バングラデシュ・ガイバンダにおけるネスティングモデルを用いたハザードマップの作成

Abstract

The main objective of this study was to map the hazards of river flooding in the Jamuna River by using a two-dimensional flood simulation model. In order to perform a flooding analysis on the inter-district and district scales simultaneously, we developed a nested flood simulation model. We performed a year-round flooding simulation for 2007, and a flood hazard map was produced with the discharge data of 100 return periods through a flood frequency analysis. For the geological information, we used satellite elevation data of satellite radar topography mission (SRTM), and digital elevation models (DEMs) with 30- and 6-ark second grids were used for the inter-district and district-scale analyses, respectively. We successfully simulated the flooding for 2007, validating the extent of flooding using satellite images. In addition, a flood hazard map was produced with important infrastructures, such as embankments, roads, and hospitals, needing evacuation.