As tsunami wave may evolve into a wave train consisted of several isolated solitary waves during its propagation in the offshore area. In order to clarify the interaction mechanism between this wave train and coastal structures, well-designed run-up experiment and numerical simulation of double solitary waves were carried out. It turns out that, with regard to double solitary waves with same height, run-up amplification coefficient of the latter wave is less than the leading one when the relative wave crest distance is reduced to a certain threshold value. The detailed velocity field and energy budget were obtained using the numerical model.

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