Response of sedimentation processes in the Minjiang River subaqueous delta to anthropogenic activities in the river basin

Wang, Ai‐Jun; Xiang, Yang; Zhen-kun, Lin; Wang, Liang; Jiang, Lin

doi:10.1016/j.ecss.2019.106484

Cited by 10 publications

(4 citation statements)

References 24 publications

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“…Since 2001, the sediment flux into the sea from the Minjiang River has been only 34% of that before the 1980s, resulting in an average deposition rate of 0.46 cm/a in this area, which was only 44% during 1963-1986. The sedimentation rates of underwater deltas are positively correlated with the change in sediment flux into the sea, and the sedimentation pattern of underwater deltas responds promptly to the change in sediment flux into the sea [21]. Previous studies have also found that there are spatial differences in the impact of sharp reductions in the sediment flux into the sea on the deposition rate of underwater deltas [11,21].…”

Section: The Effect Of the Sharp Decrease In The Sediment Flux From T...mentioning

confidence: 92%

“…The sedimentation rates of underwater deltas are positively correlated with the change in sediment flux into the sea, and the sedimentation pattern of underwater deltas responds promptly to the change in sediment flux into the sea [21]. Previous studies have also found that there are spatial differences in the impact of sharp reductions in the sediment flux into the sea on the deposition rate of underwater deltas [11,21].…”

Section: The Effect Of the Sharp Decrease In The Sediment Flux From T...mentioning

confidence: 92%

“…The far columnar samples exhibit a pattern of fining upward (ZZY03, ZZY07, ZZY54, and ZZY04). Wang et al (2020) believed that a large amount of coarse-grained sediment remained in a reservoir after a dam was built, and the sediment that was discharged into the ocean after the reservoir was impounded was mainly fine-grained sediments, which has led to the presence of fine-grained sediments since the mid-1980s [21].…”

Section: The Effect Of the Sharp Decrease In The Sediment Flux From T...mentioning

confidence: 99%

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Influence of the Hanjiang River’s Inlet Sediment Decrease on Modern Sedimentation in the Underwater Delta

Wang

Wan

et al. 2023

Applied Sciences

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The Hanjiang River is the second-largest river in Guangdong Province, China. The modern sedimentation pattern of the Hanjiang subaqueous delta has been significantly affected by changes in the sediment delivered by the Hanjiang River. Based on multiperiod charts and columnar samples from the Hanjiang subaqueous delta, the influence of a sharp decrease in the sediment flux from the Hanjiang River on the deposition of the Hanjiang subaqueous delta in the past 60 years was studied through a combination of chart-based analysis of the evolution of erosion and deposition and the analysis of sediment samples. The results showed that the significant reductions in sediment fluxes from the Hanjiang River and Rongjiang River had obviously spatially differentiated effects on the deposition pattern of the Hanjiang subaqueous delta. The significant decreases in sediment fluxes from the Hanjiang River and the Rongjiang River caused the sediment grain size of the columnar samples in the near-estuary area of the Hanjiang River subaqueous delta to coarsen upward, the deposition rate to decrease, and the depositional state to change to an erosional state. Since the sediments discharged into the ocean after reservoir impoundment are mainly fine-grained suspended sediments, the supply of coarse-grained sediments in the Hanjiang subaqueous delta decreased, resulting in the upward fining of the columnar samples. The spatial response pattern of the Hanjiang subaqueous delta to the sharp decrease in sediment flux into the sea differed significantly from those of the Yangtze and Yellow subaqueous deltas.

