Abstract
An intensified hydrologic cycle and a large amount of monitoring flow data in the latter half of the 20th century attracted a lot of research on the continental U.S. hydrologic change. However, most previous studies are based on HCDN (Hydro-Climate Data Network) dataset with a period of ~1950s −1988. This study analyzed hydrologic change in continental U.S. based on MOPEX (international Model Parameter Estimation Experiment) hydrology dataset with a period of ~1950s −2000 for 302 watersheds (gages) across diverse climate, vegetation and soil conditions. This dataset is more representative of the latter half of the 20th century than HCDN. In contrast with previous studies, this study shows that only 20–30 % of watersheds present increasing trends in flow (streamflow, Q; baseflow, Qbf; baseflow index, BFI), and most (> 65 %) watersheds presents non-significant trends. Similar to previous studies, the watersheds with increasing trends in Q and Qbf are concentrated in Midwest and high plain (North-Central area) of USA. Climate contributes more to Q change (61 ± 25 % vs. 39 ± 25 %) but slightly less to Qbf change than human activity (49 ± 26 % vs. 51 ± 26 %) and much less to BFI change than human activity (−5 ± 61 % vs. 105 ± 61 %). A step change at ~1971 in Q and Qbf was found for 35–45 % but not for a large proportion of watersheds (50 % or more was reported by previous studies). This study provides new insights on the latter half of the 20th century’s hydrologic cycle for the continental U.S. with a more representative dataset of this period.
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Acknowledgments
Xianli Xu is supported by “100 talents program” of Chinese Academy of Sciences (Y323025111, Y251101111). Kelin Wang acknowledges Key Project of the National Twelfth-Five Year Research Program of China (2010BAE00739), and Western Development Project of Chinese Academy of Sciences (KZCX2-XB3-10). We are grateful to the two anonymous reviewers for their helpful comments.
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Xu, X., Liu, W., Rafique, R. et al. Revisiting Continental U.S. Hydrologic Change in the Latter Half of the 20th Century. Water Resour Manage 27, 4337–4348 (2013). https://doi.org/10.1007/s11269-013-0411-3
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DOI: https://doi.org/10.1007/s11269-013-0411-3