Abstract
The Geotextile Mattress with Floating Plate (GMFP) is a novel scour prevention structure. This paper provides an insight into the effects on the flow pattern near the GMFP to better understand the GMFP working mechanism. The GMFP design parameters were emphasized, including the sloping angle, the height of the floating plate, and the opening ratio. In most cases, the bottom vortex is located immediately downstream to the GMFP. The near bottom velocity downstream to the bottom vortex is remarkably lower than the undisturbed value. The location variation of the bottom vortex reattachment point with the GMFP design parameters was studied. Within the range of hydrodynamic parameters tested, the reattachment point moves upstream when the opening ratio increases over 0.231, which agrees with previous studies. With the increase of the obstruction height of the floating plate, the reattachment point tends to move downstream when the relative obstruction height is below 0.2, and then retreats to the upstream side, which may be attributed to the variation in the water surface profile and the enhanced flow through the sand-pass gap due to the intensified blockage effect. An equation was proposed to predict the location of the reattachment based on the GMFP obstruction height.
Published Version
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