| Citation: |
ZHOU Liang. 2025. Formation Mechanisms and Mitigation Engineering Design of the Anzigou Debris Flow in Sihe Village, Xiayunling Township, Fangshan District, Beijing. South China Geology, 41(1): 229-239. doi: 10.3969/j.issn.2097-0013.2025.01.019
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Formation Mechanisms and Mitigation Engineering Design of the Anzigou Debris Flow in Sihe Village, Xiayunling Township, Fangshan District, Beijing
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Abstract
From 20:00 on July 29 to 7:00 on August 2, 2023, influenced by the residual circulation of Typhoon Doksuri (No. 5) and the subtropical high-pressure system, Beijing experienced its most intense rainfall in 140 years of instrumental records. The Anzigou debris flow in Xiayunling Township, Fangshan District, Beijing, was severely impacted by the heavy rainfall. Massive amounts of debris rushed out and accumulated in the gully, causing partial destruction of drainage ditches, hollowing out of village road foundations, farmland erosion, and posing threats to local residents' lives and property. Through detailed field investigations of the Anzigou debris flow, employing trench exploration, geophysical exploration, and geotechnical testing, this study identified the fundamental characteristics of the debris flow. Dynamic parameters were calculated, and remote sensing imagery was integrated to comprehensively analyze its formation mechanisms and dynamic characteristics. Ultimately, comprehensive mitigation measures were implemented for the Anzigou debris flow. Results indicate that due to short-duration intense rainfall, significant rainwater infiltration formed surface runoff converging in the gully. Increased soil moisture content elevated pore water pressure and reduced cohesion and internal friction angle of gully deposits, triggering slope surface instability manifesting itself as collapses and landslides that delivered substantial loose material into the channel. Subsequent channel scouring and bank erosion generated additional loose deposits. The dynamic reserves of loose material totaled
78294 m3, with material sources categorized as collapse-slide type (predominant), channel erosion type, slope erosion type, and waste accumulation type. Through parameter calculations of debris flow dynamics, an integrated mitigation strategy as “channel clearance-damaged structure removal-check dams-diversion channels” was adopted, effectively addressing both interception and drainage requirements. -
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References
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ZHOU Liang. 2025. Formation Mechanisms and Mitigation Engineering Design of the Anzigou Debris Flow in Sihe Village, Xiayunling Township, Fangshan District, Beijing. South China Geology, 41(1): 229-239. doi: 10.3969/j.issn.2097-0013.2025.01.019
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Figure 1.
Remote sensing imagery map of the Anzigou debris flow
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Figure 2.
Topographic and geomorphic map of the Anzigou debris flow gully
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Figure 3.
Isohyetal map of the"23·7"extreme precipitation event (July 2023) in Fangshan District, Beijing
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Figure 4.
Prevention and control layout plan of the Anzigou debris flow
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Figure 5.
Check dam layout plan (a) and cross-sectional view (b) for the mitigation engineering design of the Anzigou debris flow
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Figure 6.
Schematic diagram of load combinations for the check dam in the mitigation engineering design of the Anzigou debris flow
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Figure 7.
Detailed design drawing of the diversion channel for the mitigation engineering design of the Anzigou debris flow