The stability of single-graded scour protections in steady current depends on similar dynamic responses as for two-layer solutions (Stability of armour stones, winnowing failure, edge scour), and have been studied in an experimental campaign comprising steady current in a wave/current flume. The results of the experimental campaign to explain the stability of single-graded scour protections in steady current is presented. The governing process in currents is the armouring of the top layers of the stone layer as the fines are washed out by winnowing. Over time the single-graded stone material makes a transition to a two layer configuration consisting of a protective armour layer and a underlying filter layer. The interface be-tween these two layers, termed the erosion level, is presented in design diagrams based the mobility parame-ter, gradation of the stone material and cover stone size.
|Title of host publication||Scour and Erosion IX: Proceedings of the 9th International Conference on Scour and Erosion (ICSE 2018)|
|Place of Publication||London|
|Publication status||Published - 2019|
|Event||9th International Conference on Scour and Erosion (ICSE 2018) - Taipei, Taiwan, Province of China|
Duration: 5 Nov 2018 → 8 Nov 2018
|Conference||9th International Conference on Scour and Erosion (ICSE 2018)|
|Country||Taiwan, Province of China|
|Period||05/11/2018 → 08/11/2018|
Petersen, T. U., Nielsen, A. W., Hansen, D. A., Pedersen, A. V., Christensen, E. D., & Fredsøe, J. (2019). Stability of single-graded scour protection around a monopile in current. In Y. Keh-Chia (Ed.), Scour and Erosion IX: Proceedings of the 9th International Conference on Scour and Erosion (ICSE 2018) (1st ed., pp. 175-181). London: CRC Press.