Muddy Coast Off Jiangsu, China: Physical, Ecological, and Anthropogenic Processes

Du, Jiabi; Shi, Benwei; Li, Jiasheng; Wang, Ya Ping

doi:10.1016/b978-0-12-811977-8.00003-0

Cited by 8 publications

(13 citation statements)

References 54 publications

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“…The comparison between runs S3 and REF further suggests that the sediment from outer sea is less efficient than those near the coast in forming of the RSRs. This result highlights the contribution of the littoral sediment transport to the development of the RSRs, such as the sediment supply from the Abandoned Yellow River Delta (as suggested by Du et al, ; Wang, Zhang, et al, ).…”

Section: Discussionsupporting

confidence: 61%

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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: Discussionsupporting

confidence: 61%

“…The major sediment source for the present‐day RSRs came from the Abandoned Yellow River Delta in the north (Du et al, ; Wang, Zhang, et al, ). However, run REF starts from equally distributed water depths (i.e., sediment supply) between the south and the north.…”

Section: Discussionmentioning

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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“…1). Tidal flats cover more than 90% of the 954 km long Jiangsu coast, with a relatively low gradient of around 1‰ (Du et al ., 2019). Mean tidal range is 3.9 to 5.5 m with a regularly semi‐diurnal tide (Wang et al ., 2012a).…”

Section: Regional Settingmentioning

confidence: 99%

A late Holocene shift of typhoon activity recorded by coastal sedimentary archives in eastern China

et al. 2021

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Frequency changes in intense typhoons are of great concern to modern society. However, current understanding of the influence of climate on typhoon activity on the millennial scale is restricted by the sparseness of preobservational reconstructions in the north-western Pacific. This study presents a 5500 year long typhoon record from the Jiangsu coast that provides the first >2 ka record in eastern China. Variations in the D90 grain size are the best predictor of recent typhoons in a second short high-resolution core. Comparison with other typhoon records from south-eastern China establishes a China millennial typhoon variability index during the middle to late Holocene, with maxima at ca 4750 AE 170, 3500 AE 220, 1500 AE 480 and 250 AE 170 yr BP and minima at ca 5200 AE 300, 4150 AE 430, 2600 AE 650 and 750 AE 270 yr BP. Peaks in typhoon activity in south-eastern China (compared with Japan) correlate with damped (enhanced) El Niño-Southern Oscillation and weak (strong) East Asian Summer Monsoon, indicating a seesaw pattern in typhoon activity between the two regions. A shift in typhoon frequency pattern was also identified around 2000 yr BP in south-eastern China, with subsequent more frequent typhoon activity. At that time there was sustained Atlantic Meridional Overturning Circulation reduction and its associated El Niño-Southern Oscillation enhancement, so Atlantic Meridional Overturning Circulation-driven El Niño-Southern Oscillation changes are likely to be the major cause of the significant increase in typhoon activity since 2000 yr BP, resulting in the 1500 AE 480 and 250 AE 170 yr BP China millennial typhoon variability peaks. To accurately predict changes in intense typhoon activity, it is therefore important to understand how the Atlantic Meridional Overturning Circulation and El Niño-Southern Oscillation will respond to future climate change.

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“…The human intervention caused mainly by land reclamation is the prominent feature of the shoreline changes in economically developed regions (Wu et al, 2016;Du et al, 2019). Economic development, population growth, and regional natural characteristics are attention-getting factors contributing to sequential coastal reclamations (Wu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…The abundant sediment supply from the Yangtze River (YZR) has aggravated coastal erosion/deposition and benefited the reclamation (Gao et al, 2013). Meanwhile, continuing reclamation depends largely on sediment accumulation rates on tidal flats (Du et al, 2019). The internal salt marsh systems attenuate hydrodynamics and reduce erosion, with more significant accumulation rates than bare flats.…”

Section: Introductionmentioning

confidence: 99%

Mapping the most heavily reclaimed shorelines of the Yangtze River delta urban agglomerations

et al. 2022

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Objectively understanding the characteristics and evolution of coastal geomorphology, and predicting the growth potential of intertidal flats are the prerequisites for the effective conservation and development of shoreline resources. However, the vulnerability of shorelines in the long term and large space scale needs to be assessed since human intervention in recent decades has intensified the double oppression of river delta system transformation and land reclamation. The Yangtze River Delta Urban Agglomerations (YRDUA) is a highly developed global economy, therefore, the YRDUA with the most intense reclamation, and their dynamic shoreline changes before and after the sharply decreasing sediment supply were detected based on 4,596 remote sensing images and corresponding hydrodynamic data. We found that the sediment replenishment from the radial sand ridges on the middle Jiangsu Coast made the shoreline expansion rate reach 4–5 times that of other Jiangsu coasts. Specifically, a close correlation between the shoreline accretion rate and the amount of sediment supply was found on the eastern Chongming Wetland. Generally, there were still sufficient sediments on the Yangtze River Estuary and Hangzhou Bay interface to support the shoreline expansion despite the upstream sediment reduction. The longshore sediment transport from the delta-front erosion and the land reclamation including vegetation ecological responses were the main factors promoting the shoreline advance. Human interventions, dominated mainly by reclamation, formed positive feedback with local hydrodynamic processes and promoted continuous shoreline accretion. This study focused on the external and internal drivers and their interactions of long-term shoreline evolution with very intensive human activities, which can provide the decision-making reference for the regional coastal zone management and conservation.

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Muddy Coast Off Jiangsu, China: Physical, Ecological, and Anthropogenic Processes

Cited by 8 publications

References 54 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

A late Holocene shift of typhoon activity recorded by coastal sedimentary archives in eastern China

Mapping the most heavily reclaimed shorelines of the Yangtze River delta urban agglomerations

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