Hydropower; Energy Storage; Slate Mine; Groundwater Impacts
Abstract :
[en] Renewable energy sources have an increasing role to play in the future energy framework but their intermittence cannot afford a stable production according to the demand. Pumped Storage Hydroelectricity (PSH) is an efficient technology to store and release electricity. However, the development of new PSH plants is limited by environmental and topographic constraints. An innovative alternative consists in using old underground mines as lower reservoirs of Underground Pumped Storage Hydroelectricity (UPSH) plants. In this configuration, large amount of water is pumped and injected in underground cavities and these cyclic stresses impact the groundwater system. A hybrid 3D finite element mixing cell method is used to numerically simulate the use of an UPSH facility, in the case of an abandoned slate mine. Different scenarios are computed with varying pumping injection time-sequences. In order to assess the impact on the surrounding groundwater conditions, the resulting head evolution in the cavity and at different distances is analyzed in terms of groundwater oscillation magnitude, drawdown, and seepage into the cavity. Results show clearly the influence of the pumping injection time-sequence (rates, regularity, timing and duration of no-activity periods) on the actual head evolution in the surrounding medium and consequently on the magnitude of interactions with the cavity. For a given hydraulic conductivity of the surrounding medium (i.e. slates in this case study), the main conclusion is that the resulting interaction seepage flows (in and out of the cavity) are highly dependent on the chosen pumping injection sequences. The future impact of UPSH operation must be assessed taking this fact into account.
Research Center/Unit :
Département ArGEnCo
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Bodeux, Sarah ; Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Pujades, Estanislao ; Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Orban, Philippe ; Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Brouyère, Serge ; Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Dassargues, Alain ; Université de Liège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Language :
English
Title :
An old slate mine as lower reservoir for UPSH (Underground Pumping Storage Hydroelectricity)- groundwater interactions and limitations
Publication date :
27 September 2016
Event name :
43rd IAH CONGRESS; Groundwater and society : 60 years of IAH
Event organizer :
International Association of Hydrogeologists (IAH)
Event place :
Montpellier, France
Event date :
25-09-2016 to 29-09-2016
Audience :
International
European Projects :
FP7 - 600405 - BEIPD - Be International Post-Doc - Euregio and Greater Region
Funders :
SPW-SMARTWATER Project - Public Service of Wallonia University of Liège and EU Marie Curie BeIPD-COFUND postdoctoral fellowship programme (2014-2016) Fonds pour la Recherche dans l’Industrie et l’Agriculture, FRS-FNRS, Belgium CE - Commission Européenne [BE]