Bottom fine sediment boundary layer and transport processes at the mouth of the Changjiang Estuary, China

Shi, John Z.; Zhang, S.Y.; Hamilton, L. J.

doi:10.1016/j.jhydrol.2005.11.039

Cited by 41 publications

(22 citation statements)

References 51 publications

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“…The dramatic difference in the sediment concentration in the TMZ between the neap and spring tides was due to greater resuspension during spring tides. Because this is the main dynamic mechanism for the formation of the TMZ in the Yangtze River Estuary (Li and Zhang 1998;Shi et al 2006;Wu et al 2012), the spring tides would have stronger effects on the TMZ than the neap tides. Figure 6 shows that the sediment concentration in the TMZ during spring tides (587.23 mg/L) was much higher than that during neap tides (300.25 mg/L).…”

Section: Discussionmentioning

confidence: 99%

“…The advection-diffusion scheme used for suspended sediments transported in the water column is the same as that used for salinity and temperature. Because fine sediment (<63 μm) accounts for more than 95 % of the sediment load in the Yangtze River Estuary (Shi et al 2006), only cohesive sediment was modeled in this study. Using the Cartesian (in the horizontal direction) and sigma (in the vertical direction) coordinates, the equation describing the transport process of cohesive sediment in the water column can be found in Tetra Tech (2007) water quality simultaneously, whereas the POM is not.…”

Section: Methodsmentioning

confidence: 99%

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Response of the turbidity maximum zone in the Yangtze River Estuary due to human activities during the dry season

Chen

Shen

Yang

2016

Environ Sci Pollut Res

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The interaction between a river and the sea results in a turbidity maximum zone (TMZ) within the estuary, which has a great impact on the local ecosystem. In the Yangtze River Estuary, the magnitude and extent of the TMZ vary with water discharge. In this study, the cumulative human activity altered the water discharge regime from the river to the estuary. In the post-Three Gorges Dam (TGD) period, water discharge increased by 35.10 % at Datong in February compared with that in the pre-TGD period. The effects of water discharge variation on the characteristics of the TMZ were analyzed during spring and neap tidal periods using the three-dimensional environmental fluid dynamic code (EFDC) model. The area of the TMZ decreased by 3.11 and 17.39 % during neap and spring tides, respectively. In addition, the upper limit of the TMZ moved 11.68 km seaward during neap tide, whereas the upper limit of the TMZ in the upstream and downstream areas moved seaward 9.65 and 2.34 km, respectively, during spring tide. These findings suggest that the area and location of the TMZ are more sensitive to upstream runoff during spring tide than during neap tide. These changes in the TMZ will impact the biochemical processes in the Yangtze River Estuary. In the foreseeable future, the distribution characteristic of TMZ will inevitably change due to variations in the Yangtze River discharge resulting from new human activities (i.e., new dams), which are being constructed upstream in the Yangtze River system.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Response of the turbidity maximum zone in the Yangtze River Estuary due to human activities during the dry season

Chen

Shen

Yang

2016

Environ Sci Pollut Res

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“…Despite its location near shoreline, very coarse sand to coarse sand dominated the sediment fraction in station L5. The Cisanggarung river runoff includes a large amount of volcanic materials, thus tidal surge could play an important role in the distribution of metals in the sediments (Alagarsamy, 2006;Shi et al, 2006;Dessai et al, 2009). The texture of surface-layer sediments changes constantly due to current and turbulance, bioturbation of benthic organisms, or human activities like trawling (Everaarts and Fischer, 1992; Zhang et al, 2001;Shi, 2010;Webster and Ford, 2010).…”

Section: Discussionmentioning

confidence: 99%

Distribution of Metals in Cisanggarung Estuary Sediment, West Java, Indonesia

Budiyanto¹,

Lestari²

2015

Mar. Res. Indonesia

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Volcanic activities have infl uenced the Cisanggarung estuary in western Cirebon Regency, altering metal concentrations in the bottom sediment. Observation of metal content in the ocean there was carried out in August 2009. Sediment samples were collected at 16 stations along the Cisanggarung coastline. The aim of this work was to determine the spatial distribution of Cd, Cu, Pb and Zn in the sediment of the Cisanggarung estuary. Sediment was destructed using 3 acids: nitric acid, chloride acid and peroxide acid, which was then analyzed by Flame Atomic Absorption Spectrophotometry based on the US EPA 3050b method. The highest concentrations of Cd, Cu, Pb and Zn in the sediment were 0.73 mg/kg dry weight, 31.4 mg/kg dry weight, 23.9 mg/kg dry weight and 143 mg/kg dry weight, respectively. The metals in the sediment had accumulated near the shoreline, up to fi ve kilometers away from the river mouth, indicating that terrestrial area and sediment fractions infl uenced their distribution.

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“…Nevertheless, groundwater inflows cannot be neglected because they impact sediment and water properties in the vicinity of discharge areas, espe cially salinity, therefore affecting planktonic and benthic communities. Groundwater discharges into saltmarshes are quite swift, being enhanced by bioturbation, decaying vegeta tion, and turbulence (Figure 17), and there is evidence that they interact with benthic boundary layer (Westbrook et al, 2002;Shi et al, 2006). The benthic boundary layer is composed by the water layer immediately adjacent to the bottom substrate.…”

Section: Hydrologic Control Of Benthic Communitiesmentioning

confidence: 99%