The Effect of Reclamation in Areas Between Islands in a Complex Tidal Estuary on the Hydrodynamic Sediment Environment

Meng-guo, LI

doi:10.1016/s1001-6058(09)60063-9

Cited by 21 publications

(5 citation statements)

References 3 publications

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“…The Oujiang River and the Feiyunjiang River flow into the sea to the north and the south of the Oufei tidal flat, respectively. The annual average discharge of the Oujiang River is 470 m 3 /s, and that of the Feiyunjiang River is 75 m 3 /s (Li, 2010). A large amount of sediment from the Yangtze Estuary is transported to the offshore area of the Oufei tidal flat by longshore currents.…”

Section: Study Areamentioning

confidence: 99%

Impacts of tidal flat reclamation on suspended sediment dynamics in the tidal-dominated Wenzhou Coast, China

Zhang

Chen

et al. 2023

Front. Mar. Sci.

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Reclamation of tidal flats is one of the engineering measures of expanding land area and developing the economy in coastal areas; however, this process disturbs the natural processes of the tidal flat system. Taking the flood-tidal dominant Oufei tidal flat at the Wenzhou coast as a study area, the influences of tidal flat reclamation on tidal and suspended sediment dynamics were comprehensively investigated via numerical modeling. Before the reclamation, the Eulerian residual current flows alongshore and the residual sediment transport on-shore in the tidal flat area. The reclamation reduces the tidal flat area, shifting the M4 co-phase line toward the coast and squeezing the flood-dominated area. Consequently, the tidal current is weakened and the suspended sediment concentration (SSC) is reduced, but the residual sediment transport change insignificantly. The residual sediment transport in the Feiyunjiang Estuary is controlled by the tidal pumping effect. The upper estuary shows a net sediment transport landward, while a seaward transport is observed in the lower estuary, which further splits into two circulation outside the estuary. The south Oufei dike construction interferes the northern sediment circulation, resulting in the alteration of local SSC and enhancing landward sediment transport inside the estuary. The methodology and understandings arising from this study could be a good reference for the analysis of suspended sediment transport under tidal flat reclamation effects at other sites.

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Section: Study Areamentioning

confidence: 99%

Impacts of tidal flat reclamation on suspended sediment dynamics in the tidal-dominated Wenzhou Coast, China

Zhang

Chen

et al. 2023

Front. Mar. Sci.

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“…It also changes the dynamic geomorphology pattern of estuaries and increases the potential risks of the coastal zone. Estuarine engineering projects have been widely reported to exert instant impacts on hydrodynamics, and morphodynamics, consequently attracting intensive research attention (Park and Park 1998;Li 2010;Shin et al 2019;Guo et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Impacts of land reclamation projects on hydrodynamics and morphodynamics in the highly altered North Branch of the Changjiang Estuary

Zhang

Fan

Feng

et al. 2022

Anthropocene Coasts

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The estuary is highly dynamic and sensitive to external and internal forcing. We examine a chain reaction of hydrodynamic and morphodynamic responses to a series of land reclamation projects during the period 1997 to 2017 in the North Branch of the Changjiang Estuary through the Digital Elevation Model (DEM) comparison and the numerical simulation by the Finite Volume Community Ocean Model (FVCOM). The results show that tidal amplification was further strengthened by the artificially reduced channel volume in the middle and upper segments of the North Branch due to the implementation of several large-scale land-reclamation projects in the first stage (1997–2007), and the channel siltation in the middle and upper segments was in turn further promoted by the increased tidal flows with flood dominance. In the second stage (2007–2017), tidal amplification was relaxed by the channel narrowing project at the lower segment and the waterway improvement project through channel dredging works at the middle and upper segments. Contemporary erosion volume was almost balanced by the accretion volume in the North Branch because of the weakening dominance of flood over ebb flows. Spatiotemporal variation in channel accretion and erosion patterns in response to estuarine engineering projects was vividly mirrored by the change of simulated bed shear stress in that the areas with increased (decreased) bed shear stress underwent severe erosion (accretion). These findings highlight again the dynamic feature of tide-dominated estuaries and the importance of simulation tools to the estuarine management.

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“…At present, many research results have been published about the hydrodynamic environmental variation after the projects have been done because all kinds of marine projects have been implemented 10 , 11 . In the coastal and estuarine waters, the tidal current is the main dynamical factors 12 . Numerical simulation of hydrodynamics is widely applied in studies of coastal and estuarine problem 13 , 14 .…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the impact of an integrated renovation project on the Maowei Sea hydrodynamic environment

Wang

Cai

et al. 2021

Sci Rep

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Integrated renovation projects are important for marine ecological environment protection. Three-dimensional hydrodynamics and water quality models are developed for the Maowei Sea to assess the hydrodynamic environment base on the MIKE3 software with high resolution meshes. The results showed that the flow velocity changed minimally after the project, decreasing by approximately 0.12 m/s in the east of the Maowei Sea area and increasing by approximately 0.01 m/s in the northeast of the Shajing Port. The decrease in tidal prism (~ 2.66 × 106 m3) was attributed to land reclamation, and accounted for just 0.86% of the pre-project level. The water exchange half-life increased by approximately 1 day, implying a slightly reduced water exchange capacity. Siltation occurred mainly in the reclamation and dredging areas, amounting to back-silting of approximately 2 cm/year. Reclamation project is the main factor causing the decrease of tidal volume and weakening the hydrodynamics in Maowei Sea. Adaptive management is necessary for such a comprehensive regulation project. According to the result, we suggest that reclamation works should strictly prohibit and dredging schemes should optimize in the subsequent regulation works.

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The Effect of Reclamation in Areas Between Islands in a Complex Tidal Estuary on the Hydrodynamic Sediment Environment

Cited by 21 publications

References 3 publications

Impacts of tidal flat reclamation on suspended sediment dynamics in the tidal-dominated Wenzhou Coast, China

Impacts of tidal flat reclamation on suspended sediment dynamics in the tidal-dominated Wenzhou Coast, China

Impacts of land reclamation projects on hydrodynamics and morphodynamics in the highly altered North Branch of the Changjiang Estuary

Numerical simulation of the impact of an integrated renovation project on the Maowei Sea hydrodynamic environment

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