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The characteristics of velocity fields of the external and boundary layer flows during run-up motion of a non-breaking solitary wave propagating over a 1:3 sloping beach are explored experimentally. Flow visualization technique (FVT) of particle trajectory photography and high-speed particle image velocimetry (HSPIV) were employed to qualitatively observe and quantitatively measure the macro-viewed external and micro-viewed boundary layer flow fields. The experiments were conducted in wave flume equipped with a wave maker being triggered by a precise servo-motor. The incident wave-height to water-depth ratios, H0/h0, is equal to 0.363. The slope of the sloping beach model is fixed at 1:3. Profoundly distinct characteristics of flow fields around the flow demarcation curves, as observed respectively from the macro-viewed external flow and the micro-viewed boundary layer flow, are first interpreted, together with elucidation of the flow reversal exhibiting wall-jet-like feature. A promising similarity profile of the flow reversal underlying the flow demarcation curve is proposed by selecting the characteristic length and velocity scales in the boundary layer flow. Keywords— velocity field, flow visualization, high-speed particle image velocimetry, wall jet

Velocity Fields of External and Boundary Layer Flows during Run up Phase of a Solitary Wave Traveling on a Sloping Beach