In The 1920s, The Jianghan Plain And The River Network Reconstruction And Related Issues

This topic mainly selects the maps belonging to the Jianghan Plain by screening the 1:50,000 maps of Hubei Province in the 1920s,and georeferences and spatially corrects them in ArcGIS software.Digitally extracting the river surface elements such as rivers,lakes and polders on the map,reconstructing the data of the Polder and the river network in the Jianghan Plain during this period.Based on this,combined with the literature,tried to discuss related issues.And research,got the following understanding and conclusion:First,with the continuous expansion and development of Polder's scale,its shape is not only a random circle structure surrounded by dikes in the literature,but there are many or no partial dikes.Polder,preliminary analysis believes that it is closely related to the type of land use and its geographical location.Second,Polder is divided into three by the Han River and the Yangtze River.The two rivers are the heartland of the Jianghan Plain.The distribution of the fields is the most dense,and the area varies.The area north of the Han River and the south of the Yangtze River is less distributed.Generally speaking,the public security area has adopted a policy of "southering to save the north" for the Jingjiang flood since the Ming and Qing Dynasties.In order to prevent the damage caused by floods,the area of Polder is generally larger.Third,through in-depth investigation of the evolution of the pattern of the fields in Tianmen,Hanchuan and Xiaogan areas in the north of the Han River,it is believed that the construction and development of Polder and the natural factors such as topography,river and lake environment,and the construction and drainage policies of water conservancy projects Social factors such as development and development are closely related,and the dominant factors vary from region to region.Fourth,after continuous development since the Ming and Qing Dynasties,the surface water system of the Jianghan Plain was obviously affected by human factors,showing the complex structure of the river network,the short tributaries and the serious fragmentation of the lake.This phenomenon led to the internal flood control of the Jianghan Plain.The ability is severely weakened.Fifthly,through the quantitative analysis of the density of the river network,it is found that there are obvious high-value areas,and it is considered that the degree of density of the distribution of the field and the degree of fragmentation within the unit area are in good agreement with the density of the river network.The development of Polder is closely related to the change of the river network.Sixth,based on the record of water disputes in the newspapers of the Republic of China,we have a deep understanding of the ongoing process of fighting in the Lulin Lake area.We believe that the main reason for this situation is that the upper and lower public are taking contradictions.Through the violent confrontation to protect their own interests,during the government's efforts and attempts to resolve disputes,but they have been unable to balance the interests of the two people,and finally fell into a vicious circle of constant fighting.