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Combined electrical resistivity tomography and magnetic resonance sounding investigation of the surface-water/groundwater interaction in the Urema Graben, Mozambique

Författare

  • FARISSE JOAO CHIRINDJA
  • Torleif Dahlin
  • Nils Perttu
  • Franziska Steinbruch
  • Richard Owen

Summary, in English

This study focusses on the hydrogeology of Urema Graben, especially possible interactions between surface water and groundwater around Lake Urema, in Gorongosa National Park (GNP). Lake Urema is the only permanent water source for wildlife inside GNP, and there are concerns that it will disappear due to interferences in surface-water/groundwater interactions as a result of changes in the hydraulic environment. As the lake is the only permanent water source, this
would be a disaster for the ecosystem of the park. The subsurface geology in Urema Graben was investigated by 20 km of electrical resistivity tomography (ERT) and three magnetic resonance sounding (MRS) surveys. The average depth penetration was 60 and 100 m, respectively. The location of the ERT lines was decided based on general rift morphology and therefore orientated perpendicular to Urema Graben, from the transitional areas of the margins of the Barue platform in the west to the Cheringoma plateau escarpments in the east. ERT andMRS both indicate a second aquifer, where Urema Lake is a window of the first upper semi-confined aquifer, while the lower aquifer is confined by a clay layer 30–40 m thick. The location and depth of this aquifer suggest that it is probably linked to the Pungwe River which could be a main source of recharge during the dry season. If a dam or any other infrastructure is constructed in Pungwe River upstream ofGNP, the groundwater level will decrease which could lead to drying out of Urema Lake.

Avdelning/ar

Publiceringsår

2016-05-05

Språk

Engelska

Sidor

1583-1592

Publikation/Tidskrift/Serie

Hydrogeology Journal

Volym

24

Issue

6

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Oceanography, Hydrology, Water Resources

Nyckelord

  • Electrical resistivity tomography . Magnetic resonance sounding . Unconsolidated sediments . Groundwater flow . Mozambique

Status

Published

Projekt

  • Groundwater Resources Mapping in Mozambique

ISBN/ISSN/Övrigt

  • ISSN: 1435-0157