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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Formation of parabolic dunes from barchan and transverse dunes along israel's Mediterranean coast
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Formation of parabolic dunes from barchan and transverse dunes along israel's Mediterranean coast

机译：以色列地中海沿岸的Barchan和横向沙丘形成抛物线沙丘

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摘要

The Mediterranean coastal dunes of Israel underwent a land-use change during the second half of the 20th century. Due to intense agricultural and pastoral activity, the coastal dunes were stripped of natural vegetation until the end of the first half of the 20th century. The barchan and transverse dunes were shaped by strong southwesterly winter winds. A decrease in human activity during the second half of the 20th century brought about a renewal of natural vegetation on the dune crest-the only area with neither erosion nor deposition. The establishment of vegetation on the crest changes the dynamics of these barchan and transverse dunes, so that not all of the sand eroded from the windward side is carried to the lee slip-face; some is trapped by plants. Consequently, there is a change in the shape of the windward slope from convex to concave, and the dune gradually becomes parabolic. In this study we trace the morphodynamics of the dunes by analysing 12 sets of aerial photographs, which were taken from 1944 to 1995. The average rate of advance of 15 dunes has decreased from 3.4 m a~(-1) to 1.9 m a~(-1), while the vegetation cover has increased from 4.3 to 17 per cent during this period.
机译：以色列的地中海沿岸沙丘在20世纪下半叶经历了土地利用变化。由于大量的农业和牧草活动，沿海沙丘被剥夺了自然植被，直到20世纪上半叶才结束。沙丘和横向沙丘的形状是西南偏强的冬季风。 20世纪下半叶，人类活动的减少导致沙丘顶上自然植被的更新，沙丘顶是唯一既没有侵蚀也没有沉积的区域。在山顶上的植被的建立改变了这些沙丘和横向沙丘的动力，因此，并非所有从上风侧侵蚀的沙子都被带到背风面。有些被植物困住了。因此，迎风坡的形状从凸形变为凹形，沙丘逐渐变为抛物线形。在这项研究中，我们通过分析从1944年至1995年拍摄的12套航拍照片来追踪沙丘的形态动力学。15个沙丘的平均前进速度已从3.4 ma〜（-1）降至1.9 ma〜（- 1），而在此期间植被覆盖率从4.3％增加到17％。

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