Suspended sediment load in the turbidity maximum zone at the Yangtze River Estuary: The trends and causes

Yang, Yixin; Li, Yitian; Sun, Zhilin; Fan, Yadong

doi:10.1007/s11442-014-1077-3

Cited by 58 publications

(39 citation statements)

References 10 publications

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“…Our study suggests that two factors acting together are responsible for this switch: firstly, increased nutrients in the Yangtze basin due to increasing sewage and fertilizer in the last decade (Xu et al, 2013a), and secondly decreasing SPM in the estuary due to damming (Li, 2012;Yang et al, 2014).…”

Section: The Yangtze Estuary: Formerly a Source And Now A Sink Of Phomentioning

confidence: 87%

See 1 more Smart Citation

The fate of phosphorus in the Yangtze (Changjiang) Estuary, China, under multi-stressors: Hindsight and forecast

Newton

Wolanski

et al. 2015

Estuarine, Coastal and Shelf Science

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Section: The Yangtze Estuary: Formerly a Source And Now A Sink Of Phomentioning

confidence: 87%

“…At the same time, based on the decrease of SPM in recent years as a result of dams (Fig. 1b) (Yang et al, 2014), SPM may further decrease to values between 200 and 500 mg L À1 . The decrease in estuarine SPM, driven by the long-term reduction of riverine sediment input, inevitably results in more DIP inflow to the estuary.…”

Section: A Forecast For 2050mentioning

confidence: 95%

The fate of phosphorus in the Yangtze (Changjiang) Estuary, China, under multi-stressors: Hindsight and forecast

Newton

Wolanski

et al. 2015

Estuarine, Coastal and Shelf Science

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“…Quite recently, considerable attention has been paid to evaluate the effect of climate change (Fettweis et al, 2012) and human interventions (Schuttelaars et al, 2013;Winterwerp and Wang, 2013;Yang et al, 2013;De-Jonge et al, 2014) on natural distribution of SPM in estuaries. There is numerical evidence linking freshwater abstractions to an increased potential for up-estuary transport .…”

Section: Introductionmentioning

confidence: 99%

Turbidity in the fluvial Gironde Estuary (southwest France) based on 10-year continuous monitoring: sensitivity to hydrological conditions

Jalón‐Rojas

Schmidt

Sottolichio

2015

Hydrol. Earth Syst. Sci.

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Abstract. Climate change and human activities impact the volume and timing of freshwater input to estuaries. These modifications in fluvial discharges are expected to influence estuarine suspended sediment dynamics, and in particular the turbidity maximum zone (TMZ). Located in southwest France, the Gironde fluvial-estuarine system has an ideal context to address this issue. It is characterized by a very pronounced TMZ, a decrease in mean annual runoff in the last decade, and it is quite unique in having a long-term and highfrequency monitoring of turbidity. The effect of tide and river flow on turbidity in the fluvial estuary is detailed, focusing on dynamics related to changes in hydrological conditions (river floods, periods of low discharge, interannual changes). Turbidity shows hysteresis loops at different timescales: during river floods and over the transitional period between the installation and expulsion of the TMZ. These hysteresis patterns, that reveal the origin of sediment, locally resuspended or transported from the watershed, may be a tool to evaluate the presence of remained mud. Statistics on turbidity data bound the range of river flow that promotes the upstream migration of TMZ in the fluvial stations. Whereas the duration of the low discharge period mainly determines the TMZ persistence, the freshwater volume during high discharge periods explains the TMZ concentration at the following dry period. The evolution of these two hydrological indicators of TMZ persistence and turbidity level since 1960 confirms the effect of discharge decrease on the intensification of the TMZ in tidal rivers; both provide a tool to evaluate future scenarios.

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“…Additionally, it should be noted that deposition of fine‐grained particles and greater SPM occurred within estuarine turbidity zone can be largely enhanced by flocculation due to the interactions between river runoff and saltwater intrusion (Li et al, ; Pang et al, ). Moreover, periodic resuspension and mobilization of fine‐grained sediments additionally increase the level of turbidity in the near‐bottom layer during storm/energetic conditions (Yang et al, ). Notably, the greater SPM with lower river flow from enhanced phytoplankton production seems unlikely given that in situ productivity in this high turbidity zone is largely light limited (Gordon & Goñi, ; Knowlton & Jones, ).…”

Section: Discussionmentioning

confidence: 99%

Fate of Organic Carbon Burial in Modern Sediment Within Yangtze River Estuary

et al. 2020

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Large river‐dominated margins play a potential key role in regulating global carbon cycle and budget due to high terrestrial organic carbon (Corg) inputs and sediment accumulation rates. Here bulk elements (Corg and TN), isotopic compositions (δ13Corg and δ15N), radioisotope 210Pb, sedimentary grain size, pH, Eh, and physicochemical properties were analyzed on samples from the Yangtze River Estuary to determine the mechanism involved in transporting sedimentary Corg offshore. In addition, nine box‐cores were analyzed to further reveal the potential effects of the declining sediment load on the modern depositional pattern of Corg. The statistical analyses indicate that the hydrodynamically driven sediment composition exerts a significant control on the transport, mobilization, and accumulation of sedimentary Corg from the river to the estuary, with respect to the redistribution of fine‐grained sediments. Furthermore, X‐radiographs and 210Pb indicate that reworked environment dominates carbon burial in the Yangtze proximal deposit, while a stable sedimentary environment of Corg (3.50–5.58 g cm−2 year−1) is observed in the Yangtze distal mud. Notably, the enhanced erosional inputs that contain terrestrial plant debris (mainly the coarse fractions) have tended to become important sources for Corg. Although reworked sediments in the Yangtze River Estuary are frequently exposed to oxygen during physical and biological processes, there appears to be a high potential for long‐term sedimentary Corg storage, due to its association with sediment particles (mainly the clay fractions) that provide physical protection against its degradation.

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Suspended sediment load in the turbidity maximum zone at the Yangtze River Estuary: The trends and causes

Cited by 58 publications

References 10 publications

The fate of phosphorus in the Yangtze (Changjiang) Estuary, China, under multi-stressors: Hindsight and forecast

The fate of phosphorus in the Yangtze (Changjiang) Estuary, China, under multi-stressors: Hindsight and forecast

Turbidity in the fluvial Gironde Estuary (southwest France) based on 10-year continuous monitoring: sensitivity to hydrological conditions

Fate of Organic Carbon Burial in Modern Sediment Within Yangtze River Estuary

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