Abstract
The Kanyosha watershed is unstable due to the presence of several landslides, which occupy about 3% of the study area. They are causing major damage which costs expensive to the Government of Burundi as well as to the population residing there and their properties. Roads, schools, irrigation canals, houses, crop fields, etc., are in danger of collapse. These landslides are mostly naturally occurring but can sometimes be reactivated by heavy rains or human activities during the excavation of building materials from the river bed.In order to carry out this study, we used the multivariate statistical classification with weighting of the responsible parameters of landslides risk to reach the susceptibility map of mass movements in the Kanyosha watershed. Remote sensing, geology, morphometry and bibliography were the data sources for the different parameters. Google Earth images, ortho-photos and field prospecting helped us to identify the landslides needed to validate the susceptibility map.During the fieldwork, we observed 34 landslides of different types, which were superimposed on the mass movements susceptibility map obtained using the Analytic Hierarchy Process (AHP) and compared to previous studies in which the matrix indexing method was used. We found approximately similar results with the consideration of different scales of work. These reasons confirm the validity of the susceptibility map at the level of the Kanyosha watershed, a map which is an essential document for urban planning and land management.
Highlights
Bujumbura city, which is the political and economic capital of Burundi, is affected by many types of natural hazards, including landslides
Areas prone to landsliding are currently being built up due to rapid extension of Bujumbura city.to provide information needed to limit this hazard one needs to extend investigations to the region covered by watersheds of the five main rivers accross Bujumbura city, which will be referred to as Bujumbura region hereafter.In this respect, our contribution was limited to the watershed of the Kanyosha River.The aim of this study was to derive a map of susceptibility to landsliding in Kanyosha watershed from auxilliary information using the Analytic Hierarch Process (AHP)
Kanyosha watershed is an unstable zone due to landslides which occupy about 3% of the area. These landslides are causing important dammages, e.g. roads, schools, irrigation channels, houses, crops, etc.Most of these landslides are of natural origin but can be reactivated human activities, e.g. extraction of building materials in river beds
Summary
Bujumbura city, which is the political and economic capital of Burundi, is affected by many types of natural hazards, including landslides. The latter is responsible for loss of life among the population, the destruction of roads and houses, distrurbance in electrical power supply and loss of agricultural production [7]. Areas prone to landsliding are currently being built up due to rapid extension of Bujumbura city.to provide information needed to limit this hazard one needs to extend investigations to the region covered by watersheds of the five main rivers accross Bujumbura city, which will be referred to as Bujumbura region hereafter.In this respect, our contribution was limited to the watershed of the Kanyosha River.The aim of this study was to derive a map of susceptibility to landsliding in Kanyosha watershed from auxilliary information using the Analytic Hierarch Process (AHP)
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