12:00 PM - 12:15 PM
[HDS07-12] Estimation of debris flow magnitude based on hydrogeomorphic characteristics in mountainous regions: case study of Ohya landslide, central Japan
Keywords:Debris flow, Groundwater dynamics, Hazard prediction, UAV
Debris flows, which are rapid and destructive movements of water, sediment, and organic material, could be serious hazards to communities located in mountainous regions. This research examines how hydrogeomorphic characteristics, particularly groundwater levels, overland flow discharges, and volume of debris flow materials, influence the intensity of debris flows, an area that is not as well understood as rainfall triggers. By analyzing field data from the Ohya Landslide region, the study investigates how changes in groundwater levels can help to estimate the magnitude of debris flows. Through a combination of stream-discharge monitoring, rainfall data, and numerical simulations, the study creates a predictive model to quantify the groundwater level in debris flow material and overland flow discharge in channel. The study also investigates volume of debris flow materials using unmanned aerial vehicle (UAV). The results are anticipated to uncover crucial groundwater thresholds that significantly increase debris flow magnitude. This research enhances debris flow evaluations by incorporating hydrological conditions (i.e., groundwater levels and overland flow discharges) volume of debris flow materials as essential factors, which could improve the prediction of debris flow characteristics in areas susceptible to both periodic and seasonal rainfall changes.