Erosional topography of the tidal limit in the Yangtze River in flood seasons after the river closure at Three Gorges

Shi Shengyu; Cheng Heqin; Zheng Shuwei; Xu Wenxiao; Lu Xuejun; Jiang Yuehua; Zhou Quanping

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Article Navigation > Haiyang Xuebao > 2017 > 39(3): 85-95

Shi Shengyu, Cheng Heqin, Zheng Shuwei, Xu Wenxiao, Lu Xuejun, Jiang Yuehua, Zhou Quanping. Erosional topography of the tidal limit in the Yangtze River in flood seasons after the river closure at Three Gorges[J]. Haiyang Xuebao, 2017, 39(3): 85-95.

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Erosional topography of the tidal limit in the Yangtze River in flood seasons after the river closure at Three Gorges

1.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
2.
Nanjing Center, China Geological Survey, Nanjing 210016, China

Received Date: 2016-06-24

Abstract

Abstract

The evolution of tidal limit and its river regime in response to the Three Gorges Project (TGP) is an important issue in the construction of the Yangtze River Economic Belt. However, due to the limitation of the observation method, there has been no report about the comprehensive study on the change of position of the tidal limit and the geomorphic evolution in this area since TGP river closure. In this study, the average location of tidal limit in recent flood season was identified through spectral analysis of water level in Datong station, the evolution characteristics of landform were analyzed by comparison of bathymetric data in 1998 and 2013 and the high resolution micro-geomorphology in typical erosional areas was carried out by the multibeam echo sounding data. The research shows that: (1) From 1998 to 2013, the overall channel erosion in tidal limit reaches was 5 649.7×10⁴m³. The upper segment was all-round eroded with the erosion depth in the main channel up to 5.6 m. Taibaizhou and Taiyangzhou merged into bank and Tonglingsha was scoured aside. The middle segment was deposited with small amplitudes and the main stream line swung. The north side of Tianranzhou, Heishazhou Middle Waterway was silted up while south side eroded up to 8.9 m. The lower segment was generally eroded with strong erosion near the northern shoreline where the max depth was 15.4 m. (2) The grain size of surface sediment was apparently coarsened, which indicates that the river channels are under severe erosional environment in the near future. (3) The erosional channels were mainly distributed in straight reaches, and the depth was 5.4-12.6 m. The scour pits were distributed in braided reaches where the planform suddenly changed, and the max erosion depth was 28.1-30.5 m. The erosional subaqueous bank slope mostly appeared in straight reaches with serious nearshore erosion, and its slope was 0.59-0.62.
- multi-beam bathymatry,
- erosion,
- micro-geomorphology,
- tidal limit,
- lower Yangtze River

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