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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Modeling boulder transport by coastal waves on cliff topography: Case study at Hachijo Island, Japan
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Modeling boulder transport by coastal waves on cliff topography: Case study at Hachijo Island, Japan

机译：通过沿海浪潮在悬崖地形上建模巨石运输：日本八吉岛的案例研究

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Clifftop coastal boulders transported by storm waves or tsunamis have been reported around the world. Although numerical calculation of boulder transport is a strong tool for the identification of tsunami or storm boulders, and for estimation of the wave size emplacing boulders, models which can reasonably solve boulder transport from below a cliff or from a cliff-edge onto a cliff-top do not yet exist. In this study, we developed a new numerical formulation for cliff-top deposition of boulders from the cliff edge or below the cliff, with validation from laboratory tests. We then applied the model using storm and tsunami wave forcing to simulate the observed boulder deposits at the northwest coast of Hachijo Island, Japan. Using the model, the actual distribution of boulders was explained well using a reasonable storm wave height without assumption of anomalously high-water level by storm surge. Results show that boulder transport from the cliff edge or under the cliff onto the cliff-top was possible from a tsunami with periods of 5 similar to 10 min or storm waves with no storm surge. However, the actual distribution of boulders on the cliff was explained only by storm waves, but not by tsunami. Therefore, the boulders distributed at this site are likely of storm wave origin. Our developed model for the boulder transport calculation can be useful for identifying a boulder's origin and can reasonably calculate cliff-top deposition of boulders by tsunami and storm waves. (c) 2019 John Wiley & Sons, Ltd.
机译：世界各地的风暴波或海啸运输的Clifftop沿海巨石。尽管巨石运输的数值计算是识别海啸或风暴巨石的强大工具，以及估计波尺寸的巨石，可以合理地从悬崖下方或从悬崖边缘地运输到悬崖上的模型顶部尚未存在。在这项研究中，我们开发了一种新的数值配方，用于从悬崖边坡或悬崖下方的巨石沉积的悬崖顶部沉积，并从实验室测试中验证。然后，我们使用风暴和海啸波迫使模型应用于日本Hachijo岛西北海岸的观察到的博尔德沉积物。使用该模型，使用合理的风暴波高度来解释巨石的实际分布，而不会通过风暴浪涌假设异常高水位。结果表明，悬崖边缘或悬崖下方的巨石输送到悬崖顶部的悬崖顶部是可能的50分钟，类似于10分钟或暴风雨，没有风暴浪涌。然而，悬崖上的巨石的实际分布仅被风暴波解释，但不是海啸。因此，在本网站上分布的巨煤可能是风暴波浪原点。我们开发的巨石运输计算模型可用于识别巨石的起源，可以通过海啸和风暴波来合理地计算巨石的悬崖顶部沉积。 （c）2019 John Wiley＆Sons，Ltd。

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