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Drought Conditions Enhance Groundwater Table Fluctuations Caused by Hydropower Plant Management

descriptionPublicationkeyboard_double_arrow_right Article 01 Oct 2022 Germany Publisher:American Geophysical Union (AGU)Journal:Water Resources Research, volume 58 (issn: 0043-1397, eissn: 1944-7973,

Authors: Basilio Hazas, M.; Marcolini, G.; Castagna, M.; Galli, M.; Singh, T.; Wohlmuth, B.; Chiogna, G.; +6 Authors

doi: 10.1029/2022wr032712

Drought Conditions Enhance Groundwater Table Fluctuations Caused by Hydropower Plant Management

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Abstract

AbstractManagement of hydropower plants strongly influences streamflow dynamics and hence the interaction between surface water and groundwater. As dam operations cause variations in river stages, these can result in changes in the groundwater level at multiple temporal scales. In this work, we study the case of an Alpine aquifer, where weekly fluctuations are particularly pronounced. We consider an area with four river reaches differently impacted by reservoir operations and investigate the influence of these rivers on the common aquifer. Using continuous wavelet transform and wavelet coherence analysis, we show that weekly fluctuations in the groundwater table are particularly pronounced in dry years, in particular in the winter season, although the area of the aquifer impacted by dam operations remains almost unchanged. We thus observe that in Alpine catchments, surface water‐groundwater interaction is sensitive to the conditions determined by a specific hydrological year. We also investigate the influences of the river‐aquifer water fluxes and show that under dry conditions hydropeaking mainly affects their temporal dynamics. Our observations have significant consequences for predicting nutrient and temperature dynamics/regimes in river‐aquifer systems impacted by hydropower plant management.

Country

Germany

Related Organizations

Technical University of Munich
Germany
University of Technology
Russian Federation

Keywords

groundwater modeling, managed rivers, ddc:551, surface water‐groundwater interaction, GENERAL ; Climate and interannual variability ; Numerical modeling ; Time series experiments ; NATURAL HAZARDS ; Atmospheric ; Geological ; Oceanic ; Physical modeling ; Climate impact ; Risk ; Disaster risk analysis and assessment ; Preparedness and planning ; NONLINEAR GEOPHYSICS ; Probability distributions, heavy and fat-tailed ; Scaling: spatial and temporal ; OCEANOGRAPHY: PHYSICAL ; Air/sea interactions ; Decadal ocean variability ; Ocean influence of Earth rotation ; Sea level: variations and mean ; Surface waves and tides ; Tsunamis and storm surges ; PALEOCEANOGRAPHY ; POLICY SCIENCES ; Benefit-cost analysis ; Regional planning ; RADIO SCIENCE ; Radio oceanography ; SEISMOLOGY ; Earthquake ground motions and engineering seismology ; Volcano seismology ; SPACE PLASMA PHYSICS ; Stochastic phenomena ; VOLCANOLOGY ; Volcano/climate interactions ; Atmospheric effects ; Volcano monitoring ; Effusive volcanism ; Mud volcanism ; Explosive volcanism ; Volcanic hazards and risks ; Research Article ; surface water-groundwater interaction ; hydropower ; managed rivers ; groundwater modeling [ATMOSPHERIC COMPOSITION AND STRUCTURE ; Air/sea constituent fluxes ; Volcanic effects ; BIOGEOSCIENCES ; Climate dynamics ; Modeling ; COMPUTATIONAL GEOPHYSICS ; Numerical solutions ; CRYOSPHERE ; Avalanches ; Mass balance ; GEODESY AND GRAVITY ; Ocean monitoring with geodetic techniques ; Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions ; Global change from geodesy ; GLOBAL CHANGE ; Abrupt/rapid climate change ; Climate variability ; Earth system modeling ; Impacts of global change ; Land/atmosphere interactions ; Oceans ; Regional climate change ; Sea level change ; Solid Earth ; Water cycles ; HYDROLOGY ; Groundwater hydrology ; Groundwater/surface water interaction ; Time series analysis ; Water management ; Climate impacts ; Extreme events ; Hydrological cycles and budgets ; INFORMATICS ; Temporal analysis and representation ; MARINE GEOLOGY AND GEOPHYSICS ; Gravity and isostasy ; MATHEMATICAL GEOPHYSICS ; Persistence, memory, correlations, clustering ; Stochastic processes ; ATMOSPHERIC PROCESSES ; Climate change and variability ; Climatology ; General circulation ; Ocean/atmosphere interactions ; Regional modeling ; Theoretical modeling ; OCEANOGRAPHY], hydropower, ddc: ddc:

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