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Flood Disaster Mitigation measures using The Things Network and Low Earth Orbit by Wakayama University

Wakayama University's Disaster Science and Resilience Co-creation Center collects inexpensive disaster prevention/mitigation information using LoRaWAN (The Things Network) as an initiative of the Large-scale Sediment Disaster Research and Development Organization based on a collaboration agreement with the Kinki Regional Development Bureau. I have been developing the system.

This time, we received a strong request from Reiko Mori Wakayama Prefectural Assembly Vice-Chairman and Wakayama City Nishiyama East District Association. With the approval of Wakayama Prefecture and Wakayama City, we will install three water level gauges.

*Figure1: LoRaWAN IoT system Receiving not only on the ground but also via Low Earth Orbit Satelites

As for data base stations, we use the base stations installed at Wakayama Shinai Women's Junior College, where we are conducting joint research.

LoRaWAN is a type of so-called LPWAN (Low-Power Wide-Area Network) (a wireless communication method that covers a wide area with low power consumption), and has started to be used in Japan after it has received technical certification. With LoRaWAN, the output of 100mW (power that can be output for more than half a year with data transmission once every 10 minutes with two AA batteries) for several kilometers on the ground surface and up to low-orbit satellite orbits (several hundred kilometers) Yes (Figure 1).

At Wakayama University, as part of the efforts of the Large-scale Landslide Disaster Countermeasures Research and Development Organization, in cooperation with the Kinki Regional Development Bureau Kii Mountain Sabo Office, research and development on a system for collecting disaster prevention/mitigation information using this communication method from 2014 In the Kiihira and Kachiura areas of the Kii Peninsula.

Also, from August 11, last year, a water level gauge using LoRaWAN was installed in Saikawa flowing through the area at the request of the voluntary disaster prevention association in Maruyama Ward, Gobo City. With the cooperation of Hotel Green Hill in front of Gobo Station, we have installed and operated a receiver (Figure. 3).

*Figure3: Flooding Sensor at Gobo City

Reiko Mori Wakayama Prefectural Assembly Vice-Chairman requested the installation of multiple water level gauges on the Wada River and Maeshiro River by the Joint Residents Association in the Nishiyama-Higashi area, where there are particular concerns about inland water disasters. We decided to carry out a demonstration experiment as a self-help/co-assistance type water level gauge system that seems to be.

The installation cost is as low as several hundred thousand yen or less, and the operation cost is almost free (only the cost of sending short mail data using the internet line of Wakayama Shinai Women's Junior College). In addition, it is thought that it can operate without maintenance for several years due to the built-in solar cell.

*Low Earth Orbit Relay by Lacuna Space at Wakayama Shinai Women's Junior College

Although similar efforts have begun nationwide, there are many issues such as the cost of installation (several hundreds of thousands of yen in this system) and how to apply for installation. Therefore, as a precedent case, we are proceeding with the installation operation with the cooperation of Wakayama Prefecture and Wakayama City as a precedent case, and we plan to introduce it as a model case to all over the country in the future.

In addition, Wakayama University will cooperate with Wakayama Shinai Women's Junior College to carry out joint research on self-help/co-assistance type disaster prevention/disaster mitigation activities using water level meters installed by residents.

In the Nishiyama-Higashi area, we plan to install a water level gauge near the Maeshiro River (Wada River confluence area) and the Yoshifuda drainage pump station. The water level data can be viewed by local residents on the website, etc. Also, if the water level exceeds the warning water level set by the residents, you can be notified via LINE or email.

You can also visit LoRaWAN in the permanent exhibition room at Wakayama University. Please be in touch with

Wakayama University Disaster Science and Resilience Co-creation Center
TEL 073-457-8505 mobile 090-8177-3076 (faculty member: Akiyama Enryo)
FAX 073-457-8535 e-mail akiyama@wakayama-u.ac.jp

The Things Conference2020参加レポートは、アールエスコンポーネンツ社ユーザーサイト DesignSparkで投稿させていただきました。 ご参考まで。

世界最大のLoRaWANカンファレンス「The Things Conference 2020」レポート(前編)

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