Results of hydraulic laboratory tests of an idealized rockfall are presented, with the main parameters being the ratio of rockfall width to water depth, λ/d, and a Froude number based upon the ratio of the average rockfall velocity to gd.5. For a rather large range of these two parameters, a linear theory for the generation of water waves by a similar mechanism is shown to be useful as a guide to interpreting the results. For large values of the two parameters, especially λ/d, the linear theory of marginal usefulness. It is shown by means of the results of two similar tests, with a geometric scale ratio of 1:4, that a small model test can be used to predict the results to be expected from a large model test even in the range where bores form, provided the velocity time histories of the falling rock are similar.
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Wiegel et al. (1970) studied this question.