Abstract
The increase in heavy rainfall events has contributed to the increase in floods and slope failures. These natural disasters can lead to severe loss of human lives. Monitoring and early warning may be the most promising ways to reduce the damage caused by natural disasters. Low-power wide-area networks (LPWANs) are new and efficient techniques for establishing monitoring methods. In this study, a new type of monitoring system, employing three types of LPWANs, was introduced. Radio wave propagation tests, monitoring data, and the effect of temperature on the inclination data were explained. The radio wave propagation tests were used to determine the proper locations for the gateway (GW) and sensors that comprise the monitoring system. The system was able to successfully collect the measurement data at each observation site. However, errors were still found in the measurement data for several reasons, such as electrical circuit problems, battery problems, and environmental effects. Moreover, an unstable correlation between temperature and the inclination data was observed. Thus, the moving average filter was applied in order to smooth out the fluctuations in the inclination data. Nonetheless, random noise was still present in the inclination data. It was determined, therefore, that only long-term inclination data trends should be used to predict displacement data.
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Acknowledgements
The authors thank the SECOM Science and Technology Foundation, Shikoku Create Association, and The Kurata Grants: The Hitachi Global Foundation. This work has also been supported by Dia Consultant Co., Ltd, Ryoden Corporation, Nishimatsu Construction Co., Ltd, OYO Corporation and Mcot Co., Ltd. The authors also thank Ministry of Land, Infrastructure, Transport and Tourism, Shikoku Regional Development Bureau. Their support is gratefully acknowledged.
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This research project has been partly supported by the SECOM Science and Technology Foundation, Shikoku Create Association, and The Kurata Grants: The Hitachi Global Foundation.
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All the authors contributed to the study conception and design, material preparation, data collection, and data analysis. The first draft of the manuscript was written by Achmad Hafidz and all the authors commented on previous versions of the manuscript. All the authors have read and approved the final manuscript.
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Hafidz, A., Kinoshita, N., Yasuhara, H. et al. Development and applications of slope and river monitoring system using low-power wide-area network technology. J Civil Struct Health Monit 13, 83–100 (2023). https://doi.org/10.1007/s13349-022-00620-1
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DOI: https://doi.org/10.1007/s13349-022-00620-1