Mechanisms of maintaining high suspended sediment concentration over tide-dominated offshore shoals in the southern Yellow Sea

Xiong, Jilian; Wang, Xiaohua; Wang, Ya Ping; Chen, Jingdong; Shi, Benwei; Gao, Jianhua; Yang, Yang; Yu, Qian; Li, Mingliang; Lei, Yongmei; Gong, Xiao

doi:10.1016/j.ecss.2017.04.023

Cited by 40 publications

(22 citation statements)

References 34 publications

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“…The radial tidal current fields are governed by the convergence of a progressive tidal bulge from the East China Sea and a local reflected tidal “wave” formed by the obstruction of the Shandong Peninsula (Zhang et al, ; see also Qian et al, ; Xu et al, ). Other dynamics, such as waves (Xiong et al, ) and storm surges (Ren et al, ), are considered to be less relevant to the radial morphology of the RSRs, although they can induce considerable short‐term sediment transport.…”

Section: Introductionmentioning

confidence: 99%

A Morphodynamic Modeling Study on the Formation of the Large‐Scale Radial Sand Ridges in the Southern Yellow Sea

et al. 2019

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The radial sand ridges (denoted as "RSRs" hereafter) in the Southern Yellow Sea, China, are morphologically striking because of the remarkable size and radial planar orientation, standing out as a unique coastal geomorphology among the worldwide sand ridge systems. The formation of this giant fan-shaped geomorphic feature requires delicate conditions and awaits in-depth investigation. Using an idealized morphodynamic model, this study unravels the governing factors for the formation of the unique large-scale RSRs, in comparison with other types of sand ridge systems over the world. The effects of the M 2 tidal constituent, the Coriolis forcing, the bed resistance, and the initial water depths on the morphodynamic behavior of the RSRs are explored. Numerical results indicate that the tidal regime, characterized by rotational and progressive current action associated with the tidal bulge, is dependent on the eastern coastline of China as well as latitudinal effects. Through the comparison between the simulated and the measured morphology, this tidal regime is demonstrated to be the key driver in forming and maintaining the present-day RSRs. The runs with different parameters further suggest that the asymmetric pattern of the RSRs, which shows larger northern sand ridges than the southern ones, results from both the asymmetric distribution of current activity caused by the tidal bulge and unequal sediment supply. Overall, this study highlights the delicate condition, predominantly represented by the particular currents set up by the tidal wave system and the sediment supply, required to shape the striking large-scale RSRs in the Southern Yellow Sea. Key Points:• The unique giant fan-shaped morphology of the radial sand ridges (RSRs) is numerically simulated • The formation of the RSRs requires delicate conditions governed by currents originating from the rotational, progressive tidal wave system • The mechanism underlying the asymmetric spatial pattern of the RSRs is revealed Supporting Information:• Supporting Information S1

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Section: Introductionmentioning

confidence: 99%

A Morphodynamic Modeling Study on the Formation of the Large‐Scale Radial Sand Ridges in the Southern Yellow Sea

et al. 2019

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“…The mean velocities during flood and ebb current do not differ significantly [58]. Due to the complex topography between ridges and channels, waves have a limited fetch and only limitedly propagate into the tidal channels, and local wave heights are therefore small [59][60][61]. The wind and wave field varies seasonally, with larger wave heights during winter than in summer [62].…”

Section: The Jiangsu Coast and Tongzhou Baymentioning

confidence: 99%

Building for Nature: Preserving Threatened Bird Habitat in Port Design

Muller

Chan

Piersma

et al. 2020

Water

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The fast economic development of the People’s Republic of China has created an increasing demand for usable land, resulting in large-scale land reclamations along the coastal zone. One of these regions is Tongzhou Bay (Jiangsu coast), a region characterized by large intertidal mudflats and deep tidal channels with potential for the development of agri-aquaculture and the construction of a deep-sea port. However, these intertidal mudflats also provide vital ecosystem services and support many wildlife species, including several endangered migratory shorebirds within the East Asian–Australasian Flyway. With increasing realization of the importance of maintaining such ecological values, a more integrated coastal development strategy is needed. This study aims to develop a sustainable integrated design for the Tongzhou Bay port, following a “Building with Nature” approach. We use a morphodynamic model to compute habitat suitability for two shorebird species (Great Knot Calidris tenuirostris and Bar-tailed Godwit Limosa lapponica). Several port configurations were developed on the basis of three design criteria: (1) create area for future port development, whilst (2) preserving existing high-value ecotopes for shorebirds and (3) enhance the natural accretion rate of such ecotopes. Simulation results showed a clear difference in siltation patterns, preservation and enhancement of preferred ecotopes. This work therefore demonstrates the potential and importance of morphological and habitat suitability modelling when designing large-scale reclamations and port constructions, especially in dynamic areas such as Tongzhou Bay.

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“…These correlations enable us to convert the SNR data recorded by the ADV and the turbidity data recorded by the ECM into time-series SSC data. Such method has been widely used in previous studies with satisfactory results (Salehi and Strom 2012;Wang and Ye 2013;Wei et al 2013;Xiong et al 2017).…”

Section: Sample Collection and Analysismentioning

confidence: 99%

The erosion—deposition process and associated control mechanisms of the Nanliu River subaqueous delta, Southern China coast

Zhen-kun

Wang

Xiang

2019

Anthropocene Coasts

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Understanding the erosion–deposition process of sediments and the associated controlling mechanisms in subaqueous deltas is important for coastal environment protection. In this study, field observations and numerical simulations were performed for the Nanliu River subaqueous delta in Guangxi Province (Southern China) to investigate the sediment dynamic processes at the bottom boundary layer. The results show that the sediment resuspension mainly occurs during periods of spring tides and is mainly controlled by the wave action. When the seabed is free from erosion, suspended sediment settling caused by lateral transport is an important source of maintaining near bed suspended sediment concentration. It was also found that increasing the shear parameter could facilitate the formation of flocs, after which the small flocs tend to merge to large flocs. Finally, by performing a consistency analysis between the seabed erosion and deposition processes obtained from numerical simulation, and the changes of seabed level recorded by the equipment during the field observation, we determined that the local erosion coefficient was 5 × 10−5 kg/m2·s. The one-dimensional simulation is also capable of revealing the general trend at the seabed where it is first subjected to erosion and then deposition, as indicated during the field measurements.

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Mechanisms of maintaining high suspended sediment concentration over tide-dominated offshore shoals in the southern Yellow Sea

Cited by 40 publications

References 34 publications

A Morphodynamic Modeling Study on the Formation of the Large‐Scale Radial Sand Ridges in the Southern Yellow Sea

A Morphodynamic Modeling Study on the Formation of the Large‐Scale Radial Sand Ridges in the Southern Yellow Sea

Building for Nature: Preserving Threatened Bird Habitat in Port Design

The erosion—deposition process and associated control mechanisms of the Nanliu River subaqueous delta, Southern China coast

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