Sensor Placement Optimization Software Applied to Site-Scale Methane-Emissions Monitoring
Publication: Journal of Environmental Engineering
Volume 146, Issue 7
Abstract
Advances in sensor technology have increased our ability to monitor a wide range of environments. However, even as the cost of sensors decline, only a limited number of sensors can be installed at any given site. The physical placement of sensors, along with the sensor technology and operating conditions, can have a large impact on our ability to adequately monitor environmental change. This paper introduces a new open-source Python package, called Chama, that determines optimal sensor placement and technology to improve a sensor network’s detection capabilities. The methods are demonstrated using site-specific methane emission scenarios that capture uncertainty in wind conditions and emission characteristics. Mixed-integer linear programming formulations are used to determine sensor locations and detection thresholds that maximize detection of the emission scenarios. The optimized sensor networks consistently increase the ability to detect leaks, as compared to sensors placed near each potential emission source or along the perimeter of the site.
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Data Availability Statement
All data, models, and code generated or used during the study are available from the corresponding author by request. Chama can be installed through the Sandia National Laboratories GitHub organization at https://github.com/sandialabs/chama. Software documentation is available at https://chama.readthedocs.io.
Acknowledgments
This work was funded through Sandia National Laboratories’ Laboratory Directed Research and Development (LDRD) program. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc, for the USDOE’s National Nuclear Security Administration under contract DE-NA0003525. This paper describes objective technical results and analysis. Any subjective views or opinions that might be expressed in the paper do not necessarily represent the views of the USDOE or the United States Government.
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Received: Aug 18, 2019
Accepted: Jan 22, 2020
Published online: Apr 24, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 24, 2020
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