| dc.description.abstract | Flash floods that occur suddenly, which cause damage to the weirs or
embankments, immediately threaten human life. Identifying the causes of a flash
flood is very important to reduce its negative impact. This paper examines changes
in flash flood disasters in the Wonoboyo watershed based on estimates of flash flood
hazard, land-use changes, and rainfall depth distribution patterns. The method of
predicting susceptibility to flash flood hazards is based on various environmental
factors that are integrated with GIS. Three bivariate statistics consisting of the Statistical Index (SI), Frequency Ratio (FR), and Predictor Rate (FP-PR) model are applied
to select the best Flash Susceptibility Index (FFHSI) model. Changes in land use are
then explored based on the conditioning factor for a flash flood. In the final stage, the
estimation of areal rainfall uses Inverse Distance Weighting (IDW) to describe the
position of rain and flash flood events. The best statistical bivariate statistical approach
for the FFHSI is FR. Assessment of environmental factors using the FFHSI shows
that 21% of the catchment area has moderate to high until very high vulnerability
levels. Changes in land cover significantly affect flash floods, especially changes
from forest to agricultural land or settlements. The distribution pattern and intensity
of rainfall are closely related to the location of the flash flood. This study results can
guide future flood mitigation measures. | en_US |
