The stationarity of hydrological systems is dead in the era of the Anthropocene. Has our hydrological or water resources knowledge been well transformed to address this change? By using publications indexed in the Web of Science database since 1900, we aim to investigate the global development of water resources knowledge at the river basin scale with a systems approach, of which water resources knowledge development in a river basin is defined as a complex system involving the co-evolutionary dynamics of scientific disciplines and management issues. It is found that (1) legacy-driven water resources knowledge structures have consistently dominated most of the highly researched river basins in the world, while innovation-driven structures are identified in the river basins receiving increasing research publications in the recent period; (2) the management issues addressed by legacy-driven river basin studies are increasingly homogenized, while a wider range of emerging issues are considered by innovation-driven river basin studies; and (3) cross-disciplinary collaborations have remained largely unchanged and collaborations with social sciences have been very limited. It is concluded that the stationarity of water resources knowledge structure persists. A structural shift of water resources knowledge development is urgently needed to cope with the rapidly changing hydrological systems and associated management issues, and opportunities for such a shift exist in those less researched but globally distributed innovation-driven river basins.
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