliminary Study of the Development and Stability of Niches in Collapsing Wall in Benggang Erosion Areas of Southern China
- 水土保持学报 2023年37卷第3期页码：60-65
- 作者机构：
  
  广西大学林学院,南宁,530004
- 作者简介：
  
  [ "何玲(1999—),女,广西桂林人,硕士研究生,主要从事土壤侵蚀与水土保持研究。E-mail:hl147111@126.com" ]
- 基金信息：
  
  国家自然科学基金项目(42007055);广西自然科学基金项目(2021GXNSFBA075017)
- DOI：10.13870/j.cnki.stbcxb.2023.03.008
  中图分类号： S157.1
- 纸质出版：2023
- 稿件说明：
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何玲, 邓羽松. 南方崩岗侵蚀区崩壁龛穴发育特征与稳定性初探[J]. 水土保持学报, 2023,37(3):60-65.

HE Ling, DENG Yusong. Preliminary Study of the Development and Stability of Niches in Collapsing Wall in Benggang Erosion Areas of Southern China[J]. 2023, 37(3): 60-65.
何玲, 邓羽松. 南方崩岗侵蚀区崩壁龛穴发育特征与稳定性初探[J]. 水土保持学报, 2023,37(3):60-65. DOI： 10.13870/j.cnki.stbcxb.2023.03.008.

HE Ling, DENG Yusong. Preliminary Study of the Development and Stability of Niches in Collapsing Wall in Benggang Erosion Areas of Southern China[J]. 2023, 37(3): 60-65. DOI： 10.13870/j.cnki.stbcxb.2023.03.008.

摘要

南方花岗岩崩岗侵蚀区崩壁常见形似内凹洞的特殊地貌(龛穴)

该地貌的发育可引起崩壁失稳并扩大崩岗侵蚀范围。通过刻画龛穴形态演变过程

研究龛穴发生的物质条件与驱动因素

并结合力矩分析方法构建力学模型评价崩壁及龛穴稳定性。研究表明:龛穴形态演变经历"雏形—发育—形成"3个过程

剖面土层异质性是龛穴发育的基础条件

水力与重力作为外部因素共同作用驱动龛穴发育。龛穴稳定性随其高度增加、角度减小而降低。龛穴的发育可能是崩岗溯源侵蚀启动的标志

遏制龛穴形成有利于提高崩壁稳定性

研究结果为崩岗侵蚀治理提供理论依据。

Abstract

Special features resembling internal hollows (niches-like ephemeral gully head) are common in the collapsing walls of granite Benggang erosion in southern China. This study investigated the material conditions and drivers of niches occurrence by describing the morphological evolution of the niches

and combined with moment analysis methods to construct mechanical models to evaluate the stability of collapsing walls and niches. Studies have shown that niches morphology evolves through three stages of "embryonic-development-formation". Soil heterogeneity in the profile is the underlying condition for niche development

with hydrodynamics and gravity acting together as external factors to drive niche development. The stability of the niche decreases as its height increases and its angle decreases. The development of niches may be a sign of the initiation of headcut erosion of the Benggang

and the containment of niche formation is conducive to improving the stability of the collapsing wall. The results of the study provide a theoretical basis for Benggang erosion management.

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