地球和火星上巴肯沙丘的形态:分类和尺度不变量

IF 3.9 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Douglas J. Sherman, Pei Zhang, Jinsu Bae, Robert J. Butler, Andreas C. W. Baas
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引用次数: 0

摘要

利用卫星图像测量了地球(30 个沙丘区域的 2,686 个沙丘)和火星(10 个沙丘区域的 720 个沙丘)上的沙丘形态特征。这些数据用于:(a)建立新的沙丘分类系统;(b)比较地球和火星上沙丘的特征;(c)评估大体上的沙丘是否显示出异速或尺度不变的特征。我们获得了巴昌虫体的宽度和长度、包括角在内的巴昌虫的宽度和长度以及每个角的长度的尺寸度量。此外,还得出了身体宽度与角尖之间宽度之比(宽度比)、整个弓形体长度与身体长度之比(长度比)以及长角长度与短角长度之比(对称比)的无量纲指标。利用宽度比、长度比和对称比将巴昌鱼分为八种类型,并比较它们在两颗行星上的分布特征。分析结果表明,从形态计量学角度来看,地球上的沙丘与火星上的沙丘截然不同,地球上的沙丘平均体型较小,且多为对称型;而火星上的沙丘多为收敛角,相对于中心沙丘体较短,且多为非对称型。分析进一步揭示了巴钦沙丘的平面形态可以被认为是尺度不变的,我们认为体宽是代表巴钦沙丘大小的最合适的衡量标准。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Morphology of Barchan Dunes on Earth and Mars: Classification and Scale-Invariance

Morphology of Barchan Dunes on Earth and Mars: Classification and Scale-Invariance

Morphological characteristics were measured for barchan dunes on Earth (2,686 dunes in 30 barchan fields) and Mars (720 dunes in 10 barchan fields) using satellite images. The data were used to (a) develop a new barchan classification system; (b) compare characteristics of barchans on Earth and Mars; and (c) assess whether barchans, in bulk, display allometric or scale-invariant characteristics. Dimensional metrics were obtained for the width and length of barchan bodies, the width and length of barchans including the horns, and the length of each horn. Dimensionless metrics were derived for the ratios of the body width to the width between the tips of the horns (width ratio), the length of the entire barchan to the length of the body (length ratio), and the length of the longer horn to the shorter horn (symmetry ratio). The width, length, and symmetry ratios were used to classify barchans into eight types and compare the characteristics of their distributions on the two planets. From this analysis, it was established that, statistically, barchans on Earth are distinctive from those on Mars based on the morphometrics, with terrestrial barchans being, on average, of smaller size and more often symmetrical, while Martian barchans more often have convergent horns that are short relative to the central dune body and are more often asymmetrical. The analysis further reveals that barchan planform morphology can be considered scale-invariant, and we argue that body width is the most appropriate measure representing barchan size.

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来源期刊
Journal of Geophysical Research: Planets
Journal of Geophysical Research: Planets Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)
CiteScore
8.00
自引率
27.10%
发文量
254
期刊介绍: The Journal of Geophysical Research Planets is dedicated to the publication of new and original research in the broad field of planetary science. Manuscripts concerning planetary geology, geophysics, geochemistry, atmospheres, and dynamics are appropriate for the journal when they increase knowledge about the processes that affect Solar System objects. Manuscripts concerning other planetary systems, exoplanets or Earth are welcome when presented in a comparative planetology perspective. Studies in the field of astrobiology will be considered when they have immediate consequences for the interpretation of planetary data. JGR: Planets does not publish manuscripts that deal with future missions and instrumentation, nor those that are primarily of an engineering interest. Instrument, calibration or data processing papers may be appropriate for the journal, but only when accompanied by scientific analysis and interpretation that increases understanding of the studied object. A manuscript that describes a new method or technique would be acceptable for JGR: Planets if it contained new and relevant scientific results obtained using the method. Review articles are generally not appropriate for JGR: Planets, but they may be considered if they form an integral part of a special issue.
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