In this paper, solitary wave run-down height and the geometric characteristics of solitary wave-induced strewing of armor units are investigated. In the experiments, natural sand and grain having different diameters are used. Run-down heights for not armored and armored beaches are evaluated and empirical formulas are suggested. From the results of these experiments, it was observed that armor units caused a decrease of approximately 35% run-down height. The relation between the run-up and run-down height is given by a formula. Subsequently, the area along the slope that had to be protected (such as a pipeline) was to be considered. In the experiments, this area was protected in two different ways (Alternative I, Alternative II). The strewing of the armor units forming the protective layer was studied. It is concluded that Alternative II is more suitable than Alternative I for protected area. The most important variables strewing of armor units were defined by using experimental results. These variables are written as a dimensionless group named as par 3 by using π theory. The empirical formulas between the geometric characteristics of strewing of armor units and dimensionless group are proposed through regression analysis.
