By using scaled-down laboratory experiments and computational fluid dynamics (CFD), our group are looking at the interface between flowing water and river bed where we can find sediment/rock transport because sometimes that lead to failure of important hydraulic infrastructure such as a bridge, dam, and levees during flooding. Using the outcomes from the laboratory experiment and CFD together with additional field measurements, big data analysis is also conducted by various type of artificial intelligence (AI) techniques. Specific research topics that we are focusing on are as follows: Finding types and causes of scouring around bridge and/or dam, and suggesting efficient protection measures; reducing amount of micro-plastic in storm-water; investigating fundamental mechanisms of rock plucking; exploring pathway of large rock in debris flow; and many other topics related to the eco-hydraulics.