High resolution luminescence chronology of coastal dune deposits near Chumphon, Western Gulf of Thailand

IF 3.1 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Aeolian Research Pub Date : 2022-06-01 DOI:10.1016/j.aeolia.2022.100797
Johannes M. Miocic , Ritu Sah , Sakonvan Chawchai , Peerasit Surakiatchai , Montri Choowong , Frank Preusser
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引用次数: 5

Abstract

The development of coastal dunes is linked to environmental controls such as sea-level variability, climatic conditions, and coastal morphology. Understanding the spatial and temporal variations of dunes is crucial for predicting how coastal landscapes may react to future climate changes and sea-level rise. However, there are very few detailed studies on the longer time-scale evolution (centennial to millennial) of coastal dunes from subtropical and tropical regions. Here, we combine a high-resolution luminescence chronology with sedimentological analyses to study the depositional history of a transverse coastal dune located within the Bang Berd dune field, Western Gulf of Thailand. While luminescence dating of uniform aeolian deposits is normally straight forward, we observe strong variations in the natural dose rate which are likely explained by the enrichment of accessory minerals in some laminae. Deposition of the dune started at least around 3000 years ago and coincides with a regional sea level drop. Sedimentary structures indicate deposition occurring predominantly in relation to the northeasterly winter monsoon. As the sea-level rise and increased storm intensity in the future may lead to stronger erosion along the coast, this study is highlighting the importance of the Bang Berd dune system as natural protection against coastal inundation.

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泰国湾西部春丰附近海岸沙丘沉积物的高分辨率发光年代学
海岸沙丘的发展与环境控制有关,如海平面变化、气候条件和海岸形态。了解沙丘的时空变化对于预测沿海景观对未来气候变化和海平面上升的反应至关重要。然而,对亚热带和热带海岸沙丘较长时间尺度(百年至千年)演化的详细研究却很少。在这里,我们将高分辨率发光年代学与沉积学分析相结合,研究了位于泰国湾西部Bang Berd沙丘场内的横向海岸沙丘的沉积历史。虽然均匀风成沉积物的发光测年通常是直接的,但我们观察到自然剂量率的强烈变化,这可能是由于某些层状中附属矿物的富集。沙丘的沉积至少在3000年前开始,与区域海平面下降相吻合。沉积构造表明沉积主要与东北冬季季风有关。由于未来海平面上升和风暴强度的增加可能导致沿海地区的侵蚀加剧,本研究强调了Bang Berd沙丘系统作为抵御沿海洪水的天然屏障的重要性。
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来源期刊
Aeolian Research
Aeolian Research GEOGRAPHY, PHYSICAL-
CiteScore
7.10
自引率
6.10%
发文量
43
审稿时长
>12 weeks
期刊介绍: The scope of Aeolian Research includes the following topics: • Fundamental Aeolian processes, including sand and dust entrainment, transport and deposition of sediment • Modeling and field studies of Aeolian processes • Instrumentation/measurement in the field and lab • Practical applications including environmental impacts and erosion control • Aeolian landforms, geomorphology and paleoenvironments • Dust-atmosphere/cloud interactions.
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