Skip to main content
main-content

Tipp

Weitere Artikel dieser Ausgabe durch Wischen aufrufen

01.03.2015 | Thematic Issue | Ausgabe 6/2015

Environmental Earth Sciences 6/2015

Groundwater monitoring impacts of deep excavations: hydrogeology in the Venda Nova repowering schemes (NW Portugal)

Zeitschrift:
Environmental Earth Sciences > Ausgabe 6/2015
Autoren:
N. Plasencia, J. M. Carvalho, T. Cavaco
Wichtige Hinweise
This article is an updated and deepened revision of the paper “Groundwater impacts of deep excavations; The Venda Nova repowerings case” presented on the 12th International Conference “Underground Construction Prague 2013”, from the same authors.

Abstract

The Venda Nova hydroelectric repowering schemes consist of two fully underground hydraulic circuits, more than 4 km long, situated on the left bank of the Rabagão River (NW Portugal). The first one, Venda Nova II (VNII) started operating in 2005 with two reversible units located in caverns at depths higher than 320 m. The rapid growth of wind power capacity in the last years has increased the importance of the reversibility role and of water storage in existing reservoirs and led to the interest of Venda Nova III (VNIII), which was designed for two reversible power units and an underground hydraulic circuit (5.6 km long) almost parallel to the existing repowering scheme of VNII. Besides the direct contribution of these repowerings to the electric system, the favourable impact on the reduction of greenhouse gases emissions and of imported fossil fuels use was also considered. One important feature of this region located in granitic and schistose environment is that infiltration and recharge are quite important, enabling extensive use in water supply to small rural communities and agriculture. The eventual disturbance on groundwater regime, with impacts at the surface, has been one of the key analyses that had to be taken within this large amount of underground excavations. The impacts were monitored by controlling the surrounding springs, wells and piezometers, before, during and after the construction works. Flow and water level measurements are done to detect eventual surface disturbances over an area of almost 500 ha, monitoring 270 water points. The groundwater behaviour during VNII excavations allowed the prediction of the impacts on water levels during VNIII excavations, now ongoing. The task described in this paper essentially addresses the issues regarding impacts on groundwater levels before and during design construction and at operation.

Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten

Sie möchten Zugang zu diesem Inhalt erhalten? Dann informieren Sie sich jetzt über unsere Produkte:

Springer Professional "Wirtschaft+Technik"

Online-Abonnement

Mit Springer Professional "Wirtschaft+Technik" erhalten Sie Zugriff auf:

  • über 69.000 Bücher
  • über 500 Zeitschriften

aus folgenden Fachgebieten:

  • Automobil + Motoren
  • Bauwesen + Immobilien
  • Business IT + Informatik
  • Elektrotechnik + Elektronik
  • Energie + Umwelt
  • Finance + Banking
  • Management + Führung
  • Marketing + Vertrieb
  • Maschinenbau + Werkstoffe
  • Versicherung + Risiko

Testen Sie jetzt 30 Tage kostenlos.

Springer Professional "Technik"

Online-Abonnement

Mit Springer Professional "Technik" erhalten Sie Zugriff auf:

  • über 50.000 Bücher
  • über 380 Zeitschriften

aus folgenden Fachgebieten:

  • Automobil + Motoren
  • Bauwesen + Immobilien
  • Business IT + Informatik
  • Elektrotechnik + Elektronik
  • Energie + Umwelt
  • Maschinenbau + Werkstoffe




Testen Sie jetzt 30 Tage kostenlos.

Literatur
Über diesen Artikel

Weitere Artikel der Ausgabe 6/2015

Environmental Earth Sciences 6/2015 Zur Ausgabe