Studyon The Changes Of The Middle And Lower Reaches Of Fuhe River During The Historital Period

This article has collected and organizing the literature about Fuhe river channels in the middle and lower reaches in the history.In addition to the reference of ancient geography book,the article also made reference to the existing copies in Ming Dynasty,such as Wanli Nanchang House recordsand and Zhengde Jianchang House records.And a lot of access to Nanchang and Linchuan regions such as the edition of editing data.In the research,I made to twice field works,confirmed that the river terrace development and the connection between the river swing.This article use more natural geography theory and results in the river's changing law,the changing scope and the reason analysis.Ancient maps and satellite photos have also been used in this article,such as the changes of distributary and main stream occurred in Shimen Township reach,Jinxi Country.It also used ancient maps to change dike-break route and restore some part of reaches in Nanchang since the Tang Dynasty.On the basis of Fuhe river change characteristics of historical period caresses river middle and lower reaches of the river,and the records of combined historical documents.I think Fuhe river's changes of middle and lower reaches in the history could be divided into two sections through Nancheng-Linchuan and Linchuan-Nanchang.1.Nancheng-Linchuan:The channel mainly across pluvial valley plains,the river coast are divided into three catsteps,and the erode and swinging of the range is control by the terrace?and?.The river is stable in the historical period,consistent with the flow of the river today.2.Linchuan-Nanchang:This channel mainly across low alluvial plain.As the Jiangxi province's largest alluvial plain of Gan-Fu.And the estuarine area is located in the northern of Gan-Fu alluvial plain,and it is poyang lake basin.Since the tertiary,Poyang lake basin,has to neotectonic movement in the influence of different amounts lifting movement,the west uplift terrain,and the eastern settlement.It was caused the terrace of ? and ? distribution imbalance in Nanchang area,and the Triple terrace not development.Master or many tributary river coast missing the second terrace of river valley flood land development more,lack the bondage of terrace and the geological structure and landscape environment determines the segment river levee breaches diverted or form(branch)flow channel.From the point of historical period,The Fuhe river lower of Nanchang mainly stream change frequently,the swing of river flows into Ganjiang river and Poyang lake.Since the Ming and Qing Dynasty,Nanchang region has many multiple distributary channels,the water complex,and the flow disorders.From the perspective of the influence of channel change,the Tang Dynasty to the Qing Dynasty on the river,there has been serious lateral erosion in Linchuan city on the river east.So since the Tang Dynasty to Qing Dynasty always have lots of levees along the river,and the others nearly one thousand years continuously renovate Qianjin vicious,this can be proved by all previous dynasties literature.Lateral erosion was strengthened during the Ming and Qing Dynasties,such as the Nancheng Fuhe river west bank often to repaired levees of the Ming and Qing Dynasties.And Nanchnag city has to builted lots of levees during the period of the republic of China.Investigate the reason,with the factors such as the rapid population growth,destruction of the ecological environment,the weather turns cold and so on,during the Ming and Qing Dynasties.In addition,the channel change impact on Marine traffic is also nots allow to ignore.In the history,the rise and fall of Fuzhou Kongjia crossing,and Nanchnag Wuyang crossing on the Fuhe river,is closely related to the changes and swings of Fuhe river.