Journal of Shanghai Jiao Tong University ›› 2022, Vol. 56 ›› Issue (5): 664-674.doi: 10.16183/j.cnki.jsjtu.2020.346

• Naval Architecture, Ocean and Civil Engineering • Previous Articles     Next Articles

Effect of Porosity on Local Scour Around Circular Array of Cylinders in Steady Currents

LIU Shihang1, LOU Xiaofan1, TANG Guoqiang1(), WANG Bin2   

  1. 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology,Dalian 116024, Liaoning, China
    2. Key Laboratory of Far-Shore Wind Power Technology of Zhejiang Province, Hangzhou 311122, China
  • Received:2020-10-22 Online:2022-05-28 Published:2022-06-07
  • Contact: TANG Guoqiang


The local scour around a circular array of cylindrical piles through physical model was studied under the live-bed condition, concerning the effect of porosity of the structure on the local scour development. The porosity of the model was achieved by varying the number of single piles, while the outer diameter of pile groups was kept as a constant. The effect of porosity on the equilibrium scour depth, the scour extent, and the time scale of scour was examined. It is found that the scour around the pile group is significantly affected by the porosity of the structure. As p>0.7, the resultant scour is mainly determined by the scour around each individual pile. As p<0.5, the scour is characterized by the pattern of one single pile with the same outer diameter as the pile group. As 0.5<p<0.7, the scour shows a pattern of transition from local scour to global scour. It is also found that the normalized equilibrium scour depth is a power function of p, with a power of approximately 0.67.

Key words: local scour, steady current, pile group, porosity

CLC Number: