Annual runoff coefficient variation in a changing environment: a global perspective

نویسندگان

چکیده

Abstract Assessing variations in the annual runoff coefficient (RC) on a basin scale is crucial for understanding hydrological cycle under natural and anthropogenic changes, yet systematic global assessment remains unexamined from water-balance perspective. Here, we combine observation-based precipitation datasets to quantify basin-averaged RC changes 433 major river basins during period 1985–2014. Thereafter, ratios of terrestrial water storage evaporation (SC EC, respectively) are obtained evaluate factors driving changes. The results show that 12.93% experience significant decreasing trends RC, with slopes ranging −0.55 ± 0.17% yr −1 −0.05 0.02% , while 6.47% increasing RCs 0.09 0.04% 0.56 . A higher percentage (62.95%) reveal regions considerable human intervention compared those (58.24%) dominant variability. Changes EC dominate over 79.68% both trends, maximum contribution (53.65%) transpiration, among other partitioned components. Corroborated inferences explicit investigation Yangtze River highlight robustness our managers policymakers.

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ژورنال

عنوان ژورنال: Environmental Research Letters

سال: 2022

ISSN: ['1748-9326']

DOI: https://doi.org/10.1088/1748-9326/ac62ad