| As the most important material circulation in the natural geographical environment,water circulation plays an important role in indicating natural conditions such as topography,water system,precipitation and social and economic conditions.In recent years,due to the rapid economic development and population growth in Beijing,Tianjin and Hebei,the water resources provided by natural water cycle to cities are far from enough.In this context,how to quantitatively express the Beijing-Tianjin-Hebei water circulation model is particularly important for achieving inter-regional coordinated development and solving water shortages.Considering that the predecessors rarely have a comprehensive and in-depth analysis of the Beijing-Tianjin-Hebei natural-society dual water circulation model.Based on the data of Water Resources Bulletin and China Statistical Yearbook,this paper deeply discusses the binary water circulation model in the study area based on the combination of statistical analysis,Gamma function,JAVA language and GIS technology.The balance between supply and demand of water resources,demand gap,water use efficiency,urban"water charge"and water field intensity are selected as the main contents of identifying the natural-social dual water cycle model.Research on the centralized direction of water resources circulation flow is also carried out.It can provide scientific basis for the social water use and the ecological environment system water use in this area,and provide theoretical support for the rational development and utilization of water resources.The main findings obtained are as follows:(1)In terms of water demand and water shortage,the real part of the ecological water demand of Beijing,Tianjin and Hebei has been increasing year by year in recent 10 years.The real part of annual water demand in Beijing,Tianjin and Hebei Province is 2.195 billion m~3,674 million and 2.97 billion m~3 respectively.Among the imaginary part of water demand,Hebei Province is the highest,Tianjin the second and Beijing the least.In terms of water supply,the blue water supply is the most in Hebei Province,with an average annual water supply of 193 billion m~3,followed by Beijing and Tianjin,which are 3.63 billion m~3 and 2.39billion m~3,respectively.The average annual supply of green water in Hebei Province was26.79 billion m~3,followed by Tianjin and Beijing,which were 2.03 billion m~3 and 1.49 billion m~3,respectively.(2)From the perspective of water use efficiency,the overall water use efficiency of Beijing-Tianjin-Hebei has become more efficient over time.Beijing’s Ten thousand yuan of GDP water consumptionis the lowest in the three regions,followed by Tianjin and Hebei.Change trendof Ten thousand yuanof GDP water consumptionis in Beijing-Tianjin-Hebei region slowed down after 2009.The overall industrial water use efficiency of Beijing,Tianjin and Hebei increases with time.Among them,the average annual Ten thousand yuan of industrial added value water consumption in Hebei Province is the highest in the three regions,followed by Beijing and Tianjin.In the Beijing-Tianjin-Hebei region during the period of 2007-2011,the trend of industrial added value has been moderated.After 2011,with the rapid development of the economy,it will gradually become stable in2015-2016.(3)From the perspective of view of Beijing-Tianjin-Hebei Water Demand Station,the city of Beijing has the largest water charge,which is 2.195 billion m~3,while Tianjin’s water charge is 674 million m3.Among Hebei Province,Tangshan City has the largest"water charge"of 926 million m~3,while Cangzhou City has the smallest"water charge"of 0.79billion m~3 in the whole research area.In the intensity contour map of the Beijing-Tianjin-Hebei water field,the high-intensity water-field area is concentrated in the areas centered on Beijing,Langfang,Tianjin and Baoding.The total“water-charge”in the area accounts for 41.97%of the province.In the direction of field strength,the direction of field strength in Zhangjiakou,Chengde and the vicinity of Tangshan points to urban agglomerations dominated by Beijing,Tianjin and Langfang.The electric field near the city centres of Beijing,Tianjin and Langfang points to the city centre.The water charge around the city centre is very attractive,and the flow direction of water resources is concentrated to the city. |
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