Tsunami versus Infragravity Surge: Comparison of the Physical Character of Extreme Runup
Tsunami versus Infragravity Surge: Comparison of the Physical Character of Extreme Runup
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DOI：
10.1029/2018gl080594
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发表时间：
2018-12
影响因子：
5.2
通讯作者：
Luis Montoya;P. Lynett
中科院分区：
文献类型：
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作者：
Luis Montoya;P. Lynett
最近对高能亚重力(IG)洪水事件的观察，例如台风海燕期间在菲律宾发生的事件，表明IG浪可能以几分钟的周期打破钻孔接近海岸：这是一个非常像海啸的特征。在世界各地都观察到了高能的IG波，并导致了生命损失和财产损失。在这项研究中，比较了海啸和高能IG波事件的陆流特征。一般来说，每当海啸和高能IG波有类似的上升时，海啸往往比IG产生更大的水流深度和更长的洪水持续时间。然而，IG的流速和弗劳德数较大，这主要是由于井筒捕获。这项研究提供了海啸和IG之间的统计和物理判别，因此在两者都暴露的地区，对陆上运输、沉积和破坏的正确解释是可能的。
Recent observations of energetic infragravity (IG) flooding events, such as those in the Philippines during Typhoon Haiyan, suggest that IG surges may approach the coast as breaking bores with periods of minutes: a very tsunami‐like characteristic. Energetic IG waves have been observed in various locations around the world and have led to loss of lives and damages to property. In this study, a comparison of overland flow characteristics between tsunamis and energetic IG wave events is presented. In general, whenever the tsunamis and energetic IG waves have similar runup, tsunamis tend to generate greater flow depths and longer flood durations than IG. However, flow velocities and Froude number are larger for IG primarily due to bore‐bore capture. This study provides a statistical and physical discriminant between tsunami and IG, such that in areas exposed to both, a proper interpretation of overland transport, deposition, and damage is possible.