Main road 3, a major arterial road in Ethiopia, steeply climbs nearly 1, 500 meters over 40 kilometers through the Abay Gorge. It is plagued by landslides in the rainy season. Some of these are up to two kilometers wide, jeopardizing this vital link. To fundamentally solve this problem it is necessary to implement appropriate countermeasures after clarifying the mechanisms that trigger landslides in this stretch of road.
Therefore the authors have implemented a slope disaster inspection on roads to clarify the mechanisms in the Abay Gorge. To prepare the slope disaster inspection sheet in Ethiopia where there are few engineers who have experience on slope disaster inspection, the authors have discussed the factors and their contributions that affect on landslides and decided the item in the list on the slope disaster inspection sheet using multivariate statistical analysis, namely quantification theory.
Through the multivariate statistical analysis, the following was observed : `result of aerial photo interpretation' and `main rock formation of landslide body' should be paid attention, which affect the hazard of landslide greatly in the area. Based on the analysis, new evaluation sheets are proposed for the slope inspection on the roads, which are suitable to the conditions of geology and topography in Ethiopia. The authors have also ranked them into five levels from A (extremely high hazard) to E (lowest hazard) on the landslides in the Abay Gorge.
This report describes a case study of technical cooperation for building landslide hazard mapping system through a capacity building project in Tegucigalpa, Honduras. This mapping system is managed by Geographical Information System (GIS) which allows easy access to landslide information available on the university's website. The mapping system is useful for other areas beyond the scope of this project, because it includes a landslide hazard mapping training program for local residents.
Landslides constitute a common disaster across the world, including in Japan. Developing countries tend to suffer from severe damage owing to large-scale disasters, mainly due to the lack of appropriate research knowledge that can facilitate appropriate prior counter-measures. The Japan International Cooperation Agency (JICA) has implemented wide-ranging technical cooperation and financed structural measures for landslide prevention through grants and loans as well as technical cooperation. We have compiled a list of projects for sediment disaster prevention and protection under JICA to identify the chronological trends. The list indicates that the projects on sediment disaster prevention and protection were inaugurated in 1975, while most projects mainly focused on volcanic disaster management. Since 2000, the number of landslide research and prevention projects have increased. Further, it has become obvious that the landslide research and prevention works tend to be actively conducted in Asian countries as well as in Central American and African countries. To further reduce the risk of landslide disasters, JICA's knowledge and experiences that utilize Japanese know-hows and lessons for landslide management are essential for developing countries.