Effects of an estuarine dam on sediment flux mechanisms in a shallow, macrotidal estuary

Figueroa, Steven Miguel; Lee, Guan‐hong; Shin, Hyunjung

doi:10.1016/j.ecss.2020.106718

Cited by 19 publications

(14 citation statements)

References 34 publications

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“…Other human activities including upstream dam construction, farmland reclamation, and tourism activities may increase landscape fragmentation and have a negative impact on vegetation and related ecosystems. Simultaneously, dam protection [ 55 , 56 ] and appropriate protection management [ 33 ] can respond to the change of ecological vulnerability by implementing different strategies to natural disasters and man-made disturbances. Finally, 17 indicators were selected from three subsystems ( Table 1 ).…”

Section: Methodsmentioning

confidence: 99%

Assessing Ecological Vulnerability under Climate Change and Anthropogenic Influence in the Yangtze River Estuarine Island-Chongming Island, China

Peng

Wang

Cai

2021

IJERPH

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Understanding and assessing ecological vulnerability for estuarine islands are important for maintaining estuarine island ecosystem services and its sustainable development. However, due to its complex fresh water–sea–land interaction mechanism and multiple stressors from both climate change and anthropogenic influence, a comprehensive evaluation of ecological vulnerability for estuarine islands has been limited. Therefore, taking the typical estuary island of Chongming Island as an example, we developed a comprehensive evaluation system of ecological vulnerability for an estuarine island ecosystem based on the pressure-state-response (PSR) conceptual model, and explored the spatial and temporal distribution of ecological vulnerability in 2005 and 2015. The results indicated that the main pressures of Chongming Island from saltwater intrusion intensity and land use intensity were mainly distributed in northern coastal areas and eastern areas of wetland; the ecological vulnerability index (EV) of Chongming Island showed a slight decrease from 2005 to 2015; and three categories of towns based on ecological vulnerability assessment for an eco-island planning and environmental management were identified. Our study provides an effective evaluation system of ecological vulnerability for estuarine islands, which could be helpful for planners and decision makers in improving eco-island planning and environmental management.

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Section: Methodsmentioning

confidence: 99%

Assessing Ecological Vulnerability under Climate Change and Anthropogenic Influence in the Yangtze River Estuarine Island-Chongming Island, China

Peng

Wang

Cai

2021

IJERPH

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“…In the GRE, the sediment was sandy-silt and d 50 was 14-58 µm (Ministry of Oceans and Fisheries, 2019). The mean current velocity reached approximately 0.5 m s −1 during the spring tide (Figueroa et al, 2020). The optical backscattering sensor and LISST-Holo were profiled at intervals of 30 min for 12 h on September 2, 2016, to collect the particle information.…”

Section: Study Sites and Data Collectionmentioning

confidence: 99%

Practical Method to Screen Contaminated Holograms of Flocs Using Light Intensity

et al. 2021

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Submergible digital holographic camera can measure the in situ size and shape of suspended particles, such as complex flocs and biological organisms, without disturbance. As the number of particles in the water column increases, overlapping concentric rings (interference patterns) can contaminate the holographic images. Using light intensity (LI), this study proposes a practical method to assess the degree of contamination and screen out contaminated images. The outcomes from image processing support that LI normalized on a gray scale of 0 (black) to 255 (white) can be a reliable criterion for defining the contamination boundary. Results found that as LI increased, the shape of the particle size distribution shifted from a positively skewed to a normal distribution. When LI was lower than approximately 80, owing to the distortion of particle properties, the settling velocities derived from the contaminated holograms with mosaic patterns were underestimated compared to those from the uncontaminated holograms. The proposed method can contribute to a more accurate estimation of the transport and behavior of cohesive sediments in shallow estuarine environments.

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“…Available case studies indicate that these estuarine dams can result in tidal amplification due to reflection of the tidal wave (Díez‐Minguito et al., 2012; Kang, 1999; Kwon & Lee, 1999), reduction of tidal currents due to loss of the tidal prism, and change in the magnitude of tidal asymmetry due to altered tidal and river forcing (Kang, 1999; Kim et al., 2006; Traini et al., 2015). 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).…”

Section: Introductionmentioning

confidence: 99%

“…For example, in a microtidal estuary with relatively large freshwater discharge, sediment flux convergence can occur due to a negative gradient in the seaward advective sediment flux driven by river runoff (Chang et al., 2020; Williams et al., 2015). In contrast, in a macrotidal estuary with moderate freshwater discharge, sediment flux convergence can occur due to a negative gradient in the landward tidal pumping sediment flux driven by tidal asymmetry (Figueroa, Lee, Chang, et al., 2020; Figueroa, Lee, & Shin, 2020; Zhu et al., 2017).…”

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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Effects of an estuarine dam on sediment flux mechanisms in a shallow, macrotidal estuary

Cited by 19 publications

References 34 publications

Assessing Ecological Vulnerability under Climate Change and Anthropogenic Influence in the Yangtze River Estuarine Island-Chongming Island, China

Assessing Ecological Vulnerability under Climate Change and Anthropogenic Influence in the Yangtze River Estuarine Island-Chongming Island, China

Practical Method to Screen Contaminated Holograms of Flocs Using Light Intensity

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

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