Hydrological risk: Modelling flood memory and human proximity to rivers

Abstract:

Recent literature in sociohydrology has shown the important role of flood memory in shaping hydrological risk. We present a system dynamics model of human-flood interactions that simulates how the river proximity of human settlements is altered by changes in flood memory. We also compare our model outcomes with an unprecedented dataset consisting of historical and archeological observations of human settlements in Czech Republic that have been affected by major flood events. This comparison allows us to evaluate the potentials and limitations of our sociohydrological model in capturing essential features of flood risk changes, including the process of resettling farther and closer to the river. Our results show that the accumulation (and decay) of collective memory has potential in explaining temporal changes of flood risk driven by the occurrence (or absence) of major events. As such, this study contributes to advancing knowledge about the complex dynamics of human-water systems, while providing useful insights in the field of flood risk reduction.