Evaluation of along-channel sediment flux gradients in an anthropocene estuary with an estuarine dam

Figueroa, Steven Miguel; Lee, Guan‐hong; Chang, Jongwi; Schieder, Nathalie W.; Kim, Kyeongman; Kim, Seok-Yun

doi:10.1016/j.margeo.2020.106318

Cited by 31 publications

(20 citation statements)

References 56 publications

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“…Such anthropogenic interventions drastically modify sediment budgets in estuarine and deltaic systems, having important consequences for navigation, ecology, and flood safety. Moreover, current sediment management policies may impact the system's capacity to cope with sea-level rise in the coming decades 15 .In situ measurements, remote satellite observations, and numerical simulations have shown that estuary sediment fluxes are driven by the combination of hydro-meteorological forcing, such as tides, waves, wind, and river discharge [16][17][18][19][20] . These fluxes directly depend on the availability of sediment pools originating from marine, estuarine and riverine sources 2 .…”

mentioning

confidence: 99%

“…In situ measurements, remote satellite observations, and numerical simulations have shown that estuary sediment fluxes are driven by the combination of hydro-meteorological forcing, such as tides, waves, wind, and river discharge [16][17][18][19][20] . These fluxes directly depend on the availability of sediment pools originating from marine, estuarine and riverine sources 2 .…”

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confidence: 99%

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Unraveling the impacts of meteorological and anthropogenic changes on sediment fluxes along an estuary-sea continuum

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Bismuth

Verney

2021

Sci Rep

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Sediment fluxes at the estuary-sea interface strongly impact particle matter exchanges between marine and continental sources along the land-sea continuum. However, human activities drive pressures on estuary physical functioning, hence threatening estuarine habitats and their ecosystem services. This study explores a 22-year numerical hindcast of the macrotidal Seine Estuary (France), experiencing contrasted meteorological conditions and anthropogenic changes (i.e., estuary deepening and narrowing). The hindcast was thoroughly validated for both water column and sediment bed dynamics and showed good capacities to simulate annual sediment budgets observed from 1990 to 2015. We aim at disentangling the relative contributions of meteorological and human-induced morphological changes on net sediment fluxes between the estuary and its adjacent coastal sea. Our results highlight that intense wave events induce fine sediment (≤ 100 µm) export to the sea but coarser sediment (≥ 210 µm) import within the estuary. Although intense river discharges induce mud export to the sea, moderate to large river discharges prove to support mud import within the estuary. Wave and river discharge events were less intense in 2005–2015 than in 1990–2000, reducing fine sediment export to the sea. The estuary deepening and narrowing due to human activities increased fine sediment import within the estuary, shifting the estuary from an exporting to importing system. We propose a conceptualization of mud flux response to river discharge and wave forcing, as well as anthropogenic pressures. It provides valuable insights into particle transfers along the land-sea continuum, contributing to a better understanding of estuarine ecosystem trajectories under global changes.

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confidence: 99%

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confidence: 99%

Unraveling the impacts of meteorological and anthropogenic changes on sediment fluxes along an estuary-sea continuum

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Bismuth

Verney

2021

Sci Rep

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“…Estuarine processes are largely controlled by the interaction between climate-related changes in sea level, environmental factors, such as the oceanographic regime, sediment availability, and tectonics, as well as anthropogenic impacts [14][15][16][17][18][19]. The interplay of these factors results in a variety of different estuarine settings, ranging from wavedominated, microtidal estuaries to macrotidal estuaries with extensive gently sloping coastal plains [14].…”

Section: Introductionmentioning

confidence: 99%

“…However, the shape and position of an estuary mouth may change due to anthropogenically accelerated deposition and erosion [29] to the effect that humanly altered estuarine dynamics may deviate from their natural conditions. In fact, anthropogenic impacts have already exceeded the forces of natural factors on estuarine planform geometry in many parts of the world [15,19,30,31]. Easy and quick measurements of estuarine size and shape have therefore become essential in order to predict long-term estuarine spatial evolution, hydrodynamics, and the effects of human alterations on them.…”

