Sediment transport mechanisms in altered depositional environments of the Anthropocene Nakdong Estuary: A numerical modeling study

Chang, Jongwi; Lee, Guan‐hong; Harris, Courtney K.; Song, Yong-Sik; Figueroa, Steven Miguel; Schieder, Nathalie W.; Lagamayo, Kenneth D.

doi:10.1016/j.margeo.2020.106364

Cited by 19 publications

(18 citation statements)

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“…The sediment transport of estuaries is an important carrier of materials that circulate between land and marine ecosystems (Li et al, 2021). However, due to increasing human activities, including the construction and operation of water conservation projects, serious environmental problems, such as runoff discharge reduction, coastal erosion and seawater intrusion, have occurred in global estuary systems (Bertone et al, 2016;Chang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the water-sediment regulation scheme (WSRS) impact on suspended sediment transport in the Yellow River Estuary

Jia

2023

Front. Mar. Sci.

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IntroductionThe transport of suspended sediment plays an important role in regulating erosion-accretion in estuaries. The Yellow River, the second longest river in China, which has a large amount of sediment and contributes sediment to the Yellow River Estuary (YRE) every year. The water and sediment discharge patterns in the lower reaches of the Yellow River have experienced significant changes over recent decades. In particular, the water-sediment regulation scheme (WSRS) of the Xiaolangdi Reservoir transports large amounts of water and sediment to the YRE within a very short time, causing dramatic changes in the spatiotemporal estuarine sediment dynamics.MethodsIn this study, we presented a coupled numerical model based on FVCOM-SWAVE-SED that considered the highly dynamic sediment variations in the YRE. The sediment distribution and erosion-accretion patterns in the YRE during the WSRS in 2013 were analyzed by the high-resolution model.ResultsThe sediment entering the YRE spread with freshwater, forming a high sediment concentration zone near the river mouth, where most of the sediments were deposited. The sediment dispersal distance was limited by the tidal shear frontal (TSF), and the southeast outspread length of the sediment was slightly larger than the northwest spread. Outside of the YRE, the areas with high flow currents exhibited high erosion. We examined the effects of the main external driving forces (such as waves, tides, and runoff) on the sediment distribution and showed that runoff, tides, and waves were the key factors affecting the sediment distribution of the YRE.ResultsThis study shows that WSRS effectively changes the sediment distribution and erosion condition in the YRE and provides a data for researches on changes in estuarine ecosystems.

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Section: Introductionmentioning

confidence: 99%

Numerical study of the water-sediment regulation scheme (WSRS) impact on suspended sediment transport in the Yellow River Estuary

Jia

2023

Front. Mar. Sci.

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“…Such deposition may depend on the tidal range and river discharge, as suggested by available sediment flux studies. 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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“…Much of the Earth's land surface is experiencing anthropogenically driven land use change and erosion at unprecedented rates (Owens, 2020; Russell et al., 2017; Shi et al., 2021). The rapid conversion of natural and rural landscapes into urban systems has diminished agricultural productivity, increased sediment pollution, and has counteracted urban sustainability (Chang et al., 2020; Zarnaghsh & Husic, 2021). The global urban population is expected to double by 2050 (Bettencourt et al., 2018), which will be met with increasing urban development as well as agricultural activity to satisfy population demands.…”

Section: Introductionmentioning

confidence: 99%

“…

Much of the Earth's land surface is experiencing anthropogenically driven land use change and erosion at unprecedented rates (Owens, 2020;Russell et al, 2017;Shi et al, 2021). The rapid conversion of natural and rural landscapes into urban systems has diminished agricultural productivity, increased sediment pollution, and has counteracted urban sustainability (Chang et al, 2020;. The global urban population is expected to double by 2050 (Bettencourt et al, 2018), which will be met with increasing urban development as well as agricultural activity to satisfy population demands.Managing erosion and tracing sediment back to its origin is complicated by uncertainties in the connectivity of pathways, flow-dependence of source-zone activation, and sensitivity of tracers to successfully identify sources (Husic et al, 2020;Michalek et al, 2021;Owens, 2020).

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confidence: 99%

Plutonium Isotopes: An Effective Tool for Fluvial Sediment Sourcing in Urbanized Catchments

Percich

Husic

Ketterer

2022

Geophysical Research Letters

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Much of the Earth's land surface is experiencing anthropogenically driven land use change and erosion at unprecedented rates (Owens, 2020;Russell et al., 2017;Shi et al., 2021). The rapid conversion of natural and rural landscapes into urban systems has diminished agricultural productivity, increased sediment pollution, and has counteracted urban sustainability (Chang et al., 2020;. The global urban population is expected to double by 2050 (Bettencourt et al., 2018), which will be met with increasing urban development as well as agricultural activity to satisfy population demands.Managing erosion and tracing sediment back to its origin is complicated by uncertainties in the connectivity of pathways, flow-dependence of source-zone activation, and sensitivity of tracers to successfully identify sources (Husic et al., 2020;Michalek et al., 2021;Owens, 2020). The most widely employed radioisotope, Cesium-137 ( 137 Cs, t 1/2 = 30.2 years), was deposited on surficial soil in large quantities during nuclear weapons testing in the 1960s (Ritchie & McHenry, 1990) . However, in the intervening decades, 137 Cs has reduced to just ∼25% of its original levels, rendering its application more challenging as time progresses limiting its utility as a tracer with conventional techniques (Alewell et al., 2017;Collins et al., 2020) although recent analytical advancements are allowing sensitive detection of 137 Cs (Povinec, 2018). A recent study of radionuclides in sediment tracing calls on the community to identify new tracers for soil redistribution as depleted tracers lose some viability (Alewell et al., 2017). Plutonium ( 239+240 Pu) has garnered significant attention as an alternative tracer of erosion as it was globally deposited in the same manner as 137 Cs, but consists of two major long-lived isotopes ( 239 Pu, t 1/2 = 24,110 years;

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Sediment transport mechanisms in altered depositional environments of the Anthropocene Nakdong Estuary: A numerical modeling study

Cited by 19 publications

References 45 publications

Numerical study of the water-sediment regulation scheme (WSRS) impact on suspended sediment transport in the Yellow River Estuary

Numerical study of the water-sediment regulation scheme (WSRS) impact on suspended sediment transport in the Yellow River Estuary

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

Plutonium Isotopes: An Effective Tool for Fluvial Sediment Sourcing in Urbanized Catchments

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