Spatiotemporal patterns and driving factors of urban-rural water use from the production and domestic perspectives: A case study of Beijing-Tianjin-Hebei urban agglomeration, China

Water scarcity is becoming serious with economic growth, causing water competition across various sectors. Previous studies have mostly explored water use in specific sectors, yet little is known about the water reallocation between urban and rural areas. Here, we investigate urban-rural water use from the production (agriculture and industry) and domestic (urban and rural household) perspectives during 2000-2022 in the Beijing-Tianjin-Hebei urban agglomeration, and identify their potential drivers. We find that urban water use changes little due to the offset of industrial and urban domestic use, while rural water use decreases significantly with the trend of 0.387 +/- 0.026 billion m(3)/yr. Water use changes derive from the joint effects of accelerated human activities and decelerated water use intensity. Urbanization explains more variability in water use changes than water resource endowment. Population urbanization, accompanied with rural-to-urban water reallocation, is a primary cause for enlarged urban-rural gap in water use. Urban-rural gap in water use intensity is narrowing, mainly due to the greater decline in agriculture. This study concludes that urban system often withdraws the neighbor agricultural water when the local water availability cannot meet its growing demand, and our findings offer references for regional water resource management and urban-rural environmental justice.