Research on Development Characteristics and Mechanism of the Zhengguangou Debris Flow in Helan Mountain of Ningxia

ZHONG Jiaxin; NI Wankui; HUANG Wei

Northwestern Geology > 2018 > 51(3): 223-231.

ZHONG Jiaxin, NI Wankui, HUANG Wei. Research on Development Characteristics and Mechanism of the Zhengguangou Debris Flow in Helan Mountain of Ningxia[J]. Northwestern Geology, 2018, 51(3): 223-231.

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Research on Development Characteristics and Mechanism of the Zhengguangou Debris Flow in Helan Mountain of Ningxia

1. School of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China;
2. Ningxia Institute of Survey and Monitoring of Land and Resources, Yinchuan 750002, Ningxia, China

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Received Date: January 29, 2018
Revised Date: March 30, 2018
Available Online: July 28, 2022
Published Date: September 04, 2018

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Abstract

Basing on the field exploration and laboratory experiment on the Zhengguangou debris flow in Helan mountain of Ningxia, the geo-environmental background of the debris flow formation has been summarized in this paper, the terrain trigger condition and run-off generation and accumulation mechanism have been analyzed. On the basis above, the characteristics values of kinematics and dynamics have been calculated, and the risk degree has been assessed further. The result indicates that the Zhengguangou debris flow should be a turbulent debris flow, with the mean density of 1.73 t/m³ and the triggered critical slope of 16°(or tanθ ≥ 0.29). Besides, through the calculation of mean flow velocity (4.08m/s), flow (98.14m³/s), single maximum flow volume (2.38×10⁴m³) and other factors, the Zhengguangou debris flow could be considered as moderately dangerous, with the risk degree of 0.397.
- debris flow,
- development characteristics,
- formation mechanism,
- kinematics,
- risk assessment

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