Flood disaster evacuation route choice in Indonesian urban riverbank kampong: Exploring the role of individual characteristics, path risk elements, and path network configuration

Abstract

Emergency evacuation is regarded as the most important disaster response action for protecting human life from potentially lethal threats. Despite growing research aimed at evaluating and modelling evacuation for strategic flood disaster preparedness, remarkably little is known about how informal settlement dwellers realized and negotiated surrounding environment for evacuation path route choice. The purpose of this paper is to analyze the dynamic interaction between human characteristics, path risk elements, and path network configuration in constructing flood evacuation route choices based on two cases study of urban riverbank kampongs in Yogyakarta, Indonesia. To understand these interactions, we applied a mixed method based on a qualitative research approach, which included (1) walking evacuation simulation with video analysis to understand the informality practices and kampong's space setting, (2) an analysis of dweller's narrative experience collected from walking interviews, (3) computational path network configuration analysis using space syntax. Our findings suggest that kampong dwellers selected evacuation routes differently based on their individual capacity, the safety performance of path design, and path network characteristics in accommodating the safest travel. When juxtaposing space syntax results with walking evacuation simulation, the individual evacuation route choice is highly related to space syntax measures (normalized angular choice at local radii), implying that the majority of residents still prefer to walk on the straightest route (the route with the least angular deviation) to reach the assembly/exit points. Furthermore, this research demonstrates that not all residents have the same capabilities to walk on the straightest evacuation route due to physical capacity and limitation that relates to gender and ages differences in negotiating path risk elements. The use of mixed method approaches provided a practical insight into emphasizing the human-centered perspective in planning an effective flood emergency evacuation for informal riverbank settlements through spatial design, planning, that respect vulnerable groups.