Geography Reference
In-Depth Information
Chapter 10
U
SE OF
R
EMOTE
S
ENSING AND
GIS
FOR
G
ROUNDWATER
P
OTENTIAL
M
APPING IN
C
RYSTALLINE
B
ASEMENT
R
OCK
(S
ABODALA
M
INING
R
EGION
,
S
ENEGAL
)
I. Mall
*
, M. Diaw, H. D. Madioune, P. M. Ngom
and S. Faye
Department of Geology/Faculty of Sciences and Technology/UCAD
Dakar, Senegal
A
BSTRACT
Detection of favorable zones for sustainable groundwater supply in
terrains underlying by crystalline rocks needs to integrate two
approaches: Remote Sensing and GIS. Landsat ETM+ images are
processed by using ERDAS IMAGINE 9.2 and ASTER images by
ArcGIS 9.3. Parameters controlling groundwater accumulation such as:
rainfall, lineaments, lithology, slopes, and drainage network are evaluated
in terms of 5 potential classes namely: very good potentials, good;
moderate; low and very low potential and integrated in the GIS tool. The
resulting map shows that 5% of the study area presents a very good
groundwater potential and this part is mainly concentrated in the south
part of the study area and on the MTZ, very low potentials constitute 13%