The response of morphplogy and sediment characteristics to human modification in an estuarine tidal flat

Xie Weiming; He Qing; Zhang Dai; Zhu Lei; Guo Leicheng; Wang Xianye

doi:10.3969/j.issn.0253-4193.2019.05.011

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Xie Weiming, He Qing, Zhang Dai, Zhu Lei, Guo Leicheng, Wang Xianye. The response of morphplogy and sediment characteristics to human modification in an estuarine tidal flat[J]. Haiyang Xuebao, 2019, 41(5): 118-127. doi: 10.3969/j.issn.0253-4193.2019.05.011

Citation:

Xie Weiming, He Qing, Zhang Dai, Zhu Lei, Guo Leicheng, Wang Xianye. The response of morphplogy and sediment characteristics to human modification in an estuarine tidal flat[J]. Haiyang Xuebao, 2019, 41(5): 118-127. doi: 10.3969/j.issn.0253-4193.2019.05.011

Citation:

Xie Weiming, He Qing, Zhang Dai, Zhu Lei, Guo Leicheng, Wang Xianye. The response of morphplogy and sediment characteristics to human modification in an estuarine tidal flat[J]. Haiyang Xuebao, 2019, 41(5): 118-127. doi: 10.3969/j.issn.0253-4193.2019.05.011

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The response of morphplogy and sediment characteristics to human modification in an estuarine tidal flat

doi: 10.3969/j.issn.0253-4193.2019.05.011

1.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;Yellow River Institute of Hydraulic Research, Yellow River Consercancy Commission of the Ministry of Water Resources, Zhengzhou 450003, China
2.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received Date: 2018-06-22

Abstract

Abstract

The estuarine tidal flats are always under the influences of both river inputs and tidal currents. The morphological statuses of estuarine tidal flats are always being dynamic due to both human impacts and natural variations. The human modifications particularly show a strong influence on the short-term morphological changes and sediment characteristics in estuarine tidal flats. A huge embankment was construct in the eastern Chongming tidal flats in the Changjiang River Estuary from 2013 to 2014. Based on Terrestrial Laser Scanner system, non-ground points fitering method, sediment samples and laboratory analyses, this study aim to explore the response of morphplogy and sediment characteristics to human modification in an estuarine tidal flat. The results show that:(1) significant erosion occurs in the southern part while even though light deposition appears in the northern part, the entire tidal flat still experiences significant erosion after the completion of the embankment, with a average decrease of 4 cm in elevation; (2) the median particle size of the sediments increases from 29 μm to 38 μm after the construction; (3) after the completion of the embankment, sediment particle size in the southern part and the flat front increases while decreases in the northern part. The results indicate that human modifications would lead to severe erosion and surficial sediment coarsening, but the response of morphological changes and sediment characteristics still varies in different zones of tidal flats. This study also finds that even though it is riverine sediment input that plays a dominantly role in long-term evolution of estuarine tidal flats, human modifications could change short-term tidal flat morphodynamic processes remarkably.
- tidal flat,
- geomorphology,
- sediment,
- human impact,
- Changjiang River Estuary

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References(30)

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