Different fates of the Yangtze and Mississippi deltaic wetlands under similar riverine sediment decline and sea-level rise

Yang, Hongwei; Yang, S.L.; Li, B.C.; Wang, Y.P.; Wang, J.Z.; Zhang, Z.L.; Xu, Kehui; Huang, Ying; Shi, Benwei; Zhang, W.X.

doi:10.1016/j.geomorph.2021.107646

Cited by 26 publications

(4 citation statements)

References 76 publications

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“…Similarly, the annual sediment flux of these deltas is subject to human activities, such as hydropower dam construction and sand mining. The annual sediment flux of the Mekong River, the Yangtze and the Mississippi have recently reduced by 74%, 76%, and 55%, respectively (Binh et al, 2020;Yang et al, 2021).…”

Section: Sediment Budgetmentioning

confidence: 99%

A numerical investigation on the suspended sediment dynamics and sediment budget in the Mekong Delta

THANH,

Roelvink,

van der Wegen

et al. 2024

Preprint

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Fluvial sediment supply towards the coast has been the subject of extensive research. Important aspects relate to the impact of sediment retaining hydropower dams, potential delta progradation, coastal sediment supply and delta vulnerability to sea level rise. Once validated, process-based models provide a valuable tool to address these aspects and offer detailed information on sediment pathways, distribution and budget in specific systems. This study aims to advance the understanding of the sediment dynamics and sediment budget in the Mekong Delta system. We developed a process-based model (Delft3D FM) that allows coupling 2D area grids to 1D network grids. The flexible mesh describes both wide river sections and channel irrigation and drainage networks present in the Mekong Delta. We calibrated the model against observed discharge, salinity, suspended sediment concentration (SSC) and sediment flux. The model was able to skillfully describe seasonal variations of SSC and hysteresis of SSC and water discharge caused byTonle Sap Lake induced flow patterns and seasonally varying bed sediment availability in the channels. Model results suggest that the Mekong River delivers ~99 Mt/year of sediment at Kratie, towards the delta which is much lower than the common estimate of 160 Mt/year. About 23% of the modeled total sediment load at Kratie reaches the sea. Our modelling approach is a useful tool to assess sediment dynamics under strategic anthropogenic interventions or climate change scenarios.

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Section: Sediment Budgetmentioning

confidence: 99%

A numerical investigation on the suspended sediment dynamics and sediment budget in the Mekong Delta

THANH,

Roelvink,

van der Wegen

et al. 2024

Preprint

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“…The shallow shelf also benefits nearshore sedimentation, rather than rapid transport and loss into deep trenches and seas as that along leading edge coasts (Inman and Nordstrom, 1971). This shallow-water sedimentation leads to the formation of a broad subaqueous delta over which the temporally deposited and accumulated sediment could be reworked and partially transported back into the delta as a second-hand marine sediment source (Yang et al, 2020a(Yang et al, , 2020bYang et al, 2021). The importance of this marine sediment source may stand out more clearly in the Anthropocene given a large decline in riverine sediment supply.…”

Section: The CD In a Global Contextmentioning

confidence: 99%

Changjiang Delta in the Anthropocene: Multi-scale hydro-morphodynamics and management challenges

Guo

Zhu

Xie

et al. 2021

Earth-Science Reviews

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“…The largest dam in the Narmada River Basin of India traps 60-80% of sediments (Gupta and Chakrapani 2005). The Yangtze annual sediment flux declined from 510 Mt/year in the pre-dam period (1956)(1957)(1958)(1959)(1960)(1961)(1962)(1963)(1964)(1965)(1966)(1967)(1968) to 120 Mt/year during the post-dam period (2013)(2014)(2015) after the construction of the Danjiangkou and Three Gorges dams in the basin (Yang et al 2018a;Yang et al 2021). Moreover, river sediments are important carriers of chemicals such as nutrients, salt, and pollutants.…”

Section: Introductionmentioning

confidence: 99%

Effects of cascade reservoir systems on the longitudinal distribution of sediment characteristics: a case study of the Heihe River Basin

Wang

Juan-juan

et al. 2021

Environ Sci Pollut Res

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Spatial variations in grain size parameters can reflect river sediment transport patterns and depositional dynamics. Therefore, 22 surficial sediment samples taken from the Heihe River and its cascade reservoirs were analyzed to better understand the impact of cascade reservoir construction on sediment transport patterns in inland rivers in China. The results showed that the longitudinal distribution of sediment grain size in the Heihe River was significantly affected by the influence of the cascade reservoirs. The retention rate in the cascade reservoir of the Heihe River reached 79% (193.53 Mt/year), which caused most of the fine sand to accumulate in the reservoir, and the sediment fining degree reached approximately 50%. However, the water discharged from the dam caused serious erosion of the riverbed and coarsening of the sediment, and the coarsening degree was approximately 500%. The backwater zone of the reservoir was influenced by both backwater and released water, and the coarsening degree of sediment was approximately 101%. Sedimentary environmental analysis revealed that the characteristics of the sediment grain size in an upstream tributary of the Heihe River were more influenced by source material than by hydrodynamic conditions, while the grain size characteristics of the mainstream sediments were controlled mainly by hydrodynamic conditions. The characteristics of sediment transport in different reaches of the Heihe River were studied, and the results may provide references for the operation of cascade reservoirs and the sediment control of reservoirs.

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Different fates of the Yangtze and Mississippi deltaic wetlands under similar riverine sediment decline and sea-level rise

Cited by 26 publications

References 76 publications

A numerical investigation on the suspended sediment dynamics and sediment budget in the Mekong Delta

A numerical investigation on the suspended sediment dynamics and sediment budget in the Mekong Delta

Changjiang Delta in the Anthropocene: Multi-scale hydro-morphodynamics and management challenges

Effects of cascade reservoir systems on the longitudinal distribution of sediment characteristics: a case study of the Heihe River Basin

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