Urban construction suitability evaluation based on Analytic Hierarchy Process:a case study of Beijing-Tianjin-Hebei region
This paper is the result of urban construction suitability evaluation.[Objective]Beijing-Tianjin-Hebei is a world-class urban agglomeration with a high concentration of industrialization and urbanization.For a long time,the contradiction between people and land in the Beijing-Tianjin-Hebei region has been prominent,and the matching degree between the pattern of territorial space development and the spatial layout of resources and environment is relatively low.Therefore,it is necessary to scientifically and comprehensively evaluate the suitability of urban construction and identify the potential space suitable for urban construction in the future,so as to provide a scientific basis and decision-making support for the delineation of urban development boundaries and the intensive,economical and efficient use of urban land.[Methods]Based on the guidance of"double evaluation",this paper establishes the evaluation index system of urban construction suitability in the Beijing-Tianjin-Hebei region and evaluates the urban construction suitability in this region by AHP and weighted average composite index method.On this basis,combined with the"three adjustments"data of land,in accordance with the principle of giving priority to ecological protection and stabilizing the amount of cultivated land,the extremely important ecological protection area,nature protection area,current wetland,urban and infrastructure construction land,special land,etc.are deducted from the suitable urban construction areas in order to identify the potential space suitable for urban construction in the future.[Results]The urban construction suitable area covers 123 027.2 km2,accounting for 56.98％of the total land area of the Beijing-Tianjin-Hebei region;the general suitable area covers 45 773.43 km2,accounting for 21.20％;the unsuitable area covers 4850.16 km2,accounting for 2.25％;the potential scale of the urban construction suitable area is 4 676.30 km2.Hebei Zhangjiakou City and Chengde City have great potential for urban construction land construction,followed by Baoding City,Tangshan City,and Qinhuangdao City.[Conclusions]In the eastern part of Beijing,the western part of Tianjin,the southeastern part of Baoding,the southern part of Cangzhou-the eastern part of Hengshui and the eastern part of Handan,groundwater is seriously overdrawn and there are problems of ground subsidence.It is suggested to combine the prohibition(limit)of groundwater extraction and appropriately optimize and adjust the land use mode when conditions allow.The location of an active fault zone may directly affect the planning,construction,and operation safety of major projects such as cities and transportation,so it is suggested to strengthen the investigation and evaluation of active fault zones and take measures to avoid the active fault or improve the corresponding seismic fortification level.
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