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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >The influence of rock resistance on coastal morphology around Lord Howe Island, southwest Pacific
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The influence of rock resistance on coastal morphology around Lord Howe Island, southwest Pacific

机译：岩石阻力对西南太平洋豪勋爵岛附近海岸形态的影响

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Lord Howe Island, in the northern Tasman Sea, is a remnant of a much larger Late Miocene basaltic shield volcano. Much of the island's coastline is exposed to waves that have unlimited fetch, but a marked contrast is provided by a fringing coral reef and lagoon that very effectively attenuate wave energy along a portion of the western coastline. The geology of the island is varied, with hard and resistant basalt lavas, breccias and tuffs of intermediate resistance, and highly erodible eolianites. This variability provides an excellent opportunity to examine the influence of rock resistance on the development of the spectacular rock coast landforms that occur around the island. The hardness of rocks and the extent of weathering around the coastline were assessed using a Schmidt hammer, and statistical analysis was undertaken to remove outlying values. On all but one occasion, higher mean rebound values were returned from fresh surfaces than weathered surfaces, but only half of these differences were statistically significant. Shore platforms with two distinct levels are juxtaposed along two stretches of coastline and Schmidt hammer results lend support to hypotheses that the raised surfaces may be inherited features. Relative rock resistance was assessed through a combination of Schmidt hammer data and measurements of joint density, and constrained on the basis of morphological data. This approach formed a basis for examining threshold conditions for sea-cliff erosion at Lord Howe Island in the context of the distribution of resistant plunging cliffs and erosional shore platforms.
机译：塔斯曼海北部的豪勋爵岛是更大的晚中新世玄武岩盾形火山的残余物。该岛的大部分海岸线都受到无限取回的海浪的影响，但边缘的珊瑚礁和泻湖却形成了明显的反差，它们非常有效地衰减了西部海岸线一部分的海浪能量。该岛的地质条件各不相同，有坚硬且具有抵抗力的玄武岩熔岩，角砾岩和凝灰岩具有中等抵抗力，以及易侵蚀的风成岩。这种可变性提供了一个极好的机会，可以检查岩石阻力对岛屿周围壮观的岩石海岸地貌发展的影响。使用Schmidt锤评估岩石的硬度和海岸线周围的风化程度，并进行统计分析以去除外围值。除一种情况外，在所有情况下，新鲜表面返回的平均回弹值均高于风化表面，但这些差异中只有一半具有统计学意义。沿两条海岸线并排设置有两个不同高度的岸台，施密特锤结果为假说凸起表面可能是继承特征提供了支持。通过结合施密特锤数据和节理密度测量来评估相对岩石阻力，并根据形态学数据进行约束。这种方法为检查豪勋爵岛海崖侵蚀的临界条件提供了基础，该条件是在抵抗性倾斜悬崖和侵蚀性海岸平台的分布范围内进行的。

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