In Japan, frequently sediment-related disasters have occurred such as typhoons, torrential rain, landslide, earthquakes, flood, debris flow, etc. To prevent the damage caused by the sediment-related disaster, it is necessary to establish a monitoring system of slope deformation. The system which has been conventionally used, have been using a wired cable to the power supply and data transmission to the equipment. However, the issues of this system are difficult to perform maintenance and monitoring. In this research, the purpose is to develop a slope deformation monitoring system using LPWA (Low Power Wide Area) that can reduce the cost and construction period. It is essential to construct a system that combines wireless technology and inclinometers that can measures movement of slopes and send the information through wireless communication. The data from Inclinometers are collected through the LPWA system. The radio wave propagation has been evaluated around the site. During collecting data from the system, site investigation and experiment has also been conducted to analyze the slope stability. It has been confirmed that the slope monitoring system could detect the slope failure during torrential rain. In the future, developing a monitoring system using LPWA is not only for slope deformation but also in any specific areas such as rock movement, the water level at dam areas, etc.

1. Introduction

In Japan, many landslide disasters occur due to natural disasters such as earthquakes, torrential rains, and typhoons. To prevent damage caused by sediment-related disasters, it is necessary to establish a monitoring system for ground deformation and detect changes in observation events and problems at an early stage (Young, 2013). A simple monitoring method for the precaution of rainfall-induced landslides is proposed, which uses tilt sensors on the slope surface to detect abnormal deformation (Uchimura, 2015). However, the conventional monitoring itself is expensive, because it is necessary to initiate a power cable and a communication cable and construct a sensor with some equipment, and also the monitoring period becomes a problem with regular maintenance which makes the cost increase. In this study, we use LPWA (Low Power Wide Area) as the communication system to send the information. In this study, we aim to develop a slope deformation monitoring system using LPWA that has a data collection function and a sensor function by wireless communication that can reduce the cost and construction period. In this paper, we explain the radio wave propagation experiment to the monitoring site and the results of slope deformation monitoring.

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