热带风暴 "帕布2019 "在泰国湾沿岸造成的冲刷沉积物的印迹;对风暴潮的沿海地貌响应的深入研究

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Chanakan Ketthong , Sumet Phantuwongraj , Montri Choowong , Vichai Chutakositkanon
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引用次数: 0

摘要

热带风暴帕布(2019 年 1 月 4 日)袭击了泰国南部,对低洼沿海地区造成了破坏。海浪、风暴潮和高潮的共同作用导致泰国湾(GOT)西海岸一侧的地区被冲刷和淹没。事件发生后,我们于 2019 年 1 月 7-10 日和 15-20 日进行了实地调查,以调查风暴潮的影响以及从风暴眼下的受灾地区到距离登陆点以北 500 公里的受灾程度。本文研究了沿海地貌特征的变化如何在区域范围内对热带风暴帕布所产生的风暴潮做出反应。在海滩沿岸观察到了冲刷、海滩疤痕、被撞倒的树木以及被摧毁的建筑物和基础设施造成的海岸破坏。受破坏最严重的地区位于那空沙马拉府(Nakhon Si Thammarat,NST),热带风暴登陆时的最大风速接近 100 公里/小时,风暴潮高度达 5 米。最厚的冲积沉积物(60 厘米厚)是在一个小河口附近相对低洼的地区发现的。泥质裂隙碎屑、平面分层、交叉分层、前置层理、底部冲刷、尖锐和侵蚀接触是风暴沉积物中沉积结构的特征。在一些地点,床形表面(如显示风暴潮方向的水流波纹)保存完好。我们认为,当地的地貌控制因素,特别是海岸高程,对沿岸地貌反应的差异以及冲刷沉积物的类型起了重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Imprints of washover sediments by tropical storm Pabuk 2019 along the coast of the Gulf of Thailand; insight into coastal geomorphological response to storm surge

Tropical storm Pabuk (4th January 2019) struck southern Thailand, causing damage to the low-lying coastal area. The combination of waves, storm surge, and high tide resulted overwash and inundation of regions on the West coast of the Gulf of Thailand (GOT) side. After the event, we conducted a field survey from January 7–10 and 15–20, 2019 to investigate the effect of storm surges and the degree of damage from the site under the eye of storm affected area up to the north 500 km from the landfall sites. This paper investigates how variations in coastal geomorphological features respond to the storm surge generated by tropical storm Pabuk at a regional scale. Coastal damage was observed along the beach from the presence of the scour, beach scarp, knocked down trees, and destroyed buildings and infrastructure. The most damaged area was at Nakhon Si Thammarat (NST), where the tropical storm made landfall with maximum wind speeds of almost 100 km/h and a storm surge height of 5 m. At NST site, the washover deposits extended as far as 80 m from the coastline with a maximum inundation of 330 m. From this study, two types of washover deposits including perched fan and washover terrace were identified. The thickest washover sediment, 60 cm thick, was discovered in a relatively low-lying area adjacent to a small estuary. Mud rip-up clasts, planar stratification, cross stratification, foreset bedding, scouring at base, and sharp and erosional contact are characteristics of sedimentary structures found in storm sediments. Bedform surfaces, such as current ripples with indicated storm surge direction, were well-preserved at several sites. We suggest that the local geomorphological controlling factors, especially coastal elevation have played important roles in the difference of coastal geomorphological responses as well as the type of washover deposits.

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来源期刊
Marine Geology
Marine Geology 地学-地球科学综合
CiteScore
6.10
自引率
6.90%
发文量
175
审稿时长
21.9 weeks
期刊介绍: Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.
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