Priority examination of Sabo improvement project based on evaluation of
vulnerable spots
for sediment]related disasters with Data Envelopment Analysis
Tomohisa FUKUDA, Hiroyuki OISHI, Wataru INOUE, Yousuke NISHIO and Kohei FURUKAWA
Abstract
Nagasaki is well]known as an area with many sediment]related disasters. On this
point of view, installation of erosion control facilities has been pushed forward
from the past. However, the installation ratio of the facilities has not always
been sufficient because there are too many points. Under the above conditions,
for installing the erosion control facilities effectively with limited budget,
it is important to consider a priority of an improvement project at each vulnerable
spots. Therefore this study performed examination based on an evaluation result
by Data Envelope Analysis (DEA) about priority of dangerous spots for sediment]related
disasters in Nagasaki. In this study, we used a new factor to evaluate importance
of vulnerable spots for sediment]related disasters as well as a factor used in
a study example of the past. As a result, a priority that reflects the characteristics
of its hazard and importance at each spots can be evaluated. It is recognized
that there is a correlation between the evaluated priority and past disaster histories
or counter]measure works. This shows that the DEA is proper for priority evaluation
and very effective technique for studying erosion control facility improvement
projects.