Influence of reed stem density on foredune development
Influence of reed stem density on foredune development
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DOI：
10.1002/esp.257
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发表时间：
2001-10-01
影响因子：
3.3
通讯作者：
Kalkman, C
中科院分区：
文献类型：
--
作者：
Arens, SM;Baas, ACW;Kalkman, C
沙丘前缘植被密度对风沙流输移和沉积，进而对剖面发育起着重要的控制作用。在长期监测的田间试验中，三个小区种植了规则网格的芦苇束，三种不同的密度：4，2和1束每平方米。本研究报告了不同植被密度下的剖面发展差异。1996年5月至1997年4月测量了地形剖面。结果表明，三个芦苇束密度的剖面发展的重要差异：在最高密度的情节一个明显的，陡峭的沙丘开发，而在最低密度的一个更渐进和平滑的沙坡道沉积。当茎被完全掩埋时，剖面演化的差异消失了。1997年1月第二次种植芦苇茎后，又重复了这一过程。1997年5月，所有样地获得的沙量范围为11.5 - 12.3 m（3）m（-1），表明沉积物收支相对恒定，与特定剖面演变无关。该模型成功地再现了整体剖面的发展，但在一般情况下，用于植被传输相互作用的方程高估了植被的影响。这会导致场结果和模型结果之间存在一些偏差。这是几个原因进行了讨论。根据实验结果，提出了进一步研究的建议。版权所有（C）2001约翰威利父子有限公司
Vegetation density on foredunes exerts an important control on aeolian sediment transport and deposition, and therefore on profile development. In a long-term monitoring field experiment, three plots were planted with regular grids of reed bundles in three different densities: 4, 2 and 1 bundles per m(2). This study reports on the differences in profile development under the range of vegetation densities.Topographic profiles were measured between May 1996 and April 1997. Results indicate important differences in profile development for the three reed bundle densities: in the highest density plot a distinct, steep dune developed, while in the lowest density a more gradual and smooth sand ramp was deposited. When the stems had been completely buried, differences in profile evolution vanished. After a second planting of reed stems in January 1997 the process was repeated. In May 1997, all plots had gained a sand volume ranging from 11.5 to 12.3 m(3) m(-1), indicating that the sediment budget is relatively constant, regardless of the particular profile evolution.The field evidence is compared with simulations of profile development, generated by the foredune development model SAFE. The model successfully reproduces the overall profile development, but in general, the equations used for vegetation-transport interaction overestimate the effect of vegetation. This causes some deviations between field and model results. Several reasons for this are discussed. Based on the experiments reported here, recommendations are given for further research. Copyright (C) 2001 John Wiley & Sons, Ltd.