Flood Hazard Assessment with High Spatial Resolution under Climate Change Scenario

Abstract

One of the important components in flood disaster risk reduction is the availability of spatial information on flood risk that include: (1) flood hazard component such as flood discharge ( q), flood depth (h), flood extent (A ), and flood duration (t), and (2) the loss value due to flood which could be quantified in the form of damage costs (θ). Change in the value of risk f (h, A, t, θ) was hypothesized to be sensitive to climate change and other environmental factors that exist at a river basin area. Therefore, it is quite important to control the flood disaster risk as a part of adaptation programs to the climate change impacts and to deal with the increasing pressure due to anthropogenic activities. Additionally, to support the action plan and to increase the understanding and awareness related to the flood disaster mitigation, spatial information on flood risk which having high resolution and precision is required. This study aimed to quantify the spatial information of flood hazard with high spatial resolution. Two Dimensional (2-D) flood-modelling system (e.g., rainfall-runoff-inundation) at the river basin scale has been used as the main method in quantifying the flood hazard dimension. Furthermore, this study was focused in the Batanghari River basin, Sumatra and 13 river catchments flow out through the Jakarta Capital City of Indonesia. Obtained hazard information forms the basis for long term management decisions on improving operational flood risk management, especially in order to cope with impacts of the future climate change.