Landslide Assessment & Prevention of Future Risks
Monts BAMBOUTOS, CAMEROON
September 2003 / May 2004
PARBLEU Technologies Inc. risk assessment products page for the Monts
BAMBOUTOS, in CAMEROON :
The disaster :
In June-July 2003, a series of important landslides happened in the
Monts Bamboutos (Cameroon) and in their surroundings, causing a large number of
casualities and leaving many people homeless.
In particular, the landslide at Maghah caused 20 deaths, the one in Batibo 3
deaths, the one in Bafou 2 deaths, and the most important, at Wabane caused one
death and very important material damage. 309 houses have been destroyed.
These landslides are associated to the very heavy precipitations of the rain
season in 2003 (rain season from end of May to end of October).
They are becoming now a recurrent threat in these areas which are located in
very strong relief of volcanic origine.
In front of what is now considered a permanent high risk, and in the expectable
perspective of generalized landslides and of a major disaster in these densely
populated mountains, the local and national authorities remain powerless with
regard to the decisions to be taken.
In any case, accurate regional mapping was considered an urgent necessity, to
determine the risk areas, and to define the sectors where the population could
eventually be moved into safety.
Location of the study area in Cameroon
||Mean climatic conditions (rainfall &
temperature in the lowlands)|
Status of operations :
- Request received from the "Centre de Recherche des Hautes Terres",
University of Dschang, and from the Cameroon Environmental Watch (CEW), on
September 21, 2003.
Other users are: the Cameroonese Red-Cross, the "Institut National de
Cartographie", the communes, the prefectures, etc.
- Collection of satellite imagery: ERS-1 SAR (2 frames), LANDSAT-4 TM (1
frame), LANDSAT-5 TM (1 frame), LANDSAT-7 ETM+ (2 frames), and LANDSAT-7 PAN (2
frames), September/December 2003.
- A RADARSAT-1 SAR Image (SGC, standart beam S7) has been acquired by RADARSAT
International on November 11, 2003, and has been made available to the project
by the Canadian Space Agency.
- Field trip to the Bamboutos mountains in Cameroon, with documentation of the
landslides, and collection of GPS mesurements. Local contact and meetings with
the end-users. (December 2003 - January 2004)
- A first database containing satellite imagery from 1988 to 2003 as well as
topographic maps built using satellite radar (SAR) imagery has been delivered to
the end-users at the end of February 2004.
This database forms the base of a regional Geographic Information System (SIG),
in order to spatialize all the related information collected.
- This delivery has been done timely, before the rain season of 2004, which is
when a new series of landslides will occur.
- The project is still going on, since the threat is still present, and the
rain season, which favors the landslides, is closing :
- Collection of additional satellite imagery
- Collection of ancillary information
- Integration into a regional Geographic Information System (SIG)
- In May 2004, the integration and analysis of a
TERRA-1 ASTER image acquired on March 08, 2004 contributes to the
identification of landslides risks for the coming rain season, in the summer
Photography by Appolinaire
The area that has been surveyed extends over 70 x 50 kilometers (latitude
5°15' to 5°50' N / longitude 9°50' to 10°15' E).
All satellite maps shown in these pages are produced in cartographic
projection UTM WGS 1984 (Zone 32 N), and at a spatial resolution of 30x30 meters
and/or 15x15 meters.
THE MAIN THREATENED AREA : THE GREAT
OTHER THREATENED AREAS IDENTIFIED FROM
THE TOPOGRAPHY OF THE MONTS BAMBOUTOS :
THE THREATS FOR THE 2004 RAIN SEASON :
Related Pages at the
NASA Earth Observatory
(June 02, 2004) :
Produced by PARBLEU TECHNOLOGIES Inc.
- Procurement of the original RADARSAT-1 SAR image: Canadian Space Agency
(CSA), and Radarsat International Inc. (under CSA Contract).
- Procurement of the original ERS-1 SAR frames: Global Rain Forest Monitoring
project (GRFM) - Central Africa - (under Pilot Project granted by the Joint
Research Center of the EU).
- Procurement of the LANDSAT-4, LANDSAT-5 and LANDSAT-7 (TM, ETM+ and
Panchromatic) images: Courtesy of the University of Maryland, Global Land Cover
- Procurement of the TERRA-1 ASTER image: Courtesy of MITI, ERSDAC, JAROS,
and the U.S./Japan ASTER Science Team
Operational partners of PARBLEU TECHNOLOGIES Inc. :
Copyright (C) PARBLEU Technologies Inc., 2003/2004