RAPID EXPOSURE ASSESSMENT OF NATIONWIDE RIVER FLOOD FOR DISASTER RISK REDUCTION
- 1International Centre for Water Hazard and Risk Management (ICHARM), PWRI, 1-6 Minamihara, Tsukuba, Ibaraki, Japan
- 2Dept. of Environmental Information, Tokyo University of Information Sciences, Wakaba, 1200-2 Chiba, Japan
- 3Flood Forecasting & Warning Center, Bangladesh Water Development Board, 1000 Dhaka, Bangladesh
- 4Center for Environmental Remote Sensing (CEReS), Chiba University, 1-33 Yayoi, Inage, Chiba, Japan
Keywords: Nationwide flood, MODIS, MLSWI, Affected people, Risk reduction
Abstract. considerably increased. For flood disaster risk reduction, it is important to identify and characterize flood area, locations (particularly lowland along rivers), and durations. For this purpose, flood mapping and monitoring are an imperative process and the fundamental part of risk management as well as emergency response. Our ultimate goal is to detect flood inundation areas over a nationwide scale despite limitations of optical and multispectral images, and to estimate flood risk in terms of affected people. We propose a methodological possibility to be used as a standard approach for nationwide rapid flood exposure assessment with the use of the multi-temporal Moderate Resolution Imaging Spectrometer (MODIS), a big contributor to progress in near-real-time flood mapping. The preliminary results in Bangladesh show that a propensity of flood risk change strongly depends on the temporal and spatial dynamics of exposure such as distributed population.