South Flank of the Yangtze Delta: Past, present, and future

Fan, Daidu; Wu, Yijing; Zhang, Yue; Burr, George S.; Huo, Miao; Li, Jing

doi:10.1016/j.margeo.2017.08.015

Cited by 62 publications

(30 citation statements)

References 63 publications

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“…1), and extensive flooding occurred in the coastal floodplain due to levee breach (Liu 2008). To protect against evolving coastal floods, flood defense system in Lingang were constructed and reinforced several times over the past decades (Fan et al 2017). In the 1970s, '85' (i.e., 8 m height and 5 m width levee crest) seawall has been built in response to an extreme coastal flood event that occurred in August 1974.…”

Section: Study Areamentioning

confidence: 99%

Long-term flood-hazard modeling for coastal areas using InSAR measurements and a hydrodynamic model: The case study of Lingang New City, Shanghai

Yin

Zhao

et al. 2019

Journal of Hydrology

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In this paper, we study long-term coastal flood risk of Lingang New City, Shanghai, considering 100-and 1000-year coastal flood return periods, local seal-level rise projections, and long-term ground subsidence projections. TanDEM-X satellite data acquired in 2012 were used to generate a high-resolution topography map, and multi-sensor InSAR displacement time-series were used to obtain ground deformation rates between 2007-2017. Both data sets were then used to project ground deformation rates for the 2030s and 2050s. A 2-D flood inundation model (FloodMap-Inertial) was employed to predict coastal flood inundation for both scenarios. The results suggest that the sea-level rise, along with land subsidence, could result in minor but non-linear impacts on coastal inundation over time. The flood risk will primarily be determined by future exposure and vulnerability of population and property in the floodplain. Although the flood risk estimates show some uncertainties, particularly for long-term predictions, the methodology presented here could be applied 2 to other coastal areas where sea level rise and land subsidence are evolving in the context of climate change and urbanization.

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Section: Study Areamentioning

confidence: 99%

Long-term flood-hazard modeling for coastal areas using InSAR measurements and a hydrodynamic model: The case study of Lingang New City, Shanghai

Yin

Zhao

et al. 2019

Journal of Hydrology

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“…The narrow land-ocean interface zone also provides the highest primary productivity that supports the richest biodiversity and the highest fishery production in the world's oceans. Attracted by the abundance of fertile agricultural lowlands and fishery resources, humans began to settle along the coastal zone in the Mid-Holocene when global sealevel rise slowed down (Fan et al 2017). Today, the coasts of the world have developed into global socioeconomic hubs to accommodate nearly 50% of global population on merely 12% of Earth's surface (Crossland et al 2005).…”

Section: Coastal Environmental Changes Under Increasing Anthropogenicmentioning

confidence: 99%

“…Finally, ocean warming and acidification induced by Anthropocene CO 2 release will continue to exert influence on marine biology. Under these pressures, low-lying mega-river delta plains have been evaluated as the world's most vulnerable regions in response to global climate change (Syvitski et al 2009;Fan et al 2017). The increasing ecological degradation in large-river delta-front estuaries has attracted great concern from academics and the general public because of drastically spreading eutrophication and hypoxia in the world's oceans during the past decades (Diaz and Rosenberg 2008;Bianchi et al 2010).…”

Section: Coastal Environmental Changes Under Increasing Anthropogenicmentioning

confidence: 99%

Coastal environmental changes under increasing anthropogenic impacts: an introduction

2019

Anthropocene Coasts

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“…At a smaller spatial scale, the shoals and tidal flats in the mouth zone are accreting, including the eastern Chongming flat (Yang et al, 2008), Nanhui shoal (Fan et al, 2017;Wei et al, 2017), Jiuduan shoal (Gao et al, 2010;Wei et al, 2015;Li et al, 2016) and Hengsha flat (Wei et al, 2015). Although the accretion rates of some shoals and tidal flats typically decrease (Yang et al, 2008;Wei et al, 2015), erosion has not yet been observed.…”

Section: Introductionmentioning

confidence: 99%

Decadal morphological evolution of the mouth zone of the Yangtze Estuary in response to human interventions

Zhu

Guo

Maren

et al. 2019

Earth Surf Processes Landf

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The morphology of the Yangtze Estuary has changed substantially at decadal time scales in response to natural processes, local human interference and reduced sediment supply. Due to its high sediment load, the morphodynamic response time of the estuary is short, providing a valuable semi‐natural system to evaluate large‐scale estuarine morphodynamic responses to interference. Previous studies primarily addressed local morphologic changes within the estuary, but since an overall sediment balance is missing, it remains unclear whether the estuary as a whole has shifted from sedimentation to erosion in response to reduced riverine sediment supply (e.g. resulting from construction of the Three Gorges Dam). In this paper we examine the morphological changes of two large shoals in the mouth zone (i.e. the Hengsha flat and the Jiuduan shoal) using bathymetric data collected between 1953 and 2016 and a series of satellite images. We observe that the two shoals accreted at different rates before 2010 but reverted to erosion thereafter. Human activities such as dredging and dumping contribute to erosion, masking the impacts of sediment source reduction. The effects of local human intervention (such as the construction of a navigation channel) are instantaneous and are likely to have already resulted in new dynamic equilibrium conditions. The morphodynamic response time of the mouth zone to riverine sediment decrease is further suggested to be >30 years (starting from the mid‐1980s). Accounting for the different adaptation time scales of various human activities is essential when interpreting morphodynamic changes in large‐scale estuaries and deltas. © 2019 John Wiley & Sons, Ltd.

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South Flank of the Yangtze Delta: Past, present, and future

Cited by 62 publications

References 63 publications

Long-term flood-hazard modeling for coastal areas using InSAR measurements and a hydrodynamic model: The case study of Lingang New City, Shanghai

Long-term flood-hazard modeling for coastal areas using InSAR measurements and a hydrodynamic model: The case study of Lingang New City, Shanghai

Coastal environmental changes under increasing anthropogenic impacts: an introduction

Decadal morphological evolution of the mouth zone of the Yangtze Estuary in response to human interventions

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