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| Titel |
GRACE storage-runoff hystereses reveal the dynamics of regional watersheds |
| VerfasserIn |
E. A. Sproles, S. G. Leibowitz, J. T. Reager, P. J. Wigington, J. S. Famiglietti, S. D. Patil |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 7 ; Nr. 19, no. 7 (2015-07-28), S.3253-3272 |
| Datensatznummer |
250120770
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| Publikation (Nr.) |
 copernicus.org/hess-19-3253-2015.pdf |
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| Zusammenfassung |
| We characterize how regional watersheds function as simple, dynamic systems
through a series of hysteresis loops using measurements from NASA's Gravity
Recovery and Climate Experiment (GRACE) satellites. These loops illustrate
the temporal relationship between runoff and terrestrial water storage in
three regional-scale watersheds (> 150 000 km2) of the
Columbia River Basin, USA and Canada. The shape and size of the hysteresis
loops are controlled by the climate, topography, and geology of the
watershed. The direction of the hystereses for the GRACE signals moves in
opposite directions from the isolated groundwater hystereses. The subsurface
water (soil moisture and groundwater) hystereses more closely resemble the
storage-runoff relationship of a soil matrix. While the physical processes
underlying these hystereses are inherently complex, the vertical integration
of terrestrial water in the GRACE signal encapsulates the processes that
govern the non-linear function of regional-scale watersheds. We use
this process-based understanding to test how GRACE data can be applied
prognostically to predict seasonal runoff (mean Nash-Sutcliffe Efficiency of
0.91) and monthly runoff during the low flow/high demand month of August
(mean Nash-Sutcliffe Efficiency of 0.77) in all three watersheds. The global
nature of GRACE data allows this same methodology to be applied in other
regional-scale studies, and could be particularly useful in regions with
minimal data and in trans-boundary watersheds. |
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