Suction removal of sediment from between armour blocks. Part 2. Waves

Figen Hatipoglu Dixen, B. Mutlu Sumer, Jørgen Fredsøe

Research output: Contribution to journalJournal articleResearchpeer-review


When a stone/armor layer on a sand bed is exposed to flow, the sand underneath will be agitated by the flow turbulence. When the flow velocity reaches a critical value, the sand will be sucked (winnowed out) from between the armor blocks. In a previous investigation, we studied suction removal of sediment in steady currents. The present study is an extension of our previous investigation to waves. The critical condition for the onset of suction is determined. It is found that the onset of suction is governed by three parameters: (1) the sediment mobility number (based on the sediment size); (2) the ratio of sediment size to stone size, d/D; and (3) the Keulegan-Carpenter (KC) number, based on the armor block/stone size. The variation of the critical mobility number for suction as a function of d/D and KC is determined for the ranges of the parameters 0.001 <d/D
Original languageEnglish
JournalJournal of Hydraulic Engineering, ASCE
Issue number10
Pages (from-to)1405-1420
Publication statusPublished - 2008

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