Author(s): Taehoon Yoon; Sung Bum Yoon
Linked Author(s): Sung Bum Yoon
Keywords: No Keywords
Abstract: To evaluate the accuracy and applicability of existing riprap design equations for the protection of local scour around a circular bridge pier extensive experinments were conducted. The evaluations of each design formula are made through the comparisons of calculated and observed diameters of riprap stones. Most of the design equations are based on the approach velocity of stream, and other factors such as pier width and flow depth are ignored partially or completely. Even inadequate inclusion of such effects are found. As a result, the design values are generally overestimated or underestimated in comparison with the experimental data. The equations proposed by Richardson et al. and Parol a give relatively accurate results. A need for improved design formula which reflects the effects of both pier width and water depth is raised.
Year: 1997