Introduction of ICHARM research projects: Integrated analysis of water, sediment, and driftwood runoff from a basin during heavy rainfall: Development of a rainfall-sediment runoff (RSR) model [HARADA Daisuke, Research Specialist] / 研究紹介:豪雨時に流域から流出する水・土砂・流木の一体的解析 ―降雨- 土砂流出(RSR) モデルの開発―〔原田大輔 専門研究員〕