United States Department of Transportation
i
CORS 911: Continuously Operating Reference Stations for the Bayou Corne Sinkhole
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2019-09-01
[PDF-2.15 MB]
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Edition:Final Report, 2013
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Abstract:The sinkhole associated with the Napoleonville salt dome in Assumption Parish, Louisiana, near Bayou Corne, threatened the stability of Highway 70–a state-maintained route. In order to mitigate any potential damaging effects to the highway and address issues of public safety, a program of monitoring, decision support, and research was implemented to provide continuous, long-term observation and measurements of the surface stability using continuously operating GPS reference stations (CORS). Five CORS911 Sentinel sites were installed in the vicinity of the sinkhole to measure the horizontal and vertical displacements of each site relative to each other and to a fixed location outside the study area. Differential motions measured by integrity monitoring software were automatically summarized within a report and uploaded to an FTP server on a daily basis. An email system was also implemented to notify decision makers of anomalous movements measured by the CORS911 sentinels. This report presents the positional measurements collected and discusses the implementation experience and findings. DOTD reduced the threat level from emergency to monitoring, and then to closed this project at the end of September 2018. The CORS stations will be recommissioned to other areas of the state by DOTD (location and survey).
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