In this paper the theoretical analysis and calculating method of maximal impact caused by jet are presented and the formulas for calculation of the maximal impact of waves acting on the slope are developed. Through the comparison between the results of model tests with a model scale of 1:10 and those of prototype tests conducted in the same way in Big Wave Flume, Hannover, West Germany, the effects of model scale on the measurement of wave impact on slopes are expounded. In addition, a distribution regularity of the maximal impact pressure is also given.
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