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The relationship between barchan size and barchan morphology: a case study from Northern Namibia
South African Geographical Journal ( IF 1.662 ) Pub Date : 2021-02-02
Barend Jacobus van der Merwe

ABSTRACT

Landform allometry has been a topic of inquiry since at least the 1970s. In this study, the presence of allometry is investigated for a barchan dunefield in northern Namibia. Using a combination of traditional morphometric parameters and techniques borrowed from geometric morphometrics it is shown that barchan allometry is present. This allometry is a combination of positive and negative allometry. Barchans show a definite change in mean shape as the size of the dune increases becoming more asymmetric. Differences in horn length, along with dune width, show positive allometry indicating that it changes faster than the shape changes. Barchan bilateral asymmetry and stoss length show negative allometry indicating that changes in these variables lag behind changes in size. Together, these results hint at the possible presence of threshold size differences beyond which distinct shape changes can be observed.



中文翻译:

barchan大小与barchan形态之间的关系:以北纳米比亚为例

摘要

至少从1970年代开始,地形异度法就一直是人们研究的话题。在这项研究中,调查了纳米比亚北部的一个巴肯·邓内菲尔德(barchan dunefield)异体存在的情况。结合使用传统形态计量学参数和从几何形态计量学借来的技术,可以证明存在barchan异形。这种异形体是正性和负形体的组合。随着沙丘尺寸的增加,Barchans的平均形状发生了确定的变化,变得更加不对称。牛角长度和沙丘宽度的差异显示出正的立体感,表明其变化快于形状变化。Barchan的双侧不对称性和索托长度显示为负异形,表明这些变量的变化滞后于尺寸变化。一起,

更新日期:2021-02-03
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