Discussion on the impact of karst topography to urban development-A case in Guiyang city
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摘要: 以DEM数据资料为基础,采用GIS手段对贵阳地面坡度、破碎程度等地貌要素进行定量分析,并指出贵阳城市形态、用地供给条件、道路系统和绿地系统等布局和建设都受到喀斯特地貌的影响。贵阳山高坡陡,地形破碎、地下喀斯特发育、灾害隐患多,导致城市空间布局分散、城市用地供给量少质差、道路和绿地系统建设难度大;而用地条件差和组团式分散布局特征又使城市化经济成本偏高,这些问题将给贵阳城市的发展建设带来负面影响。为此,在今后的城市建设中,应强化高效集约利用土地资源和选择紧凑型城市结构、公交优先的交通模式等策略,以缓解城市建设用地紧张状况和降低城市化经济成本,此外,还应注意加强城市地貌环境管理,并对城市不同区域进行空间管制,以保证城市与地貌环境协调发展。Abstract: Based on the quantitative analysis of surface slope and topographic relief in Guiyang city through DEM data and GIS method, it is pointed out in the paper that karst landform affects Guiyang city’s urban shape, urban construction land supply, road systems and greenbelt system as well as construction cost. Guiyang city has high mountain with abrupt slope, crushing terrain and developed underground karst as well more potential hazard. All of which have led to scattered space planning of the city, urban land supply shortage and poor in quality, difficulty in road and greenbelt construction. But poor condition of land-use and scattered layout brings high economic costs to urbanization, which brings negative impact on the development and construction of Guiyang city. Therefore, in urban development in the future, we should choose intensive and efficient use of land resources to make compact urban structure and prioritize public transportation to ease the tension of urban construction land use and reduce economic costs in urbanization. Furthermore, it should also pay attention to strengthen landscape management and space control in Guiyang in order to achieve the coordinated development of urban and landscape.
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Key words:
- karst topography /
- urban construction /
- Guiyang
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