In this study, we reproduced avalanches and debris flow phenomena using the debris flow analysis tool, iRIC Morpho2DH, and laboratory-test apparatus. In the laboratory tests, we reproduced aggregates of snow, water, and soil that form during avalanches and debris flows using a pot mill turntable. Consequently, the possibility of forming aggregates of snow, water, and soil during debris flow phenomena was analyzed. Evaluation of avalanche and debris flow phenomena during the snowmelt season was conducted by considering the characteristics of these aggregates. Based on the results, the validity of the analysis method for the Nozuka disaster in Japan was examined. Moreover, the risks associated with future avalanches and debris flow phenomena under changing climatic conditions were studied using the Policy Decision making for Future climate change (d4PDF) database.