Evolution of sedimentary dynamic environment in the western Jiaozhou Bay, Qingdao, China in the last 30 years

Ke, Zhao; Qiao, Lulu; Shi, Jianghong; He, Shuqin; Li, Guangxue; Yin, Ping

doi:10.1016/j.ecss.2014.12.011

Cited by 24 publications

(11 citation statements)

References 15 publications

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“…It might be related to the barrier function of the bridge, where the river runoff met the weak tidal power of the sea, and the sediment transport direction was deflected clockwise to the east. As confirmed by many studies, there was net sediment transport towards the South-southeast in the shallow sea area of the Northwest of the Jiaozhou Bay due to the rectilinear current that dominated in the bay [35].…”

Section: Metals Transportmentioning

confidence: 60%

“…The tidal current velocity of the flood tide is greater than that of the ebb tide, which is generally 10-15 cm/s in the bay. Since the 1980s, the construction of dams or reservoirs in river basins and climate change has dramatically reduced river loads [33], resulting in bay sediment transport that is mainly affected by tidal currents [35]. The Jiaozhou Bay Bridge with a total length of 26.7 km was built in 2011, across the east and west coasts of the Jiaozhou Bay ( Figure 1).…”

Section: Study Areamentioning

confidence: 99%

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Distribution, Enrichment and Transport of Trace Metals in Sediments from the Dagu River Estuary in the Jiaozhou Bay, Qingdao, China

et al. 2019

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26 river bank sediments and 15 estuary seafloor sediments were sampled from the Dagu River and the estuary of Northwestern Jiaozhou Bay to determine contaminations of heavy metals and metalloids (Cu, Pb, Zn, Cr, Cd, Hg and As). The trace metal contents in sediment from the estuary area were much higher than those of the river. Correlation analysis showed that except for Pb, the metals were mainly controlled by the grain size, and enriched by adsorption of aluminosilicate minerals, Fe/Mn oxides and organic matter in river and estuary sediments. In addition to Cu in some stations, the metals met the requirements of the marine organism and humans for the quality of the marine environment. The concentrations of Cu, Pb, Cr, Hg and As were between the threshold effect level (TEL) and probable effect level (PEL), indicating those metals might have occasional adverse effects. Results of Enrichment Factor values revealed that the entire study area was enriched in Pb and Hg, at moderate environmental risk, but the estuary was more significant. Pb and Hg contaminations in this area were mainly from coal combustion and automobile emissions. River runoff and atmospheric deposition dominated the metals distribution and enrichment in the study area. Contaminants in sediments entering the estuary were further transported to the south and east under the river runoff and reciprocating current in the Jiaozhou Bay.

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Section: Metals Transportmentioning

confidence: 60%

Section: Study Areamentioning

confidence: 99%

Distribution, Enrichment and Transport of Trace Metals in Sediments from the Dagu River Estuary in the Jiaozhou Bay, Qingdao, China

et al. 2019

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“…The model used in this study was based on the MIKE 3 hydrodynamic module by the Danish Hydraulic Institute, which is developed for a wide range of applications in areas such as oceans, coastal regions, estuaries, and lakes (Dai et al, ; Danish Hydraulic Institute [DHI], ; Gao et al, ; Qiao, Zhong, et al, ; Wang et al, ; Warren & Bach, ; Zhao et al, ). The Hydrodynamic Module is based on the three‐dimensional (3‐D) incompressible Reynolds‐averaged Navier–Stokes equations and adopts Boussinesq approximation and hydrostatic assumption (DHI, ).…”

Section: Methodsmentioning

confidence: 99%

Variation in the Current Shear Front and Its Potential Effect on Sediment Transport Over the Inner Shelf of the East China Sea in Winter

