A variety of turbulent flows observed in nature are driven by sources of buoyancy. The interaction of such sources with the surrounding flow is generally characterized as plumes in crossflow. Figure 1 is an example. The plume in crossflow is produced in the laboratory by discharging buoyant water from a pipe of diameter \(D =\) 1 cm at a velocity \(U_o= 0.25\) m/s into a crossflow of velocity \(U_a=0.063\) m/s. The LIF (Laser Induced Fluorescence) imagesAdvected line thermallaser-induced fluorescence image in the figure show the structure of the turbulence and the concentration profile on the plane of symmerty.