The Study On Two Song Huaihe River Region Area City Defense Mechanism And Urban Spatial Form

Huaibei mining area,western connected Jinxiang,Sichuan and Shaanxi,north into Central Plains,south control Suzhou and Hangzhou.It was an important military defense area during the song dynasty.With its special strategic location and superior transportation and rich economy in the song periods,it became the prosperous economic zone and financial source of the northern song dynasty and the first line of defense of the imperial court in the southern song dynasty.From economic towns to military towns,the urban spatial development brought by the transformation of urban function is its special urban structure and morphological characteristics.In this study,the urban defense mechanism and urban spatial morphology of the two huai-huai area were studied,and the area of the two huai-huai area in the song dynasty was the main research area.This paper discusses the regional defense space system,the construction and distribution of fortifications and the spatial forms of towns.First of all,from the important history of the song dynasty,the characteristics and importance of the area in the song dynasty were revealed.Through location analysis,traffic condition analysis,natural geographical conditions and economic conditions,this paper describes the position and strategy of the two huai-huai region on military and national defense in the song dynasty.Based on the study of the defense space system below.Secondly,the relationship between political decision-making and military action in the song dynasty is analyzed from the perspectives of national defense,military system and defense strategy.From the passive defense strategy of the northern song dynasty and the influence of the military system and defense strategy of the southern song dynasty.In the southern song dynasty,it formed a series of defense diplomacy that was not aggressive in negotiations and military operations.Finally,on the basis of the above,based on defense space layout,the defense mechanism of huaibei theater,a defensive strategy,urban space elements and morphological characteristics,analyze defense mechanism and the spatial form of huaibei area towns;The area is the "two horizontal and three longitudinal" defensesystem,which is the core of Shouchun,Luzhou,Chuzhou and Yangzhou,and gives examples to analyze the characteristics of defensive line and urban defense space.There are four defensive tactics,such as sentinel defense,stepper riding,joint defense of multiple arms,and civil defense.The urban form of the water environment of the city;The wall system is divided into square and near square,near circular and irregular shape;City pool structure divided into single city,twin cities and one city three pools;It also studies the analysis and utilization of urban fortification style,defensive space characteristics and town scale.finally analysis urban functional zoning and architectural layout features.Based on the field investigation of the ancient town in the song dynasty,with the ancient books,local Chronicles,literature search and data collection for reference,gradually spread to two song and Huaibei region military towns defense mechanism and the research of space form.