Advanced

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

CHIRINDJA, FARISSE JOAO LU ; Dahlin, Torleif LU ; Perttu, Nils; Steinbruch, Franziska and Owen, Richard (2016) In Hydrogeology Journal 24(6). p.1583-1592
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Electrical resistivity tomography . Magnetic resonance sounding . Unconsolidated sediments . Groundwater flow . Mozambique
in
Hydrogeology Journal
volume
24
issue
6
pages
10 pages
publisher
Springer
external identifiers
  • Scopus:84966389815
  • WOS:000382049400017
ISSN
1435-0157
DOI
10.1007/s10040-016-1422-y
language
English
LU publication?
yes
id
58a73dbd-db7a-439f-a37e-931385a55d33
date added to LUP
2016-06-14 15:04:00
date last changed
2017-01-10 10:39:20
@article{58a73dbd-db7a-439f-a37e-931385a55d33,
  abstract     = {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<br/>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.},
  author       = {CHIRINDJA, FARISSE JOAO and Dahlin, Torleif and Perttu, Nils and Steinbruch, Franziska and Owen, Richard},
  issn         = {1435-0157},
  keyword      = {Electrical resistivity tomography . Magnetic resonance sounding . Unconsolidated sediments . Groundwater flow . Mozambique},
  language     = {eng},
  month        = {05},
  number       = {6},
  pages        = {1583--1592},
  publisher    = {Springer},
  series       = {Hydrogeology Journal},
  title        = {Combined electrical resistivity tomography and magnetic resonance sounding investigation of the surface-water/groundwater interaction in the Urema Graben, Mozambique},
  url          = {http://dx.doi.org/10.1007/s10040-016-1422-y},
  volume       = {24},
  year         = {2016},
}