Lessons learned from Use of Large-Scale Particle Image Velocimetry in Shallow-Low-velocity Flows and Floods

摘要

Large-Scale Particle Image Velocimetry (LSPIV) has been developed for more than a decade for a variety of laboratory and filed situations. The technique has been tested against conventional instrument and proved to be within acceptable uncertainty range (about 5%). The most distinctive feature of LSPIV compared with the conventional velocimeters, however, is its non-intrusive characteristics. This feature allows to carry out velocity measurements under extreme flow conditions which presents many difficulties for conventional instruments. During the more than a decade use of LSPIV, the researchers has gathered useful information for further perfecting LSPIV as well as practical lessons with respect to LSPIV use in various measurement environments and situations. This paper summarizes some of these LSPIV implementation aspects. Specifically, lessons learned on the seeding in natural streams and the areas of applications where LSPIV can efficiently complement or exceed the capabilities of the conventional velocity and discharge estimation techniques and instruments are presented.