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Water Scarcity Will Constrain the Formation of a World-Class Megalopolis in North China ✉ ✉ Zhuoying Zhang 1,2, Minjun Shi 3 , Kevin Z

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Water Scarcity Will Constrain the Formation of a World-Class Megalopolis in North China ✉ ✉ Zhuoying Zhang 1,2, Minjun Shi 3 , Kevin Z www.nature.com/npjUrbanSustain ARTICLE OPEN Water scarcity will constrain the formation of a world-class megalopolis in North China ✉ ✉ Zhuoying Zhang 1,2, Minjun Shi 3 , Kevin Z. Chen4,5 , Hong Yang6,7 and Shouyang Wang 1 The formation of world-class megalopolises has been a goal of urban development agencies around the world owing to their economic advantages. On their bids of becoming a world-class megalopolis, water availability is a factor that requires consideration. China has set an ambitious goal of developing a world-class megalopolis in the water-scarce Beijing-Tianjin-Hebei (BTH) region. This study investigates the water challenge the BTH region faces and the effects of main water conservation measures in the region towards the goal. An inter-city input–output model was constructed for identifying the water gap in the region and analyzing the effectiveness of main water conservation measures under various scenarios. The results indicate a significant gap between the water required to achieve the goal of becoming a world-class megalopolis and the region’s available water resources. Although proposed water conservation measures of improving water use efficiency and reducing agricultural water use provide a modest improvement, the amount of water required for urban development still exceeds the availability. The study emphasizes the significance of agricultural water use reduction in Hebei through crop system replacement from water-intensive winter wheat to water-saving crops. The study also proposes an alternative option of adjusting the development plan through redefining the boundary of the BTH megalopolis by excluding part of cities in Hebei. The results of this study contribute to a better understanding of the effect of water scarcity on urban development and thus provide references for other water-scarce regions with ambitious 1234567890():,; urban development goals. npj Urban Sustainability (2021) 1:13 ; https://doi.org/10.1038/s42949-020-00012-8 INTRODUCTION There are six internationally acknowledged world-class megalopo- The past decades have witnessed significant urbanization through- lises, including the Atlantic Coast megalopolis, the Japan Pacific out the world. According to a report by United Nations, 55% of the Coast megalopolis, the Great Lakes megalopolis, the Northwestern world’s population lives in urban areas in 2018 and this proportion Europe megalopolis, the Yangtze River Delta megalopolis, and the 12,13 is expected to increase to 68% by 20501. Acceleration of urban British megalopolis . expansion and transformation has boosted the formation of Not surprisingly, the formation of megalopolises has become a megalopolises, which are concentrated urbanized areas with goal of many urban development agencies around the world. A highly developed spatial form of integrated cities2. Extensive challenge is how to ensure a rapid urban expansion sustainably. empirical studies showed the positive productivity gains from the Water is indispensable in almost every production and consump- formation of megalopolises for countries engaging in international tion process. Water scarcity has been challenging sustainable competition and cooperation in an increasingly global economy3–5. urban development globally. In 2019, the United Nations World The formation of megalopolises fortified urban scale economies Water Development Report indicated that the global water use through better access to inter-industry information flows, abun- had been increasing worldwide by ~1% per year since the 1980s, dant, and diversified labor forces, specialized services, as well as driven by a combination of population growth, socio-economic general public infrastructure and facilities. World-class megalopolis development, and changing consumption patterns14. Global represents the highest level of megalopolises. The earliest water demand is expected to increase by 20–30% until 2050, prototypical conception for world-class megalopolis can be traced and much of the growth will be attributed to increase in demand back to the megalopolis of “BosWash corridor” in the northeastern of the industrial and domestic sectors15,16. Megalopolises, where United States, which included the large cities of Boston, New York, agglomerations of population and production activities bring Providence, Hartford, New Haven, Philadelphia, Baltimore, and about the increasing demand for water resources, commonly Washington6. From this study onward, the connotation has been encounter water crisis and this, in turn, restricts their further continuously enriched by subsequent scholars7–11. However, a