期刊
WATER RESOURCES RESEARCH
卷 52, 期 8, 页码 6335-6347出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016WR018617
关键词
base flow recession; watershed Storage; GRACE
资金
- National Aeronautics and Space Administration
- NASA MEaSUREs Program
- NASA GRACE Science Team
Basin-scale groundwater storage trends calculated from long-term streamflow records provide insight into the evolution of watershed behaviors. Our study presents the first spatially relevant validation of recession-based trend approaches by comparing three independent storage trend estimates using GRACE-derived groundwater storage, in situ groundwater elevation observations, and recession-based approaches for the time period of 2003-2015. Results documented consistent agreement between spatially interpolated groundwater observation trends and recession-based storage trends, while GRACE-derived groundwater trends were found to exhibit variable, poor comparisons. A decreasing trend in watershed storage was identified in the southeastern U.S. while increasing trends were identified in the northeast and upper Midwest estimated from recession-based approaches. Our recession-based approach conducted using nested watershed streamflow records identified variable watershed storage trends at scales directly applicable for comparative hydrology studies and for assisting in watershed-based water resources management decisions.
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