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Dynamic Floodplain Visualization of Unsteady Flood Models using Geographic Information Systems (Case study: The Downstream Ciliwung, Jakarta, Indonesia)
Thesis Abstract:
Downstream Ciliwung in Jakarta was the focus of the study for the reason that flooding has always been a constant problem to both the immediate residents and the local government. Local planners and decision makers are in need of accurate information on the spatial distribution, magnitude and depth of flooding, and land use affected by it. The objectives of this research were to predict design flood for site along a river, and to create dynamic floodplain visualization of Downstream Ciliwung by integrating HEC-RAS hydraulic modeling and ArcView GIS.
The results of this study provided information on the unsteady flow hydraulic model method as well as the advantages it has over steady flow hydraulic models. The HEC-RAS model’s stream geometry was extracted from the digital terrain model, which ensured that the flood plain’s extent was fully accounted for. The results of the HEC-RAS unsteady flow model were also compared to the HEC-RAS steady flow model based on steady flow peak runoff discharge values.
Flood delineation in the HEC-GeoRAS post-processor was simple, but animation processing was tedious. This procedure required numerous geographic information system (GIS) export file development iterations from the HEC-RAS interface. Once accomplished, each time step was copied with a screen captured image and pasted into an animation software tool to develop an animated graphics interchange format (GIF) of the flood event. Overall, the results of the research indicated that GIS is an effective environment for floodplain mapping and analyis.