Author(s): Un Ji; Woon Kwang Yeo; Wonmin Lee; Gwonhan Kim
Linked Author(s): Woon Kwang Yeo
Keywords: No Keywords
Abstract: Riprap filter should be installed around the pier to prevent riprap subsidence due to sediment winnowing or leaching between the riprap and bed layers. However, riprap protection without filters is commonly applied in the field because of ambiguous specifications, and technical and economical difficulties to install the filter layer. Therefore, the hydraulic experiments were conducted in this study to measure and analyze the riprap subsidence quantitatively with different conditions for thickness of riprap layer, approached velocity, sizes of riprap and bed material. As the velocity was increased and size of bed material and thickness of riprap layer were decreased, the subsidence was increased. Consequently, the dimensionless graph of riprap subsidence was developed using the synthesized experimental results. The results of this study could be employed as a standard criterion or predictor to evaluate the subsidence stability.
Year: 2009