“城市双修”导向下的景德镇历史水系恢复方式探讨

Discussion on Restoration of Historical Water System Based on “Urban Double Restoration”of Jingdezhen City Guidance

随着城市建设的不断推进,城市历史水系的消亡已成为众多城市的通病,在丘陵城市地区更为突出,而该现象与当前城市存在的内涝频发、水体黑臭等"城市病"有着不可分割的联系。以景德镇实际问题为基础,结合"城市双修"工作,因地制宜地提出了历史水系恢复策略。利用GIS对城市地形深度分析自然汇水线,并在此基础上与历史水系、现状开放空间、洪涝淹没区进行空间叠加对比分析以确定重点修复区域;同时,借鉴国内外相关研究对水系的概念进行了拓展,将城市水系分为"常态"与"非常态"水系,并根据重点修复区的实际恢复条件,重点选择3条常态水系进行空间恢复并实现水系脉络连通;结合海绵城市建设利用区内城市开放空间,布置三个层级的雨水调蓄设施系统组成"非常态"雨洪调蓄网络用以存蓄雨水资源,补充常态水域网的生态基本用水量,实现既能节约城市水系恢复建设成本又能有效解决城市水系旱季缺水问题的规划目标,同时也为丘陵城市地区关于历史水系恢复、水系建设与管理等方面提供了较为新颖、有效的实施经验。

With the continuous progress of urban construction,the extinction of the city ’s historical water system has become a common disease in many cities,especially in the hilly urban areas,and this phenomenon has an inseparable connection with the frequent occurrence of urban waterlogging,water body blackness and other "urban diseases". Based on the actual problems of Jingdezhen City,this paper combined the work of "urban double restoration"and proposed a historical water system recovery strategy according to local conditions. GIS was used to deeply analyze the natural waterline of urban terrain depth. And based on this,it was spatially superimposed and analyzed with historical water system,open space and flooded inundation area to determine the key restoration area. At the same time,the concept of water system was expanded with reference to domestic and foreign related researches. The urban water system was divided into "normal"and "extraordinary "water systems. According to the actual recovery conditions of the key restoration areas,three normal water systems had been selected for spatial restoration and water system connectivity. Combined with the urban open space in the sponge city construction district,three levels of rainwater storage facilities were arranged to form an "extraordinary"rainwater storage network for storing rainwater resources, supplementing the ecological basic water consumption of the normal water network. It could not only save the cost of urban water system restoration and construction,but also effectively solve the problem of water shortage in dry season of urban water system. At the same time,it also provided a relatively novel method and effective implementation experience for the restoration of historical water system,the construction and management of water system in hilly urban areas.