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Japan Tsunami Current Flows Observed by HF Radars on Two Continents

wenjie99 添加于 2011/8/19 10:03:22  1324次阅读 | 0次推荐 | 0个评论

Quantitative real-time observations of a tsunami have been limited to deep-water, pressure-sensor observations of changes in the sea surface elevation and observations of sea level fluctuations at the coast, which are essentially point measurements. Constrained by these data, models have been used for predictions and warning of the arrival of a tsunami, but to date no detailed verification of flow patterns nor area measurements have been possible. Here we present unique HF-radar area observations of the tsunami signal seen in current velocities as the wave train approaches the coast. Networks of coastal HF-radars are now routinely observing surface currents in many countries and we report clear results from five HF radar sites spanning a distance of 8,200 km on two continents following the magnitude 9.0 earthquake off Sendai, Japan, on 11 March 2011. We confirm the tsunami signal with three different methodologies and compare the currents observed with coastal sea level fluctuations at tide gauges. The distance offshore at which the tsunami can be detected, and hence the warning time provided, depends on the bathymetry: the wider the shallow continental shelf, the greater this time. Data from these and other radars around the Pacific rim can be used to further develop radar as an important tool to aid in tsunami observation and warning as well as post-processing comparisons between observation and model predictions.

作 者:Belinda Lipa, Donald Barrick, Sei-Ichi Saitoh, Yoichi Ishikawa, Toshiyuki Awaji, John Largier and Newell Garfield
期刊名称: Remote Sens.
期卷页: 3 August 2011 第3卷 第8期 页
学科领域:数理科学 » 物理学 » 基础物理学
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原文链接:http://www.mdpi.com/2072-4292/3/8/1663/
DOI: 10.3390/rs3081663
ISBN:
关键词: radar oceanography; remote sensing; current velocity measurement
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