Dynamic behaviors of suspended sediment and chlorophyll-a in intertidal flats under episodic meteorological events

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Marine Geology Pub Date : 2024-06-19 DOI:10.1016/j.margeo.2024.107341

Hun Jun Ha , Jong Seong Khim , Ho Kyung Ha

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引用次数: 0

Abstract

Intertidal flats are important shallow-water habitats and buffers against coastal erosion. Strong, short-lasting meteorological events, such as storms and rainfall, are the main mechanisms of transporting (in)organic materials and sediments. Two in-situ mooring systems were installed simultaneously in the tidal channel and mudflat of Jeungdo, Korea, to understand the dynamic behaviors of suspended sediment and chlorophyll-a (chl-a) under the episodic events. During fair-weather periods with a distinct tidal cycle, the sediment in the mudflat was resuspended during the flood and then advected to the tidal channel during the ebb. The maximum suspended sediment concentration (SSC) and chl-a under storm event were approximately 9 and 2 times higher than those under fair-weather periods, respectively. Under rainfall event, the maxima were approximately 7 and 1.2 times higher than fair-weather, suggesting that sediment and microphytobenthos were highest resuspended by the meteorological events. In addition, a time lag (∼ 1.5 h) between SSC and chl-a occurred in the tidal channel during ebb tide with a rainfall event. During the post-rainfall periods, the SSC and chl-a increased, showing a positive relationship with the bed shear stress, suggesting that the rainfall event could reduce sediment stabilization.

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偶发气象事件下潮间带滩涂悬浮泥沙和叶绿素-a 的动态行为

潮间带滩涂是重要的浅水生境，也是防止海岸侵蚀的缓冲区。强烈、短暂的气象事件，如风暴和降雨，是（非）有机物和沉积物迁移的主要机制。为了了解偶发事件下悬浮沉积物和叶绿素-a（chl-a）的动态行为，在韩国正岛的潮汐河道和泥滩同时安装了两个原位系泊系统。在具有明显潮汐周期的晴天期间，泥滩中的沉积物在洪水期被重新悬浮，然后在退潮期被平移到潮汐通道中。暴雨期的最大悬浮泥沙浓度（SSC）和 chl-a 分别比平水期高约 9 倍和 2 倍。在降雨事件下，最大悬浮泥沙浓度和 chl-a 分别是晴天时的约 7 倍和 1.2 倍，表明气象事件对泥沙和微底栖生物的再悬浮作用最大。此外，在降雨退潮期间，潮汐河道中的 SSC 和 chl-a 之间出现了时滞（∼ 1.5 小时）。在降雨后的时间段内，SSC 和 chl-a 增加，与河床剪应力呈正相关，表明降雨事件可能会降低沉积物的稳定性。

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来源期刊

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.