Monitoring sea level change at Cascais tide gauge

Antunes, C., 2011. Monitoring sea level change at Cascais tide gauge. Journal of Coastal Research, SI 64 (Proceedings of the 11th International Coastal Symposium), 870 - 874. Szczecin, Poland, ISSN 0749-0208 Sea level change (SLC) real-time monitoring has being developed and improved for the Portuguese tide gauge, based in FTP access to the internet server of the Portuguese geographical institute. A software application, named MareVB and in development since 2008, gets a 3 minute stream input of sea level height and a 10 minute stream input of air-pressure. Based on a predicted tide model, the sea level height is compared and analyzed, and storm-surge amplitude is determined, as well as the high frequency oscillation (seichas) due to the storm and tsunami waves. Using such real-time SLC data analysis, the application is now running as a coastal hazard warning system, emailing automatic warnings in real-time to national authorities and to other institutions and coworkers, where the levels of coastal hazards of SLC are considered. A post-processing monitoring of SLC is also performed and a time series is evaluated and actualized. Such SLC time series enables the statistics of storm-surges and the determination of the sea level rise rate associated to the global climate change and other regional phenomena. The computational methodology, the application for real-time monitoring and the statistics of storm-surges at Cascais for the period of last 10 years are presented here.