Abstract
This paper proposes an innovative buried wireless sensor network (B-WSN) system for detecting leakage from pipeline joints caused by large ground movements such as earthquakes. The key challenge to any such system is that electromagnetic (EM) signal strength becomes significantly attenuated over short distances when wireless devices are buried in certain materials—notably soil, this paper’s focus. After simulation results indicated that the EM radio frequency was a key factor influencing the depth through which a signal can propagate in soil, the B-WSN system was developed, which includes a high-performance sub-1-GHz transceiver that utilizes a low-power band frequency at 433 MHz. Field testing indicated that the BWSN can achieve a penetration depth of 2.13 m. The system configuration includes a radio link budget of 120 dB, transmit power of 26 dBm, receive sensitivity of , and omnidirectional antenna gain of 1.5 dBi. The system works on multihop topology, meaning that each sensing node also acts as a relay node to assist other nodes buried deeper in the ground with data communication. For purposes of this paper, four hops were used, and this made wireless communication possible at an overall burial depth of 8 m. As such, the proposed B-WSN system would be compatible with most buried utility pipelines. The conducted full-scale pipeline-rupture experiment results further verified that the system can, in close to real time, pinpoint locations and subsequent patterns of water leakage caused by severe ground deformation. The findings also exemplify how the B-WSN system could aid structural evaluation of pipelines that are likely to experience large ground deformation. The average packet-loss rate was less than 0.1% during the experiment, and in terms of average power consumption, each sensing node used less than 26.5 mA per 30 s data-reporting period. Thus, the sensing nodes can be expected to function continuously for 27 days if powered by four standard industrial D-cell batteries, or for more than 2 years if the data-reporting period is changed to 1 h.
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Acknowledgments
The authors would like to thank the Ministry of Science and Technology of the Republic of China, Taiwan, and Sinotech Engineering Consultants for financially supporting (ID: 105-2917-I-564 -053) this research. The authors are also grateful to Cornell University for supporting the Large-Scale Lifelines Testing Facility, and to Jitong Sun, Xiaoyan Huang, and Fei Du for their site work and technical support for B-WSN.
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Information & Authors
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 10 • Issue 4 • November 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Mar 16, 2018
Accepted: Jan 7, 2019
Published online: Jun 22, 2019
Published in print: Nov 1, 2019
Discussion open until: Nov 22, 2019
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