海绵城市建设的地质影响及适宜性研究——以常州市为例

Study on Geological Impact and Suitability in Sponge City Construction—A Case Study of Changzhou City

海绵城市建设以低影响开发为核心,其核心技术措施中的“渗、蓄、滞、净、用、排”与地质环境密切相关。从地质环境适宜性的角度出发,以常州城市规划区为对象,基于GIS类软件,使用层次分析法、综合评分法等方法,综合考虑研究区的地形地貌、包气带特征、浅层含水层特征及地质灾害情况,构建了常州城市规划区海绵城市建设地质环境评价模型,分析了影响海绵城市建设的主要地质因素,并评价了该区地质环境适宜性。主要结论有:浅层含水层岩性与厚度、包气带岩性及地质灾害易发性是影响常州市海绵城市建设最主要的地质因素;研究区海绵城市地质环境整体较好,适宜性在中等及以上地区分布面积占总面积的89.69%。构建的地质环境评价模型可为同类型海绵城市地质环境评价与城市建设提供技术支撑。

The kernel of sponge city construction is low impact development(LID).The core technical measures of influent seepage,impounding,retaining,purifying,utilization and drainage have all closely related to the geological environment.From geological environmental suitability perspective,taking the Changzhou city planning area as the subject,based on the GIS kind of softwares,through AHP,comprehensive scoring etc methods,synthetically think over topographic,vadose zone and shallow aquifer features,as well as geological hazard situation have established Changzhou city planning area sponge city construction geological environment assessment model;analyzed main geological factors impacting sponge city construction,and assessed geological environment suitability in the area.Main conclusions have:lithology and thickness of shallow aquifer,lithology of vadose zone and geological hazard vulnerability are most important geological factors to impact Changzhou City sponge city construction.Sponge city geological environment in study area is better as a whole;percentage of suitability medium to above area is 89.69%in total.Established geological environment assessment model can provide technical support for same typed sponge city geological environment assessment and city construction.