Research On Contextual Unit And Configuration Mode Of Xi'an Historical And Cultural City

Urban context records the context of urban spatial development,reflects changes in many factors such as urban functions,culture,politics,and economy.And It is an important method to study the development,characteristics and value connotation of urban historical construction.By analyzing the urban context,giving the meaning of "synchronicity" and "diachrony" to the urban heritage,and combing the "position" relationship between the urban heritage.it is an important way to comprehensively understand the historical information of the city and grasp the urban development context.There are many historical heritages in the famous historical and cultural cities,which can reflect the specific features and have unique urban characteristics.As a typical representative of urban construction in history,it is highly condensed in the space of natural ecology,political military,economic culture and other elements,recording the turning point of development of a region or even a country or reflecting the whole development process of the region or even the country,and is an important material carrier for tracing back history and inheriting culture.As the protection of state-list famous historical and culture cities,it has entered the institutionalized construction stage,in the course of nearly 40 years of development,a comprehensive protection system has been formed in which the competent units have been gradually upgraded from the state to local governments;from legal norms to theoretical studies to planning practices system.However,in today's complete protection system,the historical and cultural cities still appear in the process of urban construction,such as the blur of urban historical memory and the digestion of characteristics,the constant erosion of urban historical space,and the alienation ofurban cultural heritage;the urban heritage in the famous cities is facing the crisis of fragmentation,isolation,and even destruction.However,in the process of historical and cultural city protection,this paper summarizes the lack of recognition of urban heritage and its connotation value.The specific performance is as follows: First,the protection of national and provincial rated heritage ontology and the improvement of its surrounding environment have been protected and coordinated,but the lack of recognition and protection of the Unrated heritage ontology and non heritage ontology with historical information has led to the loss of historical information of historical and cultural cities.Second,although the heritage ontology and its surrounding environment are protected and coordinated,the protection and coordination of the relationship between the heritage ontology and the relationship between the heritage ontology and the overall background of the city are ignored;that is to say,the cognition and protection of the "synchronicity" feature between heritage are relatively vague,resulting in the fragmentation of the information chain between heritage and can not be fully expressed.Third,in the process of protection,the urban heritage is protected in the historical category,rather than the urban heritage and the corresponding specific space-time category;that is,the recognition and protection of the "diachronic" characteristics between the heritage are ignored,and the historical information of the "cause and effect,sequence relationship" between the urban heritage is confused.Based on the connotation characteristics of urban context and the analysis method of urban spatial form,this paper puts forward the concept of context unit,combs the relationship between urban heritage,and constructs the interpretation method of urban context.Taking Xi'an,a famous historical and cultural city in the first batch of list,as an example,this paper uses context space unit to analyze the context of Xi'an City,sort out the relationship between "synchronic" and "diachronic" between urban heritage and background environment,and explore the context,historical characteristics and connotation of urban development.Taking the historical and cultural city of Xi'an in the first batch of published lists as an example,using the context space unit to analyze the context of Xi'an city,sorting out the relationship between "sychronism" and "diachronicity" between urban heritage and background environment Explore the context,historical features and connotation of urban development.On this basis,thepaper puts forward the strategy of historical and cultural heritage,the scheme of urban characteristic protection and the path of historical memory continuation.Through the use of spatial units of urban context,it can provide methodological support for the integration of urban context into the protection of historical and cultural cities,make up for the lack of cognitive path for urban heritage and its connotation in the protection of historical and cultural cities,and avoid the fragmentation and isolation of urban heritage protection and its background connection in the process of protection,as well as the loss,confusion and alienation of urban historical information.There are three innovations in this paper: First,based on the analysis method of urban spatial context and urban spatial form,the paper puts forward the concept,elements and definition method of context spatial unit,which provides methodological support for the analysis of Xi'an urban context.Second,based on the system level division of urban space,on the basis of the investigation and statistics of the elements of Xi'an context space,from the three levels of macro,meso and micro,that is,urban regional context space,urban ontology context space and urban unit context space,sort out the relationship between the elements of context space,so as to fully analyze the urban context of Xi'an and obtain Historical information contained in urban space.Third,based on the results of urban context analysis,this paper puts forward the strategy of context space protection of Xi'an historical and cultural city.