EXPERIMENTAL STUDY ON CHANGE OF OVERFLOW STRUCTURE FLOW DURING EMBANKMENT EROSION AND EFFECT OF PROTECTION WORK FOR TOE OF SLOPE

Abstract

 The present study aims to investigate the effect of protection work for slope and toe of slope on embankment erosion due to overflow by laboratory experiments. For four cases with different lengths of protection work, we examined the depth of scour hole and embankment collapse due to overflow. Next, PIV measurements were performed to investigate the flow velocity in scour hole.

 For long protection work case, the angle of the overflow at toe of slope decreases and scour hole depth was reduced. Consequently, the sediment of embankment was not sucked out and the collapse time of embankment increases. For short protection work case, after the scour hole depth increases, the angle of the overflow at toe of slope decreases and the erosion speed reduces.