Publicou 4 edições por ano
ISSN Imprimir: 1065-3090
ISSN On-line: 1940-4336
Indexed in
LASER-INDUCED IMAGE FOR WAVE MEASUREMENT
RESUMO
Understanding the wave shape in the near shore region and runup location at the shoreline are crucial to planning and design efforts in coastal engineering because all disasters in the coastal area are related to strong wave actions. A conventional wave gauge (e.g., pressure type or capacitance type) has difficulties in acquiring wave data in this region because the gauge may be out of water for a certain period of time, hence, calibration for the wave gauge is hard to achieve. At the same time, the flow field can be disturbed rigorously by the existence of a wave gauge, especially near a very shallow water region. A nonintrusive-type wave measurement technique is developed by using optical devices and processing the laser-induced image to get precise wave data without disturbing the flow/wave field because there is no gauge within the water body. Getting correct wave runup data or wave data in very shallow water, where an intrusive-type wave gauge is not appropriate, are other advantages for developing the nonintrusive wave measuring technique. Comparing the results with a precise capacitance-type wave gauge proved the laser-induced image wave-measuring system is a precise and reliable wave-measuring system. According to the experimental results, using the new wave-measuring technique can get very satisfactory wave data in the near shore region, where the wave data are not available for an intrusive instrument. The interesting contact line effect at the shoreline that is caused by the complicated interaction between the air-water-solid boundary was observed clearly by using the new wave-measuring technique.