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The power of runoff
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering. (Division of River Engineering)ORCID iD: 0000-0003-2726-6821
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering. (Division of River Engineering)ORCID iD: 0000-0003-2716-4446
2017 (English)In: Journal of Hydrology, ISSN 0022-1694, E-ISSN 1879-2707, Vol. 548, 784-793 p.Article in journal (Refereed) Published
Abstract [en]

Although the potential energy of surface water is a small part of Earth's energy budget, this highly variable physical property is a key component in the terrestrial hydrologic cycle empowering geomorphological and hydrological processes throughout the hydrosphere. By downscaling of the daily hydrometeorological data acquired in Sweden over the last half-century this study quantifies the spatial and temporal distribution of the dominating energy components in terrestrial hydrology, including the frictional resistance in surface water and groundwater as well as hydropower. The energy consumed in groundwater circulation was found to be 34.6 TWh/fy or a heat production of approximately 13% of the geothermal heat flux. Significant climate driven, periodic fluctuations in the power of runoff, stream flows and groundwater circulation were revealed that have not previously been documented. We found that the runoff power ranged from 173 to 260 TWh/y even when averaged over the entire surface of Sweden in a five-year moving window. We separated short-term fluctuations in runoff due to precipitation filtered through the watershed from longer-term seasonal and climate driven modes. Strong climate driven correlations between the power of runoff and climate indices, wind and solar intensity were found over periods of 3.6 and 8 years. The high covariance that we found between the potential energy of surface water and wind energy implies significant challenges for the combination of these renewable energy sources.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 548, 784-793 p.
Keyword [en]
Energy components of terrestrial hydrology, Climate driven fluctuations in the power of runoff, Groundwater energy, Surface water energy, Hydropower
National Category
Ocean and River Engineering
Identifiers
URN: urn:nbn:se:kth:diva-210938DOI: 10.1016/j.jhydrol.2017.03.041ISI: 000403739000059Scopus ID: 2-s2.0-85018523561OAI: oai:DiVA.org:kth-210938DiVA: diva2:1127415
Note

QC 20170714

Available from: 2017-07-14 Created: 2017-07-14 Last updated: 2017-07-14Bibliographically approved

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Wörman, AndersRiml, Joakim

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