Evaluation of the CODAR Tsunami Detection Algorithm and Software

H. Roarty, G. Garcia, Terry Nichols
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Abstract

Coastal hazards pose a threat to human life and property around the globe. Tsunami waves and storm surge are some examples of coastal hazards we must try to mitigate over the coming decades. High Frequency radars have emerged as possible technology capable of mitigating the destruction from these hazards by providing early detection of these disturbances out at sea. Rutgers University has worked with CODAR Ocean Sensors by collecting and analyzing data from four HF radar stations for potential tsunami signals from October 2016 to June 2019. CODAR has developed a pattern recognition process to detect the presence of tsunami waves. The output of the process is quantified as an alongshore and cross shore q-factor. If there is a spike in the q-factor measurement then arrival of a tsunami could be imminent. The statistics of the q-factor measurements at the four stations were calculated and compared against the radio noise spectrum and other environmental data like nearby water level and atmospheric pressure. Recently, on May 30, 2019 a weather system moved through the region that generated a small meteotsunami (amplitude 15-30 cm) that was detected by a DART buoy, water level gauges and one of the HF radar stations. The data from all three system covered a large spatial area which allowed us to study the propagation of the wave through the region. The different detection schemes with each technology also allowed us to study the characteristics of the tsunami signal.
CODAR海啸探测算法及软件评价
沿海灾害对全球人类生命和财产构成威胁。海啸和风暴潮是我们必须在未来几十年努力减轻的沿海灾害的一些例子。高频雷达已经成为一种可能的技术,能够通过在海上提供这些干扰的早期检测来减轻这些危害的破坏。罗格斯大学与CODAR海洋传感器合作,从2016年10月至2019年6月收集和分析来自四个高频雷达站的潜在海啸信号数据。CODAR开发了一种模式识别程序来探测海啸波的存在。该过程的输出被量化为沿岸和跨岸的q因子。如果q因子测量值出现峰值,那么海啸可能即将到来。计算了四个站点的q因子测量统计数据,并将其与无线电噪声频谱和附近水位和大气压力等其他环境数据进行了比较。最近,2019年5月30日,一个天气系统经过该地区,产生了一次小型海啸(振幅15-30厘米),由DART浮标、水位计和一个高频雷达站检测到。这三个系统的数据覆盖了一个很大的空间区域,这使我们能够研究波在该区域的传播。每种技术的不同探测方案也使我们能够研究海啸信号的特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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