Hydrology, sediment circulation and long-term morphological changes in highly urbanized Shenzhen River estuary, China: A combined field experimental and modeling approach

Zhang, Shiyan; Mao, Xufei

doi:10.1016/j.jhydrol.2015.08.027

Cited by 19 publications

(4 citation statements)

References 39 publications

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“…It means the tidal current in this area is in the tendency switching from ebb dominance to flood dominance, which favors net landward sediment transport [29]. Zhang and Mao argued that human activities in Deep Bay aggravated the severe sediment deposition further [55], which agrees well with our findings here. In order to ascertain the influence of the shoreline changes in Deep Bay on asymmetry and the intrinsic mechanism, the points A and B (positions shown in the Figure 1b) have been selected for comparison (Table 1).…”

Section: Effect Of the Shoreline Change On The Fvasupporting

confidence: 90%

On the Mechanism behind the Variation of the Tidal Current Asymmetry in Response to Reclamations in Lingding Bay, China

Huang

Zhang

et al. 2022

JMSE

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Tidal current asymmetry, an important factor for waterborne substance transport, is strongly affected by the changing shoreline. Lingding Bay (LDB), located in the center of the Guangdong-Hong Kong-Macao Greater Bay Area, has suffered great shoreline changes since the 1970s. A well-validated numerical model is built to investigate how the changing shoreline impacts tidal current asymmetry, which is quantified by the skewness parameter. Two types of tidal current asymmetries, the flow velocity asymmetry (FVA) and the flow duration asymmetry (FDA), are considered here. Despite their different dominant combinations, the two asymmetries display a similar tendency from the mouth to the head of the LDB. When the shoreline changes due to successive land reclamation are taken into consideration, the FVA and the FDA alter correspondingly. The results suggest that the shoreline change shifts the FVA in Deep Bay (a side embayment of LDB) from ebb dominance to flood dominance, because of the changes of its dominant constituent combinations (K1/O1/M2 and the residual current). As the shoreline propagates seaward, the increasing contributions of M2/M4 and M2/S2/MS4 enlarge the water area of positive FDA (i.e., shorter duration of low water slack) in LDB. Analyses of tidal current asymmetries in Lingding Bay show that tidal current asymmetry has been enhanced by sustained land reclamation and will further impact sediment transport in the bay.

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Section: Effect Of the Shoreline Change On The Fvasupporting

confidence: 90%

On the Mechanism behind the Variation of the Tidal Current Asymmetry in Response to Reclamations in Lingding Bay, China

Huang

Zhang

et al. 2022

JMSE

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“…Shenzhen River is the most polluted river flowing into Shenzhen Bay. The oyster-culturing area and the control area are mainly effected by the Shenzhen River, and their hydrodynamic conditions are similar [46].…”

Section: Discussionmentioning

confidence: 99%

Assembly of a Benthic Microbial Community in a Eutrophic Bay with a Long History of Oyster Culturing

Song

et al. 2021

Microorganisms

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The introduction of oysters to a waterbody is an efficient method for decreasing levels of eutrophication. Oysters affect sedimental environments and benthic microbes via their roles in nutrient cycling. However, little is known about how long-term oyster culturing affects benthic microbial community assembly. In the present study, top and bottom sediments from an oyster-culture area and non-culture area, in a eutrophic bay with a long history of oyster culturing, were obtained for environmental parameter measurement and microbe identification. Deterministic and stochastic processes in microbial community assembly were assessed. In particular, keystone species identification through network analysis was combined with measured environmental parameters to determine the factors related to community assembly processes. Our results suggest that oyster culturing relates to greater variation in both biological and non-biological sediment profiles. In benthic communities, Proteobacteria and Chloroflexi were the most abundant phyla, and community compositions were significantly different between sample groups. We also found that community assembly was more affected by deterministic factors than stochastic ones, when oysters were present. Moisture, or water content, and pH were identified as affecting deterministic and stochastic processes, respectively, but only water content was a driver associated with oyster culturing. Additionally, although keystone species presented a similar pattern of composition to peripheral species, they responded to their environments differently. Furthermore, model selection, fitting keystone species to community assembly processes, indicates their role in shaping microbial communities.

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“…The ETM is a prominent manifestation of the sedimentary dynamic environment of the estuary. The higher turbidity often causes the siltation of the navigation channel (De Nijs et al, 2009;De Swart et al, 2009;Garnier et al, 2010;Zhang and Mao, 2015;Orseau et al, 2017), which directly affects the evolution of the channel-shoal system. Understanding the three-dimensional dynamics of the ETM is of great scientific significance for planning the construction of hydraulic structures, solving the siltation of waterways and harbor basins, rationally exploring resources and protecting the ecosystem (Holt and James, 1999;Liu et al, 2002;Little et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Exploring the three-dimensional flow-sediment dynamics and trapping mechanisms in a curved estuary: The role of salinity and circulation

Tao

Zhu

2022

Front. Mar. Sci.

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Combined with the observed data in the wet season in June 2015, structures of longitudinal and lateral residual current and characteristics of the estuarine turbidity maximum (ETM) in the Yongjiang estuary (YE) are studied using a three-dimensional baroclinic flow and sediment numerical model. The mechanisms of residual current and sediment trapping are investigated according to the momentum balance analysis and sediment transport decomposition. The results show that at spring tide, the outflowing longitudinal residual current is dominated by longitudinal advection and barotropic pressure gradient. At neap tide, a remarkable baroclinic effect emerges at the bottom of the river mouth area, driving the landward residual current and forming the estuarine circulation. Lateral residual current at upstream bends with lower salinity is dominated by longitudinal advection and barotropic pressure gradient. The flow directs toward the concave bank at the surface and toward the convex bank near the bottom at these sections. At downstream bends with higher salinity, the lateral residual current is greatly affected by the baroclinic gradient, which will shift the lateral flow circulation structure. In transition straight reaches located at Qingshuipu and Zhenhai, the lateral residual current presents a double-cell circulation with surface convergence and bottom divergence. During spring tide, the ETM is located near Qingshuipu, driven by landward tidal pumping transport due to the strong tidal energy. During neap tide, a strong exchange flow generates landward circulation transport around the river mouth, and the ETM moves downstream to Zhenhai. At bends, sediment along the cross section is laterally trapped on the convex bank, driven by bottom lateral flow induced circulation transport. While in transition straight reaches, high turbidity is still concentrated in the deep groove, caused by bottom divergent flow and circulation transport.

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Hydrology, sediment circulation and long-term morphological changes in highly urbanized Shenzhen River estuary, China: A combined field experimental and modeling approach

Cited by 19 publications

References 39 publications

On the Mechanism behind the Variation of the Tidal Current Asymmetry in Response to Reclamations in Lingding Bay, China

On the Mechanism behind the Variation of the Tidal Current Asymmetry in Response to Reclamations in Lingding Bay, China

Assembly of a Benthic Microbial Community in a Eutrophic Bay with a Long History of Oyster Culturing

Exploring the three-dimensional flow-sediment dynamics and trapping mechanisms in a curved estuary: The role of salinity and circulation

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