The effect of Holocene changes in relative sea level on the morphology of rocky coasts
The effect of Holocene changes in relative sea level on the morphology of rocky coasts
复制标题
全新世相对海平面变化对岩石海岸形态的影响
DOI：
10.1016/j.geomorph.2009.02.003
复制
发表时间：
2010
期刊：
影响因子：
3.9
通讯作者：
A. Trenhaile
中科院分区：
文献类型：
--
作者：
A. Trenhaile
利用波浪-风化数学模型研究了全新世相对海平面变化对岩岸发育的影响。使用来自瑞典、美国东北部、英国西南部、日本中部、西非和澳大利亚南部的全新世RSL记录，在宏观和中潮环境中对快速和慢速侵蚀海岸进行了模型运行。在海平面不变的情况下进行了进一步的一系列相同的运行。RSL的变化决定了海洋过程在现代潮间带内运作的时间量，波衰减和侵蚀的速率继续受到潮下带形态的影响，当RSL上升到目前的水平时，在大多数地区发展。该模型表明，虽然潮差也很重要，但全新世RSL的变化促进了澳大拉西亚和南半球大部分地区的近水平台地发展，以及北方半球大部分地区的倾斜台地。海岸平台可能部分继承自全新世早期，当时的RSL与今天的相似。然而，大多数平台在所有潮汐水位上继续受到侵蚀。在地质和波浪条件不太有利的地方，在RSL上升到目前位置的地区，下潮间带的侵蚀基本上已经终止，而今天的侵蚀只发生在全新世中期RSL上升到目前水平以上的地方的下潮间带。
A mathematical wave and weathering model was used to study the effect of Holocene changes in relative sea level (RSL) on rock coast development. Model runs were made for fast- and slow-eroding coasts in macro- and mesotidal environments using Holocene RSL records from Sweden, northeastern USA, southwestern Britain, central Japan, western Africa, and southern Australia. A further series of otherwise identical runs were made with constant sea level. Changes in RSL determined the amount of time that marine processes have operated within the modern intertidal zone, and rates of wave attenuation and erosion continue to be influenced by subtidal morphology that developed in most areas when RSL was rising to its present level. The model suggested that although tidal range is also important, Holocene RSL changes promoted subhorizontal platform development in Australasia and over much of the Southern Hemisphere, and sloping platforms over much of the Northern Hemisphere. Shore platforms may have been partly inherited from earlier periods in the Holocene, when RSL was similar to today's. Nevertheless, most platforms continue to be eroded at all tidal levels. Where geological and wave conditions are less favourable, erosion in the lower intertidal zone has essentially terminated in areas where RSL rose to its present position, whereas erosion only occurs today in the lower intertidal zone in places where RSL rose to above its present level in the middle Holocene.