Fundamental and applied work on physical processes in coastal areas, including waves, currents, sediment transport, and morphological evolution. Developer of theoretical formulas, analytical formulations, empirical techniques, and numerical models for predicting a wide range of coastal processes. Experience with advanced data-analysis techniques and data-driven simulation methods. Studies on water flows in the environment and their impacts on water quality with a focus on rivers, lakes, and estuaries. Project experience for a large number of different countries, for example, the USA, Japan, Australia, China, Sri Lanka, Egypt, and Vietnam (in the four latter countries, under Sida sponsorship). Author of more than 230 journal articles, conference papers, and technical reports. Invited visiting researcher/professor at: Coastal and Hydraulics Laboratory (USA), Texas A&M University (USA), University of Sydney (Australia), University of Tokyo (Japan), University of Tsukuba (Japan), Nihon University (Japan), and Kyoto University (Japan).