development17,18. Figure 119 demonstrates a high correlation consensus on a specificdefinition for world-class megalopolis has between the economic growth of the world-class megalopolises yet to be reached. It is generally agreed that the common features and the abundance of water resources, verifying the significance of the world-class megalopolis should include: densely clustered of water resources to megalopolises’ economic development. A cities and non-agricultural population, sufficiently large economic high level of economic growth requires sustained and adequate size, highly developed industries (particularly, tertiary industries), water supply, as water is the principal factor supporting the one or multiple internationally influential core cities and closely development of a region. Given the fact that the six internationally integrated economic connections among cities in the megalopolis. acknowledged world-class megalopolises are not water-scarce 1Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100190, China. 2Key Laboratory of Management, Decision and Information Systems, Chinese Academy of Sciences, Beijing 100190, China. 3School of Public Affairs, Zhejiang University, Hangzhou 310058, China. 4China Academy for Rural Development, Zhejiang University, Hangzhou 310058, China. 5International Food Policy Research Institute. 1201 Eye St. NW, Washington, DC 20005-3915, USA. 6Swiss Federal Institute of Aquatic Science ✉ and Technology, Duebendorf 8600, Switzerland. 7Department of Environmental Sciences, University of Basel, Basel, Switzerland. email: [email protected]; [email protected] Published in partnership with RMIT University Z. Zhang et al. 2 4,200 The Great Lakes The Atlantic Coast The Japan Pacific Coast 3,600 megalopolis megalopolis megalopolis 3,000 2,400 The British megalopolis The Yangtze River Delta megalopolis GDP (billion USD) 1,800 The Northwestern Europe megalopolis 1,200 The BTH region 600 0 0 300 600 900 1,200 1,500 1,800 Water use per capita (m3/cap) Fig. 1 Correlation between economic growth and water use in the BTH region and existing world-class megalopolises (year 2017). A plot of GDP versus annual per capita water use in the BTH region and the six existing world-class megalopolises. It demonstrates a high correlation between the economic growth of the world-class megalopolises and the abundance of water resources. regions, the restrictive effect of water did not capture much economic development and water resources. Beijing is the most 1234567890():,; attention in their development. As ambitious urban development economically developed entity, with the highest GDP per capita, goals are being put forward in a number of water-scarce regions in followed by Tianjin. Hebei is the least developed area among the the world, water availability is a critical factor that requires three. Water conditions are relatively better in the cities in consideration. northern Hebei, with annual per capita water resources averaged The Chinese government is promoting the Beijing-Tianjin-Hebei over 400 m3. The cities in southern Hebei are water scarcest, with (BTH) region to become a world-class megalopolis in China in annual per capita water resources <150 m3 (Fig. 219; Supplemen- addition to the Yangtze River Delta megalopolis20. Much attention tary Table 4). A challenging question is whether water scarcity will has been focused on the BTH region since the implementation of prevent the BTH region from becoming a world-class megalopolis. “The Plan for the Coordinated Development of Beijing, Tianjin, and Given the significant spatial heterogeneity and nonnegligible Hebei” enacted by the Chinese central government in 2015. The economic connections across cities in the BTH region, it is Plan has proposed the long-term goal for the BTH region to necessary to incorporate city-level differences and inter-city become a world-class megalopolis. However, the BTH region is connections in analyses of the region’s water challenge on its severely constrained by water availability, with an annual per ambition to become a world-class megalopolis. capita water resources of <200 m3, approximately one-tenth and In recent years, the intensifying resource and environmental one-fortieth of the national and world averages, respectively21.In pressure has attracted an increasing attention from scholars and addition to water scarcity, three further shortcomings of the BTH policymakers on the sustainable challenges encountered in urban region can be identified compared with the existing world-class development22–25. As one of the most fundamental and megalopolises. Firstly, the economic size of the BTH region in indispensable natural resources, water constraint on urban terms of gross domestic product (GDP) is still small. In 2017, the development has led to concern in public and academic BTH region’s GDP was 1.19 trillion USD (The exchange rate circles26–28. Moreover,
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