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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Abrasive notches along the Atlantic Patagonian coast and their potential use as sea level markers: the case of Puerto Deseado (Santa Cruz, Argentina)
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Abrasive notches along the Atlantic Patagonian coast and their potential use as sea level markers: the case of Puerto Deseado (Santa Cruz, Argentina)

机译：大西洋巴塔哥尼亚海岸的磨蚀性缺口及其在海平面标记中的潜在用途：Puerto Deseado案例（阿根廷圣克鲁斯）

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Patagonia Argentina is a key area for the study of sea level changes in the southern hemisphere, but the availability of reliable sea level markers in this area is still problematic. In fact the storm deposits (beach ridge) commonly used here to reconstruct past sea level oscillations introduce a wide error. Along the Puerto Deseado coast (Santa Cruz), morphometric analyses of 11 features were carried out using traditional measurement tools and a digital software-based method (tested on one selected feature) with the aim to investigate the possibility of their use as sea level markers. By undertaking accurate topographic profiles we identified the relationship between notches and current sea level. In detail, we identified two clusters of notch retreat point elevations, with a very low internal variability. The lower was located a little below the mean high tide level (mHT) and the upper located at least 0.5m above the maximum high tide level (MHT). Field observations of tidal levels and the position of notches suggest that the lower notches are active and the upper are inactive. This study on the abrasive notches attests their quality as sea level markers and opens up the use of fossil abrasive notches as palaeo sea level markers because the error linked to these features is substantially smaller than that introduced by beach ridges commonly used in the study area.
机译：阿根廷巴塔哥尼亚是研究南半球海平面变化的关键区域，但是该区域可靠海平面标记的可用性仍然存在问题。实际上，这里通常用来重建过去海平面振荡的风暴沉积物（海滩山脊）会带来很大的误差。沿着圣塞克鲁兹港（Puerto Deseado）海岸（圣克鲁斯），使用传统的测量工具和基于数字软件的方法（对一个选定的特征进行了测试），对11个特征进行了形态计量学分析，旨在研究将其用作海平面标记的可能性。通过进行准确的地形剖面，我们确定了缺口与当前海平面之间的关系。详细地说，我们确定了两个凹口后退点高程的集群，它们的内部变异性非常低。下部位于平均高潮位（mHT）的下方，而上部位于最大高潮位（MHT）的上方至少0.5m。现场观察到的潮汐水平和缺口的位置表明，较低的缺口处于活动状态，较高的缺口处于无效状态。这项对磨蚀性刻痕的研究证明了它们作为海平面标记的质量，并开辟了化石磨蚀性刻痕作为古海平面标记的用途，因为与这些特征相关的误差大大小于研究区域中常用的海滩山脊所引起的误差。

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