MODEL DEVELOPMENT FOR VISUALIZING RUNOFF COMPONENT IN FLOOD WATER

Abstract

 Agricultural drainage systems serve to eliminate floodwater not only from farmland but also from non-farmland in agricultural basins where urbanization is remarkable. To provide a quantitative evaluation for this issue, we have developed a model to visualize the runoff components of each land category contained in drained water during heavy rainfall. A tracer sub-model was constructed that traces rainwater falling on the target landuse by giving a tracer with a concentration of 1, and incorporated in the inundation analysis model developed in the previous research. As a result of applying this model to the area where rapid urbanization is in progress in recent years, it has been confirmed that components drained by the agricultural drainage pump station during flood peaks contains a large amount of rainwater derived from non-farmland, and contribute to inundation of farmland.