RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (04): 560-566.doi: 10.11870/cjlyzyyhj201604004

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VARIATIONS AND CAUSES OF SEDIMENTATION CHARACTERISTIC IN SOUTH CHANNEL OF YANGTZE ESTUARY

ZHU Qiang1, YANG Shi-lun1, MENG Yi1, YANG Hai-fei1, WU Chuang-shou2, SHI Ben-wei3   

  1. 1. State Key Lab of Estuarine & Coastal Research, East China Normal University, Shanghai 200062, China;
    2. Zhejiang Institute of Hydraulics & Estuary, Hangzhou 310020, China;
    3. Key of Laboratory for Coast and Island Development, Ministry of Education, Nanjing University, Nanjing 210093, China
  • Received:2015-07-19 Revised:2015-09-22 Online:2016-04-20
  • Supported by:
    Science and Technology Commission of Shanghai Municipality (10dz210505); the State Key Program of National Natural Science Foundation of China (41130856)

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Abstract: The South channel is one of the two major entrances of Yangtze River into the sea, and the necessary passage of the North deep-water navigation channel. In this paper, we collected the topographic maps and 12 sediment samples from 1984 and 2012, and compared the grain size of riverbed surficial sediment using the same method (sieve and pipette analysis) of the two years. The erosion and/or deposition of the two year was analyzed by using the ArcGIS software. The results showed that there was a major geomophological change in the South Channel during the past 28 years. Sand ridges in compound channels were dying out due to sediment erosion, whereas the main channel tended to be shallow to several meters due to siltation at the same time. Moreover, the median grain size of surficial sediment decreased from 81 μm to 24 μm, especially the sediment type on the original ridge changed from sand to sandy silt, even clayey silt. We determined that sand extraction mainly caused these changes in South channel because this activity led to the extinction of mid-ridges in the compound channels, weakened hydrodynamic environment, and amplified the area of the crossing-section. Siltation on both sides of the channel arose due to lessening in flow velocity. The sediment size became finer depending on combination of coarse sediment dredging, weakening current and slitting in the channel.

Key words: the South Channel, topographic maps, sieve and pipette analysis, surficial sediment, sand extraction, sediment fining

CLC Number: 

  • TV882.2
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