首页> 外文期刊>Pure and Applied Geophysics >Forecasting Wave Amplitudes after the Arrival of a Tsunami
【24h】

Forecasting Wave Amplitudes after the Arrival of a Tsunami

机译:海啸到来后的波幅预报

获取原文
获取原文并翻译 | 示例
           

摘要

The destructive Pacific Ocean tsunami generated off the east coast of Honshu, Japan, on 11 March 2011 prompted the West Coast and Alaska Tsunami Warning Center (WCATWC) to issue a tsunami warning and advisory for the coastal regions of Alaska, British Columbia, Washington, Oregon, and California. Estimating the length of time the warning or advisory would remain in effect proved difficult. To address this problem, the WCATWC developed a technique to estimate the amplitude decay of a tsunami recorded at tide stations within the Warning Center's Area of Responsibly (AOR). At many sites along the West Coast of North America, the tsunami wave amplitudes will decay exponentially following the arrival of the maximum wave (MOFJELD et al., Nat Hazards 22:71-89, 2000). To estimate the time it will take before wave amplitudes drop to safe levels, the real-time tide gauge data are filtered to remove the effects of tidal variations. The analytic envelope is computed and a 2 h sequence of amplitude values following the tsunami peak is used to obtain a least squares fit to an exponential function. This yields a decay curve which is then combined with an average West Coast decay function to provide an initial tsunami amplitude-duration forecast. This information may then be provided to emergency managers to assist with response planning.
机译:2011年3月11日,在日本本州东海岸附近发生的破坏性太平洋海啸促使西海岸和阿拉斯加海啸预警中心(WCATWC)向阿拉斯加,不列颠哥伦比亚省,华盛顿州的沿海地区发布了海啸预警和咨询,俄勒冈州和加利福尼亚州。估计警告或建议将持续有效的时间证明很困难。为了解决这个问题,WCATWC开发了一种技术来估计预警中心负责区域(AOR)内潮汐站记录的海啸的振幅衰减。在北美西海岸的许多地点,海啸的波幅会随着最大波的到来而呈指数衰减(MOFJELD等,Nat Hazards 22:71-89,2000)。为了估计在波幅下降到安全水平之前所花费的时间,实时潮汐仪数据被过滤以消除潮汐变化的影响。计算分析包络,并使用跟随海啸峰的2 h振幅值序列来获得与指数函数的最小二乘拟合。这将产生一条衰减曲线,然后将其与西海岸平均衰减函数结合起来,以提供初始的海啸振幅持续时间预测。然后可以将该信息提供给紧急情况管理者以协助响应计划。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号