A Study On The Morphology Of Across-river Towns On The Border Of Jiangsu And Anhui

In the middle and lower reaches of the Yangtze River,river crossing towns are very common.This paper takes Dongba,Xiaba and dingbu along Xu River as examples to study the river-across town morphology.It is expected to provide operational guidelines for the construction of the towns along the Xu River and the characteristics of the towns along the river.This paper refers to historical data such as county records from the perspectives of history and reality,and studies the historical process of urban formation and development.From the perspective of reality,the overall shape,urban form skeleton,urban texture,public space and facilities,and buildings From the perspective of analysis,analyze the driving mechanism of urban morphology evolution from multiple dimensions,and summarize the commonness and difference.This article first focuses on the research object.From the research origin and research purpose,the necessity and value of this type of town are described.At the same time,a literature review is carried out to determine the structure and research method of the article.Secondly,in the part of historical evolution research,the collected drawings and written materials are explained.From the perspective of Xu River and the development of towns,the history is sorted out,and it is concluded that Dongba,Xiaba and Dingbu are all synergies of natural evolution Type of town,and summarize the relevant development laws.Then based on the research on the status quo,this article studies from the perspective of overall appearance,urban form skeleton,urban texture,public space and facilities,and buildings.At the level of overall appearance,the analysis is conducted from the perspective of overall form and spatial evolution,and the urban morphology and structure are obtained.The shape of Xiaba and Dingbu spread linearly to agglomerate.The shape of Dongba is a belt extending axially towards the beaded shape.At the level of the urban form skeleton,from the perspective of the street network system and the street analysis,the three town network systems are all combined with the grid.From the nature of use,it is divided into commercial streets,mixed streets,and living streets,and typical streets are selected for analysis to summarize the characteristics of various types of street spaces.At the level of urban texture,first classify the texture by type.Under each type,select the typical texture for analysis,and get the process and reason of the change in texture.At the level of public space and facilities,it is divided into two types: public space and water conservancy facilities.Based on research,public space is divided into two types: living space and sacrificial space.Based on this,typical models are selected for analysis.Living spaces are mostly compound in use.The ancestral hall reflects that the town was built on the basis of blood.Temples are people's spiritual sustenance and related to needs.Water conservancy facilities are relatively special types in river-crossing towns.This article analyzes from three perspectives: bridge,check-gate and water port.Bridge and water port have a positive impact,and check-gate has a negative impact.At the level of individual buildings,typical public buildings and residences are selected for analysis,and the characteristics of buildings in different periods are obtained.The traditional courtyard type is mostly two-entry style,with brick and wood structure,blue brick and small tile,and hard mountain top.The usage pattern changes with living habits.The fourth chapter is the analysis of evolutionary factors.Combining the special form of river-crossing towns,the urban development motivation mechanism is summarized from the perspective of natural factors,economic factors and political factors.Finally,the article summarizes the article from the perspective of the commonness and difference of the towns,and at the same time thinks about the deficiencies of the thesis research.Most of the rivercrossing towns along the Xu River have double-bank layouts and have formed similar cultural and architectural styles.Along the river,a linear space of "river-street-room" is formed and a combshaped road network is formed.The road network near the bridge is twisted to follow the river.The differences in Dongba,Xiaba,and Dingbu have gradually increased due to different constraints,economic foundations,and development strategies.The whole thesis contains about 56 000 words,193 pictures and charts.