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The Cosmolian program for simulating aeolian dynamics and its application to central Australia
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2021-05-25 , DOI: 10.1002/esp.5169 Shlomy Vainer 1, 2, 3 , Yoav Ben Dor 2
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2021-05-25 , DOI: 10.1002/esp.5169 Shlomy Vainer 1, 2, 3 , Yoav Ben Dor 2
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The wide spatial coverage of sand dunes in continental interiors makes the understanding of their activity and accumulation history valuable for palaeoenvironmental reconstructions and the interpretation of landscape evolution. Nevertheless, the study of aeolian landscape development at the million-year timescale is hampered by the complex interaction of factors determining dune migration and the inherently self-destructive nature of their chronostratigraphy, thus limiting the applicability of traditional dating methods. This study presents a standalone program that simulates aeolian transport based on luminescence-derived chronologies coupled with numerical modelling of the accumulation of cosmogenic nuclides. This integrative approach to modelling the history of aeolian landforms reveals phases of emergence of aeolian sand into the landscape, and provides a data-based scheme that facilitates the morphodynamical study of aeolian processes over multiple timescales and up to several millions of years. The application of the program for reanalysing previously reported data from the Australian Simpson Desert reveals multiple pulses of sand dispersion into central Australia at 3.8–3.4, 2.9–2.5 and 1.5–1 Ma, corresponding to pronounced changes in climatic conditions and landscape deformation events. The synchronicity of the results with the established environmental framework that would promote the production and aeolian distribution of sand exemplifies the applicability of process-based modelling in constructing a timeframe of key landscape evolution events in arid environments by studying aeolian deposits. The dependence of the parameters used to determine environmental settings on sand transportation patterns additionally makes the program a powerful tool to further investigate the triggers and mechanisms of aeolian processes.
中文翻译：
模拟风沙动力学的 Cosmolian 程序及其在澳大利亚中部的应用
大陆内部沙丘的广泛空间覆盖使得对其活动和堆积历史的了解对于古环境重建和景观演变的解释具有重要意义。然而，百万年时间尺度的风成景观发展研究受到沙丘迁移因素的复杂相互作用及其年代地层学固有的自毁性质的阻碍，从而限制了传统测年方法的适用性。这项研究提出了一个独立的程序，该程序基于发光衍生的年表以及宇宙成因核素积累的数值模型来模拟风成输运。这种模拟风积地貌历史的综合方法揭示了风积沙进入景观的阶段，并提供了一种基于数据的方案，可促进对多个时间尺度和长达数百万年的风成过程进行形态动力学研究。应用重新分析先前报告的澳大利亚辛普森沙漠数据的程序显示，沙子在 3.8-3.4、2.9-2.5 和 1.5-1 Ma 时向澳大利亚中部扩散，这与气候条件和景观变形事件的显着变化相对应。结果与已建立的环境框架的同步性将促进沙子的生产和风积分布，这证明了基于过程的建模在通过研究风积沉积物构建干旱环境中关键景观演变事件的时间框架中的适用性。
更新日期：2021-07-09
中文翻译：
模拟风沙动力学的 Cosmolian 程序及其在澳大利亚中部的应用
大陆内部沙丘的广泛空间覆盖使得对其活动和堆积历史的了解对于古环境重建和景观演变的解释具有重要意义。然而，百万年时间尺度的风成景观发展研究受到沙丘迁移因素的复杂相互作用及其年代地层学固有的自毁性质的阻碍，从而限制了传统测年方法的适用性。这项研究提出了一个独立的程序，该程序基于发光衍生的年表以及宇宙成因核素积累的数值模型来模拟风成输运。这种模拟风积地貌历史的综合方法揭示了风积沙进入景观的阶段，并提供了一种基于数据的方案，可促进对多个时间尺度和长达数百万年的风成过程进行形态动力学研究。应用重新分析先前报告的澳大利亚辛普森沙漠数据的程序显示，沙子在 3.8-3.4、2.9-2.5 和 1.5-1 Ma 时向澳大利亚中部扩散，这与气候条件和景观变形事件的显着变化相对应。结果与已建立的环境框架的同步性将促进沙子的生产和风积分布，这证明了基于过程的建模在通过研究风积沉积物构建干旱环境中关键景观演变事件的时间框架中的适用性。
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