Liu

Qiao

et al. 2018

JGR Oceans

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The current shear fronts (CSFs) in the East China Sea have been observed during winter in previous studies. In this research, we systematically study characteristics and variation mechanism of the CSFs and its potential effects on the transport of water and suspended sediment and on the inner shelf mud area (ISMA), using the methods of observation data analysis and numerical simulation. The spatial structures, shear intensities, and sea‐land locations of the CSFs are obviously affected by wind, temperature and salinity. The CSFs curve seaward due to the nonuniformity of topography, and the tide causes its periodic and sea‐land shift. The landward U component near the CSFs indicate little cross‐CSF transport (i.e., the barrier effect). The CSFs are important hydrodynamic factors that affect the formation of the ISMA. The periodic shift of the CSFs in the longitudinal direction and its variations in spatial structure are the main mechanisms affecting the spatial distribution and thickness of the ISMA. However, the barrier effect of the CSFs can be interrupted, and both the strong wind in the northeast direction and baroclinic conditions are beneficial for cross‐CSF transport. Furthermore, cross‐CSF transports occur in the upper layers under northwest wind condition, in areas with nonuniformity of topography and during the spring tide period. Three cross‐shelf channels are identified in areas where the CSFs curve seaward resulting from nonuniformity of topography.

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“…A cross-sea bridge is an important transportation junction connecting various cities and economic zones. However, the construction and operation of a cross-sea bridge also has an impact on the marine environment, including the hydrodynamic environment [1,2], sediment [3,4] and sea surface temperature (SST) [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…The numerical simulation of the tidal dynamic change at Qingdao Jiaozhou Bay Bridge was performed using an unstructured finite volume ocean model-FVCOM [1], and prior researchers discovered that when the tide was rising and ebbing, the flow velocity increased between two adjacent sets of piers, while the flow velocity decreased around the piers. Based on MIKE 21 Flow Modules by Danish Hydraulic Institute (DHI), Zhao et al [2] found that the different water levels on both sides of the cross-sea bridge can induce a barotropic current, increasing the flow velocity north of the bridge and decreasing the southern flow velocity.…”

Section: Introductionmentioning

confidence: 99%

Satellites HY-1C and Landsat 8 Combined to Observe the Influence of Bridge on Sea Surface Temperature and Suspended Sediment Concentration in Hangzhou Bay, China

Huang

Liu

Cai

et al. 2020

Water

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We analyzed the influence of a cross-sea bridge on the sea surface temperature (SST) and suspended sediment concentration (SSC) of Hangzhou Bay based on landsat8_TIRS data and HY-1C data using an improved single window algorithm to retrieve the SST and an empirical formula to retrieve the SSC. In total, 375 paired sampling points and 70 transects were taken to compare the SST upstream and downstream of the bridge, and nine transects were taken to compare the SSC. The results show the following. (i) In summer, when the current flows through the bridge pier, the downstream SST of the bridge decreases significantly, with a range of 3.5%; in winter, generally, the downstream SST decreases but does not change as obviously as in summer. The downstream SSC increases obviously. (ii) The range of influence of the bridge pier on the downstream SST is about 0.3–4.0 km in width from the bridge and that on the downstream SSC is approximately 0.3–6.0 km. (iii) When the current flows around the pier, a portion of the flow is dispersed in upward and downward directions; the downward flow generates local scour. When the scouring at the front end of the pier stops, the upward flow behind the pier brings the sediment and the bottom cold water downstream, causing the downstream SST to decrease and the SSC to increase. (iv) The other portion passes around the pier, which generates a wake vortex. Once a wake vortex is released, a low-pressure center appears, sucking the sediment and the bottom cold water to the downstream sea surface, reducing the downstream SST and raising the SSC. (v) The range of reduction of the SST downstream of the bridge is shorter than the range of increase in the SSC. This is because the wake vortices have an effect in the 0.3–4.0 km downstream but not in the 4.0–6.0 km. Therefore, the SST and SSC are affected within the range of 0.3–4.0 km by wake vortices, while in the 4.0–6.0 km region, the SSC is still high due to the transport of sediment by currents.

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Evolution of sedimentary dynamic environment in the western Jiaozhou Bay, Qingdao, China in the last 30 years

Cited by 24 publications

References 15 publications

Distribution, Enrichment and Transport of Trace Metals in Sediments from the Dagu River Estuary in the Jiaozhou Bay, Qingdao, China

Distribution, Enrichment and Transport of Trace Metals in Sediments from the Dagu River Estuary in the Jiaozhou Bay, Qingdao, China

Variation in the Current Shear Front and Its Potential Effect on Sediment Transport Over the Inner Shelf of the East China Sea in Winter

Satellites HY-1C and Landsat 8 Combined to Observe the Influence of Bridge on Sea Surface Temperature and Suspended Sediment Concentration in Hangzhou Bay, China

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