走向了解沙漠海岸线-海岸地貌和动态周围的短暂的爱湖北,南澳大利亚

IF 0.8 4区 综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES Transactions of the Royal Society of South Australia Pub Date : 2022-01-02 DOI:10.1080/03721426.2022.2050506
J. May, S. M. May, S. Marx, T. Cohen, M. Schuster, A. Sims
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引用次数: 5

摘要

传统上,playa湖周围的海岸线在干旱地区晚第四纪巨型湖泊的重建中起着关键作用,但很少有人关注与现代短暂的playa湖(如澳大利亚中部的Kati Thanda-Lake Eyre)的间歇性填充事件相关的海岸线。本文介绍了艾尔湖北部干盐湖边缘的地貌测绘结果,并对这些数据进行了时间尺度和岸线过程驱动因素的解释。地貌的多样性和分布表明,岩性和波浪能的变化是大规模海岸线地貌的主要控制因素。我们的研究结果表明,海岸线特征的存在与否是过去湖泊水位的一个不完整和不准确的指标。相反,在短暂的playa湖环境中,波浪形成的地貌需要被视为与阈值相关的现象,水位变化的频率、幅度和速率的差异导致波浪驱动的地貌活动的垂直差异,从而导致地貌之间的地形差异。虽然大陆屏障可能最好地代表罕见的湖泊峰值水位,但屏障口或岛屿主要形成于较低和中等水平,通过较低能量的海岸漂移,从而提供了更完整的playa洪水事件记录。此外,最低震级的事件可能会导致盐湖边缘频繁的湿润和干燥,从而有效地推动与盐有关的生产和风积沉积物的收缩。因此,与海相或多年生湖泊岸线相比,完整的风驱动沉积过程需要与对特定湖泊的洪水频率和强度的准确理解相结合,才能建立湖湖周围岸线演化的综合模型。
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Towards understanding desert shorelines - coastal landforms and dynamics around ephemeral Lake Eyre North, South Australia
ABSTRACT While shorelines around playa lakes have traditionally played a key role for reconstructing late Quaternary megalakes in drylands, little attention has been given to recent shorelines associated with episodic filling events of modern ephemeral playa lakes such as Kati Thanda-Lake Eyre in central Australia. We here present results from geomorphic mapping around the playa margin of Lake Eyre North and interpret these data regarding timescales and drivers of shoreline processes. The diversity and distribution of landforms point to lithology and variations in wave energies as major controls on large-scale shoreline geomorphology. Our results suggest that the presence or absence of shoreline features is an incomplete and inaccurate indicator of past lake levels. Instead, wave-built landforms in ephemeral playa lake settings need to be considered threshold-related phenomena, with differences in frequency, magnitude and rate of water level change leading to vertically differing potential for wave-driven geomorphic activity and thus topographic differences between landforms. While mainland barriers probably best represent rare peak lake levels, barrier spits or islands dominantly form at lower and intermediate levels through lower energy longshore drift, thus providing a more complete record of playa flood events. Additionally, the lowest magnitude events offer potential for frequent wetting and drying along playa margins that effectively drives salt-related production and aeolian sediment deflation. Therefore, in contrast to marine or perennial lake shorelines, the complete range of wind-driven sedimentary processes needs to be coupled with an accurate understanding of lake-specific flooding frequency and magnitude towards a comprehensive model of shoreline evolution around playa lakes.
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来源期刊
CiteScore
1.40
自引率
12.50%
发文量
17
审稿时长
>12 weeks
期刊介绍: Published since 1880, the Transactions of the Royal Society of South Australia is a multidisciplinary journal that aims to publish high quality, peer-reviewed papers of particular relevance to Australasia. There is a particular focus on natural history topics such as: botany, zoology, geology, geomorphology, palaeontology, meteorology, geophysics, biophysics, soil science and environmental science, and environmental health. However, the journal is not restricted to these fields, with papers concerning epidemiology, ethnology, anthropology, linguistics, and the history of science and exploration also welcomed. Submissions are welcome from all authors, and membership of the Royal Society of South Australia is not required. The following types of manuscripts are welcome: Reviews, Original Research Papers, History of Science and Exploration, Brief Communications, Obituaries.
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