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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Quantification of cliff retreat in coastal Quaternary sediments using anatomical changes in exposed tree roots
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Quantification of cliff retreat in coastal Quaternary sediments using anatomical changes in exposed tree roots

机译：在沿海季沉积物中悬崖撤退的定量使用曝光树根的解剖学变化

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摘要

Sea cliffs represent 80% of the world's coasts and can be found virtually in all types of morphogenetic environments. Most studies on rocky environments focused on the impacts of modern sea level rise on cliff stability derived from sequential surveys, direct measurements or erosional features in anthropogenic structures. In this study, we explore the potential of dendrogeomorphic techniques to quantify multidecadal changes in coastal environments on Porquerolles Island (France). We sampled a total of 56 cross-sections from 16 Pinus halepensis Mill. roots growing on former alluvial deposits and on sandy-gravelly cliffs to quantify mean annual cliff retreat rates as well as changes in cliff geometry. Anatomical changes in roots have been used successfully in the past to quantify continuous denudation rates on slopes, channel incision and gullying processes but the approach has not been used so far in a coastal cliff context. At Porquerolles Island, reconstructed rates of cliff retreat cover 30-40 years and show average erosion rates between 0.6 and 3.9 cm yr(-1) (average: 2.1 cm yr(-1)). Highest rates are observed at Pointe de la Tufiere (2.6-3.9 cm yr(-1)), a small rock promontory that is more exposed to wave and storm surges than the remainder of the study area. By contrast, lower erosion rates are recorded at cliffs protected by the La Courtade pocket beach (0.6-1.9 cm yr(-1)). This contribution demonstrates that dendrogeomorphic analyses of roots clearly have a significant potential and that they are a powerful tool for the quantification of multidecadal rates of cliff retreat in areas where measurements of past erosion are lacking. More specifically, the approach also has clear advantages over the shorter time series obtained with repeat monitoring (e.g. terrestrial laser scanning, sensors, erosion pins) or over longer, but more coarsely resolved records obtained from aerial photographs or radio-nuclides. (c) 2018 John Wiley & Sons, Ltd.
机译：海悬崖占世界海岸的80％，并且几乎可以在各种类型的形态发生环境中找到。大多数关于岩石环境的研究专注于现代海平面上升对悬崖稳定性的影响，这些悬崖稳定性来自序贯调查，直接测量或人为结构中的侵蚀特征。在这项研究中，我们探讨了Dencrogeomorphic技术的潜力，以量化Porquerolles Island（法国）沿海环境中的多数环境变化。我们在16个Pinus Halepensis磨坊中排出了总共56个横截面。生长在前冲积的沉积物上和沙砾悬崖上的根源，以量化平均年度悬崖撤退率以及悬崖几何的变化。过去已经成功使用了根部的解剖学变化，以量化斜坡，通道切口和沟壑过程的连续剥削速率，但该方法尚未在沿海悬崖背景下使用。在Porquerolles Island，悬崖撤退盖的重建速率30-40岁，并显示平均侵蚀速率0.6和3.9厘米Yr（-1）（平均：2.1cm Yr（-1））。 Pointe de La Tufiere（2.6-3.9厘米Yr（-1）），一个小岩石海角，比研究区域的其余部分更为暴露于波浪和风暴潮。相比之下，较低的侵蚀率在由La Courtade Pocket海滩保护的悬崖上（0.6-1.9厘米YR（-1））。这种贡献表明，根系的根系分析显然具有重要潜力，并且它们是在缺乏过去腐蚀测量的区域中悬崖撤退的多程率的强大工具。更具体地，该方法还通过重复监测（例如陆地激光扫描，传感器，侵蚀引脚）或超过更长的时间序列，或者从空中照片或无线电核素获得的更长的记录更长的时间序列具有明显的优点。 （c）2018 John Wiley＆Sons，Ltd。

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