Section: Introductionmentioning

confidence: 99%

MorphEst: An Automated Toolbox for Measuring Estuarine Planform Geometry from Remotely Sensed Imagery and Its Application to the South Korean Coast

et al. 2021

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The rapid advance of remote sensing technology during the last few decades provides a new opportunity for measuring detectable estuarine spatial change. Although estuarine surface area and convergence are important hydraulic parameters often used to predict long-term estuarine evolution, the majority of automated analyses of channel plan view dynamics have been specifically written for riverine systems and have limited applicability to most of the estuaries in the world. This study presents MorphEst, a MATLAB-based collection of analysis tools that automatically measure estuarine planform geometry. MorphEst uses channel masks to extract estuarine length, convergence length, estuarine shape, and areal gain and loss of estuarine surface area due to natural or human factors. Comparisons indicated that MorphEst estimates closely matched with independent measurements of estuarine surface area (r = 0.99) and channel width (r = 0.92) of 39 estuaries along the South Korean coast. Overall, this toolbox will help to improve the ability to solve research questions commonly associated with estuarine evolution as it introduces a tool to automatically measure planform geometric features from remotely sensed imagery.

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“…In situ measurements, remote satellite observations, and numerical simulations have shown that estuary sediment fluxes are driven by the combination of hydro-meteorological forcing, such as tide, waves, wind, and river flow [12][13][14][15][16] . Sediment export to coastal seas is usually associated with wave-induced sediment resuspension, whereas sediment import within estuaries mainly results from tidal and gravitational circulations 14 .…”

Section: Introductionmentioning

confidence: 99%

Unraveling The Impacts of Meteorological and Anthropogenic Changes on Sediment Fluxes Along an Estuary-Sea Continuum

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Bismuth

Verney

2021

Preprint

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Sediment fluxes at the estuary-sea interface strongly impact particle matter exchanges between marine and continental sources along the land-sea continuum. However, human activities drive pressures on estuary physical functioning, hence threatening estuarine habitats and their ecosystem services. There is an increasing societal need to better predict the potential trajectories of estuarine sediment fluxes resulting from natural and anthropogenic pressures, but the concomitance of human-induced and meteorological-induced changes makes the responses ambiguous. Therefore, this study explores a 22-year numerical hindcast, experiencing contrasted meteorological conditions and human-induced morphological changes (i.e., estuary deepening and narrowing), in order to disentangle the relative contributions of meteorological and anthropogenic changes on net sediment fluxes between a macrotidal estuary and its adjacent coastal sea. Our results highlight that intense wave events induce fine sediment (≤100 µm) export to the sea but coarser sediment (≥210 µm) import within the estuary. Remarkably, moderate to large river flows support mud import within the estuary. Over 25 years, the reduction of intense wave and river flow events reduces fine sediment export to the sea. In addition, the estuary morphological changes due to human activities increase fine sediment import within the estuary, shifting the estuary from an exporting to importing system. We propose a conceptualization of mud flux response to river flow and wave forcing, as well as anthropogenic pressures. It provides valuable insights into particle transfers along the land-sea continuum, contributing to a better understanding of estuarine ecosystem trajectories under global changes.

show abstract

Evaluation of along-channel sediment flux gradients in an anthropocene estuary with an estuarine dam

Cited by 31 publications

References 56 publications

Unraveling the impacts of meteorological and anthropogenic changes on sediment fluxes along an estuary-sea continuum

Unraveling the impacts of meteorological and anthropogenic changes on sediment fluxes along an estuary-sea continuum

MorphEst: An Automated Toolbox for Measuring Estuarine Planform Geometry from Remotely Sensed Imagery and Its Application to the South Korean Coast

Unraveling The Impacts of Meteorological and Anthropogenic Changes on Sediment Fluxes Along an Estuary-Sea Continuum

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