Precise Calculation for Characteristic Parameters of Valley-type Debris Flow Using a Methed of Recursive Equivalent Area Substitution

LIU Xingyu; ZHU Lifeng; SUN Jianwei; JIA Xu; LIU Xiangdong; HUANG Honglin; CHENG Xianda; SUN Yake; HU Chaojin; ZHANG Xiaolong

doi:10.12401/j.nwg.2023166

Northwestern Geology > 2024 > 57(3): 272-284. > DOI: 10.12401/j.nwg.2023166

LIU Xingyu，ZHU Lifeng，SUN Jianwei，et al. Precise Calculation for Characteristic Parameters of Valley-type Debris Flow Using a Methed of Recursive Equivalent Area Substitution[J]. Northwestern Geology，2024，57（3）：272−284. doi: 10.12401/j.nwg.2023166

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Precise Calculation for Characteristic Parameters of Valley-type Debris Flow Using a Methed of Recursive Equivalent Area Substitution

1.
Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an 710100, Shaanxi, China
2.
Xi'an Center of China Geological Survey/Geosciences Innovation Center of Northwest China, Xi'an 710119, Shaanxi, China

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Received Date: June 07, 2023
Revised Date: August 21, 2023
Accepted Date: August 22, 2023
Available Online: August 27, 2023

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Abstract

Abstract

In order to solve the problem of key parameters in predicting "valley-type" debris flow at irregular profiles, based on Manning's formula, this paper establishes an approaching mathematical model of "equivalent area substitution method", which completed calculation for the deepest mud level, the flow rate and the threat range. The result is close to reality. This paper select 10 profiles randomly in the affected area by debris flow in western Henan, by this model: ① the deepest mud level was calculated, the flow velocity, and the area size of the cross-flood profiles under the probability of rainfall once in 10 years, and in 20 years, 50 years, in 100 years. ② Moreover, this paper has done some research for the law of evolution with different rain intensity, and quantitatively analyzed the flood discharge capacity of each profile. ③ Combined with the judgment standard of debris flow intensity, the selected areas were classified into extermely high-risk areas, high-risk areas, medium-risk areas, and low-risk areas. Furthermore, the model can not only provide basic parameters for predicting various indicators of debris flow, but also provide scientific basis for preventing and controlling disaster of debris flow. Finally, the results of this research have a certain significance in the refined prevention and control of debris flow.

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References (24)

References

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Precise Calculation for Characteristic Parameters of Valley-type Debris Flow Using a Methed of Recursive Equivalent Area Substitution