In Japan, there is a place with danger of sediment]related disaster very a lot. In these places, it must be done measures construction immediately. However, it is very difficult to decide priority of construction from a lot of object points. Contrary to expectation, there has not been much progress to date as far as the construction of countermeasures against sediment]related disasters is concerned. Under such a situation, it is important to evaluate the safety of sediment]related disaster dangerous places and the effects of construction measures at present for efficiency in construction projects.
However, there is currently no unified analytical technique to address this issue and this poses a problem to each self]governing body. In this study, a critical line (CL) for determining the sediment]related disaster was set up in two situations ] one before the construction measures and the other after the construction measures, and evaluated the safety of sediment]related disaster dangerous places and the effects of construction measures was examined by measuring the safe domain areas for those CLs. Because this method is the statistical technique that used an existing database, it is advantageous in that new research or analysis is unnecessary. It is thought that this evaluation result is useful for a future plan of construction measures very much.


Key wordsFR.B.F.network, CLitical line, sediment]related disaster, slope failure, the effect of construction measure