Formation of parabolic dunes from barchan and transverse dunes along Israel's Mediterranean coast
Formation of parabolic dunes from barchan and transverse dunes along Israel's Mediterranean coast
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DOI：
10.1002/esp.417
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发表时间：
2002-10
影响因子：
3.3
通讯作者：
H. Tsoar;D. Blumberg
中科院分区：
文献类型：
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作者：
H. Tsoar;D. Blumberg
以色列的地中海沿岸沙丘在世纪后半叶经历了土地利用的变化。由于密集的农业和畜牧业活动，沿海沙丘的天然植被被剥夺，直到世纪上半叶结束。新月形和横向沙丘是由强烈的西南冬季风形成的。世纪后半叶人类活动的减少导致沙丘顶部的自然植被恢复，这是唯一既没有侵蚀也没有沉积的地区。山顶植被的建立改变了这些新月形沙丘和横向沙丘的动态，因此并非所有从迎风面侵蚀的沙子都被带到背风面;一些被植物捕获。因此，迎风坡的形状从凸到凹，沙丘逐渐变成抛物线。在这项研究中，我们跟踪沙丘的形态动力学分析12组航空照片，这是从1944年至1995年。15个沙丘的平均前进速度从3.4米/年下降到1.9米/年，而植被覆盖率在此期间从4.3%增加到17%。版权所有© 2002年约翰威利父子有限公司。
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. Copyright © 2002 John Wiley & Sons, Ltd.