GIS supporting study on calculation of the amount of siltation and erosion in mouth bars of the Changjiang Estuary

WU Hua-lin; SHEN Huan-ting; HU Hui; ZHANG Li-li; HUANG Qing-hui

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Article Navigation > Haiyang Xuebao > 2002 > 24(2): 84-93

WU Hua-lin, SHEN Huan-ting, HU Hui, ZHANG Li-li, HUANG Qing-hui. GIS supporting study on calculation of the amount of siltation and erosion in mouth bars of the Changjiang Estuary[J]. Haiyang Xuebao, 2002, 24(2): 84-93.

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GIS supporting study on calculation of the amount of siltation and erosion in mouth bars of the Changjiang Estuary

1.
Estuary and Coast Research Center, Ministry of Communications, Shanghai 201201, China;State Key laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
2.
State Key laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received Date: 2000-07-28
Rev Recd Date: 2000-01-25

Abstract

Abstract

Supported by GIS,10 pieces of charts of the Changjiang Estuary from 1842 to 1997 are studied.Digital elevation model of the Changjiang Estuary is established with Kriging gridding method to research evolution of channel,change of coasts,formation and evolution of islands in mouth bar area with different points of view:transverse sections,longitudinal profiles,plane change,etc.Furthermore channel-fill volumes are calculated and calculations of amount of deposition and erosion in different scopes between different years are conducted.The calculated results show that the evolution of mouth bar area of the Changjiang Estuary was complex in near 155 a(1842-1997):deposition has its trend,but the speeds of deposition in different terms are different and erosion occurs place in a few terms which mainly are related to dynamic conditions.About 3.81 Gt of sediment was deposited between 1842 and 1997,with average annual deposition rate of 24.6 Mt which amounts to 5% of sediment form the Changjiang River.Jiuduansha,Hengsha and its east beach,and east beach of Chongming Island are the main positions of siltation and the current North Passage is the main position of erosion.In addition,there is slight erosion in the upper part of the North Channel and part of the South Passage.Together,the area of erosion is limited and it only amounts to 21.496 of total study area.
- Changjiang Estuary,
- mouth bars,
- UlS,
- deposition and erosion of sediment,
- calculation

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References(22)

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