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Successful Early Warning of Shuiyinpan Landslide in Puge County, Sichuan​


1. Site Overview

Location: Huashan Township, Hongxing Village Group 2 (Coordinates: 102°35′25″E, 27°25′20″N)
Monitoring Personnel: Liu Hong (Contact: +86 130 8925 4172)

At-Risk Population: 16 households (90 residents)
Monitoring System:

  • 2 wire extensometers

  • 1 rainfall monitoring station

  • 1 early warning broadcast system

2. Incident Timeline

June 9-10, 2020 Extreme Rainfall Event

Time Event Description
22:05 Light rain began
22:40 Rainfall intensified to heavy storm
22:50 Rainfall station triggered yellow alert; broadcast system activated
23:20 Red alert activated; monitoring officer initiated door-to-door notifications
23:37 Extensometer #2 detected deformation
23:55 Extensometer yellow alert triggered
00:10 (June 10) Red alert activated; evacuation warning broadcasted
00:50 Rainfall ceased (Total accumulation: 140.2mm)

Key Outcomes:

  • 80-minute advance warning achieved

  • 100% at-risk population received alerts

  • Zero casualties or property damage

3. System Performance

Post-event Equipment Status:

landslide morning    landslide monitoring

  • Rainfall station: Fully operational

  • Extensometer #1: Normal operation

  • Extensometer #2: Sensor damaged by landslide (replaced)

  • Broadcast system: Continuous alert transmission confirmed

4. Landslide Characteristics

landslide rainfall monitor


landslide rainfall monitor1

From the above hourly rainfall bar chart and minute rainfall bar chart, it can be clearly seen that this rainfall began at 22:05 on June 9, 2020, and lasted until the early morning of June 10, 2020. The entire process saw continuous rainfall of over 140mm, with the rainfall reaching 140.2mm from 22:30 on June 9, 2020 to 00:50 on June 10, 2020.


landslide rainfall monitor2

As can be seen from the above figure, the crack underwent a sharp change before the landslide occurred. It roughly started at 23:37 on June 9, 2020, and lasted until the moment of the landslide (around 00:10 on June 10). The deformation duration was about 30 minutes, and the deformation rate was as high as 288mm/d. Moreover, the time of its occurrence has a strong correlation with the period before and after the formation of this rainfall.

5. Verification & Analysis

Field Observations:

  • Secondary landslide risk identified (requires further assessment)

  • Extensometer #2 damage confirmed due to anchor point displacement

Monitoring Data Correlation:

  • Complete data chain from rainfall → deformation → failure

  • Precise temporal alignment between:
    a) Rainfall intensity peaks
    b) Crack development
    c) Alert triggers

6. Conclusion

This event demonstrated:

  1. System Effectiveness: Integrated monitoring successfully predicted slope failure 80 minutes in advance

  2. Alert Reliability: Local mesh network ensured real-time warning dissemination

  3. Human Factor: Monitoring officer's proactive response complemented automated systems

  4. Data Quality: Clear precursor signals enabled accurate risk assessment

The Shuiyinpan landslide early warning represents a model case of successful geohazard mitigation through integrated technical systems and community preparedness.


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