1982 年 2 巻 4 号 p. 27-43
Fluid dynamic characteristis of jet, which is one of interesting topics in turbulent flow research, have been studied by many reseachers.
Although recent some trials to apply coherent vortex structure theory on the study of turbulent jet are considered being interest to the author, it is considered that almost all exsisting researches are either theoritical or experimental ones. In this paper, the author tries to indicate some derterministic features of the turbulent buoyant jet as well as non-buoyant jet in straits and coastal zones by remote sensing including aero photograph, colour analysis of sound echo and Landsat data analysis. Physical model studies are also introduced to supplement the analyses.
With analysis of field observation data of tidal jet in Naruto strait, the anthor shows that dynamic vortices shall be generated along shear layers when the jet strouhal number at the end of potential core is of 0.2 through 0.5. The colour sonar analysis shows definitely vertical profiles of the above coherent vortices. With regarding to the jet characteristics in the far field, Landsat data of several buoyant jets discharged into Japan sea from rivers including Shyo, Kuzuryu, Tedori and Mogamic are discussed.