EVALUATION OF COUPLED ACCESSIBILITY OF TWO SOURCES OF SURFACE WATER RESOURCES IN MOUNTAINOUS RURAL AREAS——A CASE STUDY OF QIJIANG DISTRICT,CHONGQING MUNICIPALITY
Surface water is the main water used in mountainous villages of Southwest China and it is the basis and premise to establish a sustainable development framework to find out the spatial pattern of water intake convenience of surface water in mountainous villages.Taking the rural area of Qijiang in Chongqing municipality as an example,this research used the river network,reservoir vector data,DEM,precipitation,land use grid data and storage capacity statistical data,etc.,and adopted the improved CRITIC method and comprehensive overlay accessibility evaluation model to analyze two-source coupling accessibility of surface water resources and its spatial agglomeration characteristics.The results showed that:(1)The average accessibility of the two-source coupling accessibility of 373 sample villages was 0.58(the maximum value was 1),and the accessibility level of 52%of the villages was above 0.58.Among them,there were 140 villages with good accessibility(0.43～0.57,data from the first 47%percentile),and there were 160 villages with poor accessibility(0.59～0.73,data from the last 47%percentile),accounting for 42.89%.(2)The accessibility of river water sources showed a pattern of high in the north and low in the south,and local contiguous areas.The accessibility of water sources of reservoirs presented a pattern of low in the central and south and high in the northwest.(3)The variation range of the accessibility index of river water source and reservoir water source was 0.19～0.88 and 0.15～0.89,and the corresponding variation range of the two-source coupling accessibility index was 0.21～0.86.The proportion of different water intake accessibility areas showed that,the middle area(data at the 45%～55%quantile point)accounted for the largest proportion,with an average of 30%,and the extreme cases(data at the first 40%or the last 40%of the quantile point)accounted for a small proportion,with an average of only 10%.(4)The two-source coupling accessibility index had significant spatial agglomeration characteristics,and the global Moran index was 0.62.The high-value cluster(HH)was concentrated in the northern region,and the low-value cluster(LL)was concentrated in the southern region.In summary,this study reveals the spatial differentiation pattern of surface water resource supply capacity in Qijiang District,and it can provide a basic basis for rural sustainable development and rural revitalization planning.The results of field investigation and expert consultation feedback show that the research are relatively accurate.
surface water resourcesaccessibility evaluationmountainous rural areastwo-source couplingQi-jiang district of Chongqing municipality
NETL
NSTL
万方数据
