The importance of water cannot be overemphasized in sustaining life and maintaining public health. Water flow is also an important natural force in transporting sediments, nutrients, pollutants etc. In the forms of floods, storm surges, freak waves and tsunamis, it leaves huge swath of devastation. With the increasing exploitation of offshore resources, including marine renewables, study on the interactions between water flows, offshore structures and seabed becomes more and more important. Our increasing environmental awareness and recreational usage of waters demand a better understanding of the fate and distribution of pollutants, such as toxicants and pathogens, within water bodies.