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Reconstruction of Erosion-Deposition in Yangtze River Estuary South Branch and Related Problem Study,1861-1953

Pan Wei(Center for Historical Geographical Studies of Fudan University,Shanghai,200433)  
Depth datum of 1861,1912,1953 charts are relocated on 2004_ETM image,then creating "Grid system" based on GIS-software Mapinfo.The erosion and deposition intensity of Yangtze Estuary south branch(Xuliujing River estuary-Wusongjiang River estuary) are reconstructed before modern observation system.There was an intense erosion during 1800's metaphase to 1900's initial stage,and a balance with weak deposition during 1900's initial stage to metaphase.The changing level of ≤3m and ≥10m part are the most intense.The routes here today formed by false construction based-on erosion level changing during 1800's metaphase to 1900's metaphase.And rebuild the variance process of Biandan Sand-Nanfeng Sand south in Chongming county seat.This case is a response of a typical channel section to hydraulic engineering.
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