Author(s): Sendong Liang; James Yang; Yongliang Zhang
Linked Author(s): James Yang
Keywords: Experimental study; Scour countermeasures; Waves; Current; Pile
Abstract: Four commonly used scour countermeasures, i. e. riprap, horizontal collar, tetrahedral frame and the combination of riprap and tetrahedral frames around a cylindrical pile are tested in a current-wave flume to examine their effects on scouring. The evolution of scour depth around the pile in regard of the scour countermeasures, subjected to the action of steady currents with or without irregular waves, and the bed topography change around the pile are evaluated. The range of scour and its erosion volume are estimated. A comparison between scour parameters with and without the countermeasures demonstrates the efficiency of the countermeasure in terms of the maximum scour depth. All of the tested countermeasures reduce the scour depth significantly. However, depending on the type of scour countermeasure adopted, the scour depth reduction efficiency varies considerably. The tests also show that it takes a longer time to reach the maximum scour depth in the current-wave conditions than only in the current conditions. For the majority of the cases, the scour range and volume subjected to the combined current-wave action is larger than only to the current action.
Year: 2013