岸礁礁冠对波浪增水影响的实验研究

o understand the role of reef crest in wave transformation and wave-induced setup over the reef, a series of experiments are carried out in a wave flume using idealized models that simulate fringing reefs with rectangle reef crest. Experimental results are reported for two water depths and a variety of regular wave conditions. Preliminary analysis shows that the presence of the reef crest is found to alter significantly the wave transformation process near the reef edge, especially the intensity of wave breaking and the generation of high harmonic waves. Wave setup is found to increase with the increase of incident wave height, but decrease with the increase of wave frequency and water depth. The reef crest controls the water level above the reef-top in a way similar to that a broad crest weir controls the water level in open channel flows, wave setup over reef flat with a crest is generally much larger than that without, a new dimensionless parameter to analyze the wave setup is introduced in order to take the crest configuration into consideration.