An Analytical Study on Heavy Siltation in the Keum River Estuary After a Dike Construction

Lee, Jung L.; Cho, Il-Hyoung

doi:10.1142/9789812703040_0041

Cited by 3 publications

(6 citation statements)

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“…8 km upstream from the river mouth in 1994. The bottom and tidal flats within the estuary were covered with muddy sediments after the dam construction (Kim et al 2006;Lee and Lee 2007). The water gates of the dam are opened to discharge fresh water at ebb to low tide once or twice in a day in summer and once every few days in winter according to the volume of water in the dam.…”

Section: Study Area and Observationmentioning

confidence: 99%

“…Benthic microalgae are considered to have been distributed in the Geum River estuary at least formerly, since numerous species of pennate diatoms were abundantly recorded in the surface sediments of tidal flats in the Saemangeum estuary (i.e., Mangyeong and Dongjing Rivers, immediately south of the Geum River estuary) in 1988 (Oh and Koh 1995). There is a possibility that the tidal flats are not suitable for benthic microalgae to proliferate owing to heavy siltation in the Geum River estuary (Kim et al 2006;Lee and Lee 2007).…”

Section: Dynamics Of Pommentioning

confidence: 99%

“…The Geum River estuary has suffered from large-scale coastal developments (i.e., dam, jetty, and channel) since the 1990s. As a result of sediment flux in the estuary, a large part of the bottom has recently been covered by muddy sediments (Kim et al 2006;Lee and Lee 2007), which used to be transported into the Yellow Sea before the construction of the dam (Park et al 1986;Wells and Park 1992). Performing numerical calculations based on historical observations, Kim et al (2006) concluded that the sedimentation has been accelerated because of both the decrease of current velocity and dominance of flood tide particularly in the upper estuary owing to the dam.…”

Section: Implications For Estuarine Organismsmentioning

confidence: 99%

“…The Geum River is one of the macrotidal rivers flowing into the Yellow Sea. Although it used to transport a large amount of suspended solids from the catchment to the continental shelf every year (Park et al 1986;Wells and Park 1992), suspended solids from the sea as well as the catchment were deposited within the estuary after the construction of a tide barrier near the river mouth in 1994 (Kim et al 2006;Lee and Lee 2007). In addition, jetties were constructed and channels were dredged in the 1990s.…”

Section: Introductionmentioning

confidence: 99%

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Instability of the turbidity maximum in the macrotidal Geum River estuary, western Korea

et al. 2009

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In the low-salinity area of many macrotidal estuaries, through the combination of tidal pumping and estuarine circulation, an estuarine turbidity maximum (ETM) develops providing favorable conditions for various organisms. To investigate ecological roles of the ETM in East Asian estuaries, we conducted seasonal observations in the Geum (or Keum) River estuary, one of the representative macrotidal estuaries flowing into the Yellow Sea, from 2007 to 2008. The estuary was frequently filled with high-salinity ([10 PSU) and low-turbidity (\100 NTU) water under small or no freshwater discharge from a dam (ca. 8 km upstream from the river mouth). Brackish water was, however, completely pushed out of the estuary within a few hours after an intensive discharge in summer. Chlorophyll a (up to 50 lg l -1 ) and pheophytin (up to 80 lg l -1 ) were concentrated in a low-salinity (\1 PSU) and high-turbidity (up to 1000 NTU) area, indicating that the intensive discharge transported both living phytoplankton and resuspended detritus into the area. In contrast, a phytoplankton bloom (chlorophyll a, up to 100 lg l -1 ) was observed at low salinities under little discharge in winter. The present study demonstrated an absence of the ETM suitable for estuarine-dependent organisms from the present Geum River estuary, indicating potential importance of adequate control of freshwater discharge for the formation and maintenance of the ETM.

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Section: Study Area and Observationmentioning

confidence: 99%

Section: Dynamics Of Pommentioning

confidence: 99%

Section: Implications For Estuarine Organismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Instability of the turbidity maximum in the macrotidal Geum River estuary, western Korea

et al. 2009

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“…In turn, altered tidal and river forcing has been inferred to change the salinity structure and estuarine type (Shin et al., 2019), including the potential to develop periodic stratification (Figueroa et al., 2019; Figueroa, Lee, & Shin, 2020). Furthermore, the reduced tidal currents and estuarine dam discharge have been observed to result in lower suspended sediment concentration (SSC; Kim et al., 2006; Traini et al., 2015), increasing fluvial sediment abundance (Williams et al., 2014), and enhanced deposition of fine sediment in the remnant estuary (Kim et al., 2006; Lee & Lee, 2007; Tilai et al., 2019; van Proosdij et al., 2009; Williams et al., 2013, 2014; Zhu et al., 2017). Such deposition may depend on the tidal range and river discharge, as suggested by available sediment flux studies.…”

Section: Introductionmentioning

confidence: 99%

Impact of Estuarine Dams on the Estuarine Parameter Space and Sediment Flux Decomposition: Idealized Numerical Modeling Study

et al. 2022

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Estuaries are regions where rivers flow into the coastal ocean. The physical functioning of estuaries varies greatly and depends on the estuary size, shape, sedimentary characteristics, and external physical forcing by the river, tides, waves, and wind (Wolanski & Elliot, 2016). The net result of these features is the overall water circulation pattern. Sediments are important in estuaries because sediment flux gradients contribute to the depth and texture of the bed and the overall turbidity of the water column which in turn affects estuarine fisheries and navigability. At present, sediment fluxes are changing in estuaries, as humans have modified the shape of estuaries worldwide through activities such as land reclamation, dredging, and the construction of hard engineering structures (Jung et al., 2021;Wang et al., 2015). Land reclamation and dredging are often carried out to create land area and improve navigability, respectively (Winterwerp & Wang, 2013), while hard engineering structures such as breakwaters, riprap, jetties, and seawalls have been designed to absorb wave energy and stabilize the coast (Davis &

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Prediction of the Turbidity Distribution Characteristics in a Semi-Enclosed Estuary Based on the Machine Learning

Kim,

Park

2023

Water

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This study addresses the critical challenge of predicting sediment behavior in a semi-enclosed estuary, where the interplay between artificial freshwater discharge and seawater significantly impacts turbidity. Such environments are characterized by complex hydrodynamic interactions that lead to cycles of sediment settling and resuspension, influenced by tidal forces. To tackle this problem, we employed machine learning, leveraging its capability to analyze and predict complex non-linear phenomena. Our approach involved extensive transect observations conducted over two years, encompassing 11 ebb tide and 9 flood tide cycles. These observations were crucial for training the machine learning model, ensuring it captured the nuanced dynamics of sediment behavior under varying hydrodynamic conditions. The necessity of this research lies in its potential to enhance our understanding of sediment dynamics in estuaries, a vital aspect for environmental management and engineering projects. The findings demonstrate a promising alignment between the machine learning model’s predictions and the theoretically assumed sediment behavior, highlighting the model’s effectiveness in deciphering and predicting turbidity patterns in these challenging environments.

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An Analytical Study on Heavy Siltation in the Keum River Estuary After a Dike Construction

Cited by 3 publications

References 0 publications

Instability of the turbidity maximum in the macrotidal Geum River estuary, western Korea

Instability of the turbidity maximum in the macrotidal Geum River estuary, western Korea

Impact of Estuarine Dams on the Estuarine Parameter Space and Sediment Flux Decomposition: Idealized Numerical Modeling Study

Prediction of the Turbidity Distribution Characteristics in a Semi-Enclosed Estuary Based on the Machine Learning

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