The driving effect of human activities on the evolution of the Nanhui Shoal in the Yangtze River estuary

Li Yuhan; Guo Xingjie; Li Linjiang; Lu Xuejun

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Li Yuhan，Guo Xingjie，Li Linjiang, et al. The driving effect of human activities on the evolution of the Nanhui Shoal in the Yangtze River estuary[J]. Haiyang Xuebao，2025, 47(x)：1–11

Citation:

Li Yuhan，Guo Xingjie，Li Linjiang, et al. The driving effect of human activities on the evolution of the Nanhui Shoal in the Yangtze River estuary[J]. Haiyang Xuebao，2025, 47(x)：1–11

Citation:

Li Yuhan，Guo Xingjie，Li Linjiang, et al. The driving effect of human activities on the evolution of the Nanhui Shoal in the Yangtze River estuary[J]. Haiyang Xuebao，2025, 47(x)：1–11

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The driving effect of human activities on the evolution of the Nanhui Shoal in the Yangtze River estuary

1.
School of Marine Science, Shanghai Ocean University, Shanghai 201306 China
2.
Shanghai Institute of Natural Resources Investigation and Utilization, Shanghai 200072 China
3.
Shanghai Typhoon Research Institute of China Meteorological Administration, Shanghai 200030
4.
Shanghai Marine Management Affairs Center, Shanghai 200124

Received Date: 2024-12-02
Rev Recd Date: 2025-04-03

Available Online: 2025-05-20

Abstract

Abstract

For the past two thousand years, the southern bank of the Yangtze River estuary has basically shown an evolutionary trend of "Shoal extension", with a rate of about 1 km of siltation and development towards the sea every 40 years. It is the most important land growth area and tidal wetland resource in Shanghai, and the research significance is significant. This paper studies the evolution characteristics of Nanhui Shoal in the past 60 years based on indicators such as scouring and silting characteristics, isobath changes and mudflat migration rate from 1958 to 2019, and discusses its growth mode, driving factors and development trend through space-time comparison. The results showed that: (1) From 1958 to 2019, the Nanhuibian Shoal exhibited four stages of gradual siltation, rapid siltation, near siltation and far erosion, and comprehensive erosion. During this stage, the fastest siltation and erosion rates were 460 m/a and 270 m/a, respectively. (2) Human activities have become the main controlling factors affecting the evolution of the Nanhui Shoal at the mouth of the Yangtze River. Among them, variable factors such as watershed dam construction, Yangtze River estuary bifurcation control engineering, Shoal reclamation and land reclamation, and channel dredging and sand mining have greatly affected the evolution of the Nanhui Shoal. The correlation between Shoal reclamation and terrain evolution is strong, with a correlation coefficient of 0.73. (3) With the strict control of land reclamation by the government and Shanghai, the Nanhui Beach will gradually reach a new balance of erosion and deposition in the future. It is recommended to study the protection and management measures of estuarine tidal wetlands as soon as possible to cope with possible coastal disasters in the future.
- Yangtze River estuary,
- Nanhui Shoal,
- human activity,
- siltation and swelling,
- erosion,
- engineering

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References(42)

References

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