Flood Hazard
& Risk Assessment
Flood is one of the most destructive natural hazards. With climate change and urbanization, the frequency and magnitude of flood and inundation events are increasing in many parts of the world. In particular, the ASEAN region is especially prone to floods. One of the main causes is heavy monsoon showers accelerate by high tide and drainage channels that lack the water conveyance capacity. As well as antecedent conditions of river networks, flood control facility, soil condition, from other phenomena such as storm surge, tsunami, dam failure, watercourse-blocked by landslide, etc.
The case study focuses on quick-rising floods caused by heavy rainfall over a short period, with integration of climate change impact on rainfall and sea level rise. Flood risk is calculated by a function of the flood hazard, the exposed values and their vulnerability
Here, the flood hazard is a component of natural event damaging humans and human property, the exposed values is a component of people or asset values under the flood hazard, and the vulnerability is a component of how susceptible to the flood hazard.
Scenario-based analysis (climate change impact scenarios)
Hazard mapping with different occurrence probabilities and risk mapping based on the average annual damage
based on project objectives, data availability and characteristics of target river basin
Develop future rainfall increase ratio for three time slice (2030, 2050 & 2080)
Vulnerability assessment; element-at-risk identification and qualitative and quantitative indicators.
Prepare Preliminary Flood Hazard and Risk Maps Prepare flood hazard and risk maps using QGIS, to identify areas at risk of flooding, and consequently to improve flood risk management and disaster preparedness. In this case study, preliminary flood hazard maps of river basin scale were created in accordance with 7 different probabilities and the 6 climate change scenarios. Preliminary flood risk maps were created based on average annual damage for 6 climate change scenarios.
ASEAN Project on Disaster Risk Reduction by Integrating Climate Change Projection into Flood and Landslide Risk Assessment (ASEAN DRR-CCA) is supported by the Government of Japan through the Japan-ASEAN Integration Fund (JAIF).
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