ComNav's Integrated Monitoring System for Landslide Risk in Zhejiang Lishui

Satellite Image of the Landslide Area

Project Background

The Xia Ge Liao area in Jinshui Village has been identified as a landslide risk zone. Continuous heavy rainfall has increased the soil saturation and weight of the slope, while reducing the shear strength of the soil and rock, leading to decreased slope stability and potential hazards such as landslides and collapses. The project aims to conduct scientific assessment and monitoring of geological disaster risks in the area to ensure the safety of local residents and property.

Project Challenge

• Monitoring landslide risk in areas with unstable soil and frequent heavy rainfall.

• Ensuring continuous and reliable monitoring of multiple disaster points across complex terrain.

• Collecting real-time data and transmitting early warning information under harsh environmental conditions.

Customer Information

Customer: China Geological Environment Monitoring Institute (CGEM)

Official Website: www.cgem.org.cn 

Project Timeline

November 2024 (field trial completed) 

Project Location

Jinshui Village, Lishui City, Zhejiang Province, China 

Equipment Used

• GNSS Receivers (A300, A500)

• MS-SAR1000 Slope Radar

• Crack Meter

• Inclinometer

• Tipping Bucket Rain Gauges

• Soil Moisture Monitoring Instruments

• Intelligent Sound and Light Alarm Devices 

System Design and Monitoring Platform

The landslide monitoring system in Xia Ge Liao, Jinshui Village, Lishui City, consists of three main components: monitoring point sensor systems, a control center, and an automated monitoring and early warning platform. Together, they form a complete loop from data collection and processing to alert issuance, ensuring real-time, all-weather monitoring of landslide risks. The system adopts a multi-source fusion monitoring solution combining GNSS receivers, slope radar, and multiple environmental sensors, enabling high-precision, continuous data acquisition. 

Monitoring Point Sensor System

The monitoring point sensor system in Xia Ge Liao, Jinshui Village, Lishui City, consists of multiple high-precision sensors that provide all-weather monitoring of slope stability. The A300 and A500 GNSS receivers, combined with the MS-SAR1000 slope radar and crackmeters, can obtain real-time Sky-Earth-Ground 3D monitoring data from the monitoring points, allowing analysis of dynamic slope displacement and long-term deformation trends.

✔  Tipping bucket rain gauges record rainfall in real time, providing hydrological data for landslide risk assessment. These gauges monitor rainfall intensity and distribution, allowing for better prediction of potential slope failures due to water infiltration.

✔  Soil moisture monitoring instruments measure water content and temperature at various soil depths. This real-time data is crucial for assessing slope stability, as it helps understand how moisture variations affect soil behavior at different depths, enabling more accurate risk evaluations.

✔  Tiltmeters track slope inclination in real time, detecting any abnormal deformation. These devices are essential for identifying early signs of instability, offering valuable data for assessing the risk of a landslide.

✔ Sound and light alarm devices are linked with the sensors to deliver immediate on-site alerts. In case of abnormal readings, these alarms ensure that personnel receive prompt notifications, enhancing safety measures in the field.

✔ Through multi-source data fusion, the system enables automated real-time monitoring of critical parameters such as slope displacement, soil moisture, and rainfall. This integration provides a comprehensive and solid basis for ongoing risk assessment and decision-making in landslide management.

Automated Monitoring and Early Warning Platform

The automated monitoring and early warning platform is the core of the system, providing information management, data visualization, and intelligent analysis. The platform receives data from GNSS receivers, slope radar, and other sensors in real time, storing, analyzing, and processing it online. Monitoring data is automatically compared against preset thresholds to determine alert levels. When thresholds are exceeded, the platform triggers automated alerts, including sound and light alarms and remote notifications to relevant personnel. Users can access real-time maps, project status, and historical data remotely, supporting multi-user collaborative management. The platform also generates monitoring reports, summarizing the operational status of all monitoring points and alert records, supporting disaster prevention and risk management decision-making.

Data Transmission and Communication

The system uses multiple wireless communication methods, including 4G, NB-IoT, and LoRa, to transmit monitoring data to the control center server in real time, ensuring continuous and reliable information flow. This stable data transmission enables all-weather monitoring and rapid response under unattended conditions, making landslide risk management more efficient and scientific.

Monitoring Network

The monitoring network is arranged around landslide-prone areas, with key monitoring points including GNSS base stations and environmental sensors. These points track slope displacement and stability in real time, transmitting data to a central server for centralized management and unified analysis. 

Deformation Data

Deformation data collected by GNSS receivers, slope radar, and other sensors is displayed in real time on the monitoring platform, showing changes in slope stability. The system can automatically generate alerts when thresholds are exceeded, allowing relevant personnel to take quick intervention measures and reduce potential risks. 

Project Summary

The Lishui Landslide Monitoring Project, implemented by ComNav Technology, provides a reliable real-time monitoring and early warning solution for landslide risks. By combining GNSS receivers, slope radar, and various environmental sensors, the system enhances the ability to predict and prevent landslide hazards, ensuring the safety of local communities and infrastructure. The system supports all-weather, unmanned operation, maintaining stability under extreme weather conditions such as typhoons, heavy rain, and dense fog, providing strong support for rapid response and real-time slope monitoring.

Beyond Lishui, ComNav has also contributed to diverse monitoring projects across various regions in China, including Chongqing, Wuhan, and Shandong. These projects, with their unique environmental and geological conditions, demonstrate the versatility of ComNav’s technology in addressing different monitoring needs. Our GNSS receivers, slope radar, and environmental sensors continue to play a crucial role in supporting the safety and resilience of local communities.

If you have any monitoring needs or inquiries, feel free to reach out to us anytime. We’re always ready to assist!