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Section: The Effect Of the Sharp Decrease In The Sediment Flux From T...mentioning

confidence: 92%

Section: The Effect Of the Sharp Decrease In The Sediment Flux From T...mentioning

confidence: 92%

Section: The Effect Of the Sharp Decrease In The Sediment Flux From T...mentioning

confidence: 99%

See 1 more Smart Citation

Influence of the Hanjiang River’s Inlet Sediment Decrease on Modern Sedimentation in the Underwater Delta

Wang

Wan

et al. 2023

Applied Sciences

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“…This is consistent with the fact that fine particles have a stronger affinity and sorption to organic matter compared to coarse particles. Additionally, the sediment accumulation rate is higher in the prodelta than in the delta front and offshore slope [90][91][92][93]. Compared with the Pearl River Estuary (13.02 mg cm −2 yr −1 ) [84], the MRE has a comparative potential for organic carbon burial (9.40 ± 3.54 mg cm −2 yr −1 in muddy sediment).…”

Section: Implications For Organic Carbon Cycling and Budgets In Mrementioning

confidence: 99%

Characteristics of Sedimentary Organic Matter in Tidal Estuaries: A Case Study from the Minjiang River Estuary

Tao

Xiang

et al. 2023

Water

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As one of the main interfaces of the Earth system, estuaries show the strongest land–sea interaction in the carbon cycle, which links terrestrial ecosystems to the marginal sea. Furthermore, estuaries are considered as one of the most active intermediate reservoirs for both terrestrial and marine matter due to complex hydrodynamic processes regulated by the river runoff, wave and tide. Processing of organic matter (OM) in tidal estuaries modifies its transfer and transformation from the river to the sea, so studies of on the source and distributions of estuarine OM can help us understand the behavior of production, exchange, transport and burial of diverse OM within this transition zone before entering the marginal sea. In this paper, we took the Minjiang River Estuary (MRE) as a typical system in which there is strong influence of the tide. The source, composition and spatial distribution of OM in surface sediments of MRE were deciphered based on multiple organic geochemical properties for source-specific biomarkers (n-alkanes, n-alkanols, sterols) and bulk OM. Results show that sedimentary organic components were negatively correlated with sediment grain size, which indicates fine particles such as silt and clay are the major carriers of the OM signals in tidal estuaries. Source-specific biomarker proxies indicate that in terms of source diversity the sedimentary OM in the MRE shows mixed signals of terrestrial and marine sources, and the proportion of terrestrial OM decreases with the increase in distance from the land. The fractional contributions of OM from the riverine (i.e., terrestrial), marine and deltaic sources were quantitatively estimated using a Monte Carlo (MC) three-end-member mixing model based on C/N and δ13C values, and the average contributions of the three sources are 40 ± 10%, 48 ± 10% and 12 ± 4%, respectively, with little contribution from deltaic sources. The dispersion of sedimentary OM from different sources in the MRE is primarily controlled by the depositional environment determined by dynamic conditions and tidal processes play a significant role in the redistribution of sedimentary OM dispersion patterns. Compared with other large estuaries in southeast China, the OM accumulation contribution in the tide dominated small and medium-sized estuaries such as the MRE which is largely dependent on riverine and marine deliveries. The MRE has a high potential for both terrestrial and marine organic carbon (OC) burial, with an accumulation rate of 3.39 ± 1.83 mg cm−2 yr−1 for terrestrial OC, and an accumulation rate of 3.18 ± 0.68 mg cm−2 yr−1 for marine OC in muddy sediment, making it an important contributor to the sedimentary carbon sink of the marginal sea.

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Morphological evolution of a large sand bar in the Qiantang River Estuary of China since the 1960s

2022

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Response of sedimentation processes in the Minjiang River subaqueous delta to anthropogenic activities in the river basin

Cited by 10 publications

References 24 publications

Influence of the Hanjiang River’s Inlet Sediment Decrease on Modern Sedimentation in the Underwater Delta

Influence of the Hanjiang River’s Inlet Sediment Decrease on Modern Sedimentation in the Underwater Delta

Characteristics of Sedimentary Organic Matter in Tidal Estuaries: A Case Study from the Minjiang River Estuary

Morphological evolution of a large sand bar in the Qiantang River Estuary of China since the 1960s

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