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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >The formation of beaches on shore platforms in microtidal environments
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The formation of beaches on shore platforms in microtidal environments

机译：在微潮环境中海岸平台上海滩的形成

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摘要

Beaches are common features of many rocky shorelines and can be considered to be constrained by the underlying geology. In mesotidal to macrotidal areas the slope of the substrate and sediment supply are the primary factors in constraining the size and development of beaches on shore platforms. In microtidal settings it is not known if these factors are wholly responsible for determining the presence of beaches on shore platforms, nor the contribution of other factors such as hydrodynamics. The microtidal coast of Victoria, Australia, is surveyed in this study in order to quantify the morphological boundary conditions that constrain beach development on semi-horizontal shore platforms. An ample sediment supply indicates that the underlying geology is controlling the presence and absence of beaches. Where beaches occur they always overlie a rock ramp which is the steepest part of the platform. The two most important morphological constraints were platform width and height both of which significantly correlated with beach volume. An elevational threshold exists at just over +1.0 m where beaches cannot accumulate. Below this threshold, platform width appears to be the principle constraining factor in beach accumulation. An evolutionary model is inferred which suggests that dissipation of wave energy associated with platform widening plays an important role in allowing beaches to accumulate. The model suggests beaches on platforms will be particularly sensitive to sea level rise. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：海滩是许多多岩石的海岸线的共同特征，可以被认为受潜在地质条件的限制。在中潮至大潮区，底物的坡度和沉积物供应是限制岸台平台海滩规模和发展的主要因素。在微潮环境中，尚不清楚这些因素是否完全决定了海岸平台上海滩的存在，还是其他因素（如流体动力学）的贡献。在这项研究中，对澳大利亚维多利亚州的微潮海岸进行了调查，以量化限制半水平海岸平台上海滩发展的形态边界条件。充足的沉积物供应表明潜在的地质条件正在控制海滩的存在与否。在发生海滩的地方，它们总是覆盖在平台最陡峭的岩石坡道上。两个最重要的形态学约束是平台的宽度和高度，它们与海滩的体积都显着相关。海拔阈值刚好在+1.0 m处，海滩无法堆积。低于此阈值，平台宽度似乎是海滩堆积的主要限制因素。推导了一个演化模型，该模型表明与平台拓宽相关的波能耗散在允许海滩堆积中起着重要作用。该模型表明，平台上的海滩对海平面上升特别敏感。版权所有（c）2014 John Wiley＆Sons，Ltd.

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