Monitoring changes in suspended sediment concentration on the southwestern coast of Korea

Min, Jee-Eun; Choi, Jong-Kuk; Yang, Hyun; Lee, Seok; Ryu, Joo-Hyung

doi:10.2112/si70-023.1

Cited by 10 publications

(9 citation statements)

References 12 publications

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“…For satellite data, extracting ocean fronts is a key step in describing the frontal features in areas involving complex dynamic processes (Belkin, 2021). At present, several methods have been applied to extract SSFs from satellite images, including: (a) selecting a threshold SSC value as the front (Ge et al, 2020;Hafeez et al, 2021;Min et al, 2014;Wu et al, 2016), (b) histogram-based edge detection algorithms (Miller, 2004;H. Yang et al, 2016), (c) Sobel gradient-based edge extraction algorithms (Y.…”

Section: Front Extraction Methodsmentioning

confidence: 99%

Spatio‐Temporal Variability of Suspended Sediment Fronts (SSFs) on the Inner Shelf of the East China Sea: The Contribution of Multiple Factors

Zhang

Wei

et al. 2022

JGR Oceans

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Modulated by a host of complex processes, suspended sediment fronts (SSFs) on the inner shelf of the East China Sea persist strongly and vary notably. Using hourly suspended sediment concentration data collected by the Geostationary Ocean Color Imager over the period 2011–2021, a gradient‐based edge detection algorithm was implemented to extract SSFs; the frontal probability (FP) and seasonal and interannual variability were identified and interpreted. Pronounced frontal activity is principally confined to the nearshore waters within the 60‐m isobaths and decreases with increasing offshore distance. Frontogenesis is mainly determined by the bottom topography and tide‐induced mixing. Empirical orthogonal function decompositions reveal that the seasonal cycle dominates the variability of SSFs, which responds to the cycles of winds and related changes in coastal currents and upwelling. The highest FPs are identified in winter when wind‐induced suspended sediment transport and resuspension reach their annual maxima. In summer, stratification and the intrusion of Kuroshio subsurface water are not conducive to frontogenesis. Furthermore, the discharge of the Yangtze River has a certain influence on the frontal variability in the waters around the Zhoushan Archipelago. Notably, the interannual variability of SSFs is modulated by the El Niño‐Southern Oscillation. These findings, based on a comprehensive dataset of SSFs over 10 years, can usefully inform the studies of marine pollutant transport, sedimentary dynamics, fisheries, and wider ecological processes in the study area.

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Section: Front Extraction Methodsmentioning

confidence: 99%

Spatio‐Temporal Variability of Suspended Sediment Fronts (SSFs) on the Inner Shelf of the East China Sea: The Contribution of Multiple Factors

Zhang

Wei

et al. 2022

JGR Oceans

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“…In addition, the SS in coastal waters change considerably over time. The SS of coastal area yield relatively high values (>20 mg/L) and extremely high values (>200 mg/L) in winter because of the strong northwest monsoon [26]. Moreover, the SS is so dynamic that it shows a notable decrease over time at low tide and increases again 2-3 h after low tide for the transition of flood tide to ebb tide [27].…”

Section: Introductionmentioning

confidence: 99%

High-Frequency Monitoring of Suspended Sediment Variations for Water Quality Evaluation at Deep Bay, Pearl River Estuary, China: Influence Factors and Implications for Sampling Strategy

Zhou

Tian

Wai

et al. 2018

Water

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Suspended sediment (SS) is an important water quality indicator of coastal and estuarine ecosystems. Field measurement and satellite remote sensing are the most common approaches for water quality monitoring. However, the efficiency and precision of both methods are typically affected by their sampling strategy (time and interval), especially in highly dynamic coastal and estuarine waters, because only limited measurements are available to analyze the short-term variations or the long-term trends of SS. Dramatic variations of SS were observed, with standard deviation coefficients of 48.9% and 54.1%, at two fixed stations in Deep Bay, China. Therefore, it is crucial to resolve the temporal variations of SS and its main influencing factors, and thus to develop an improved sampling strategy for estuarine ecosystems. Based on two years of continuous high-frequency measurements of SS and concurrent tidal and meteorological data, we demonstrated that the tide is the dominant factor influencing the SS variation among tide, wind (speed and direction), and rainfall in Deep Bay, China. For the monitoring of maximum suspended sediment concentration (SSC), the recommended optimum sampling time coincides with the occurrence of the ebb tides, whereas multiple sampling times are recommended for monitoring of minimum SSC. Although variations of SS are also affected by other factors, the recommended sampling strategy could capture the maximum and minimum SSC variations exactly more than 85% days in a year on average in Deep Bay. This study provides a baseline of SS variation and direct sampling strategy guidance for future SS monitoring and could be extended to other coastal or estuarine waters with similar climatological/tidal exposures.

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“…Site A is located at the most northern coast of all sites, and site B is surrounded by islands. In addition, site B is characterized by shallow water depths (<50 m), relatively strong tidal currents (1-2 m/s), and complicated coastlines with numerous islands and more extensive tidal flats than the other sampling sites [26]. This suggests that the colonization of indigenous bacteria in sea cucumber could be affected by environmental factors other than water temperature.…”

Section: Comparison Of Bacterial Amounts and Diversity Indices Among mentioning

confidence: 96%

Whole-Body Microbiota of Sea Cucumber (Apostichopus japonicus) from South Korea for Improved Seafood Management

Kim

Lee

Kim

et al. 2017

Journal of Microbiology and Biotechnology

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Sea cucumber () is a popular seafood source in Asia, including South Korea, and its consumption has recently increased with recognition of its medicinal properties. However, because raw sea cucumber contains various microbes, its ingestion can cause foodborne illness. Therefore, analysis of the microbiota in the whole body of sea cucumber can extend our understanding of foodborne illness caused by microorganisms and help to better manage products. We collected 40 sea cucumbers from four different sites in August and November, which are known as the maximum production areas in Korea. The microbiota was analyzed by an Illumina MiSeq system, and bacterial amounts were quantified by real-time PCR. The diversity and bacterial amounts in sea cucumber were higher in August than in November. Alpha-, Beta-, and Gammaproteobacteria were common dominant classes in all samples. However, the microbiota composition differed according to sampling time and site. and were commonly detected potential pathogens in August and November samples, respectively. The effect of experimental infection on the indigenous microbiota of sea cucumber was analyzed at different temperatures, revealing clear alterations of and ; thus, these shifts can be used as indicators for monitoring infection of sea cucumber. Although further studies are needed to clarify and understand the virulence and mechanisms of the identified pathogens of sea cucumber, our study provides a valuable reference for determining the potential of foodborne illness caused by sea cucumber ingestion and to develop monitoring strategies of products using microbiota information.

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Monitoring changes in suspended sediment concentration on the southwestern coast of Korea

Cited by 10 publications

References 12 publications

Spatio‐Temporal Variability of Suspended Sediment Fronts (SSFs) on the Inner Shelf of the East China Sea: The Contribution of Multiple Factors

Spatio‐Temporal Variability of Suspended Sediment Fronts (SSFs) on the Inner Shelf of the East China Sea: The Contribution of Multiple Factors

High-Frequency Monitoring of Suspended Sediment Variations for Water Quality Evaluation at Deep Bay, Pearl River Estuary, China: Influence Factors and Implications for Sampling Strategy

Whole-Body Microbiota of Sea Cucumber (Apostichopus japonicus) from South Korea for Improved Seafood Management

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