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Maximum Local Scour Depth at Bridge Piers under Unsteady Flow |
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| Authors: | Jihn-Sung Lai Wen-Yi Chang Chin-Lien Yen |
| Affiliation: | 1Associate Research Fellow, Hydrotech Research Institute; Associate Professor, Department of Bioenvironmental Systems Engineering, National Taiwan University (NTU), 158 Chow Shan Road, Taipei 106, Taiwan (corresponding author). E-mail: jslai525@ntu.edu.tw 2Associate Researcher, National Center for High-Performance Computing, No. 7 R&D 6th Rd., Hsinchu Science Park, Hsinchu, Taiwan. E-mail: c00wyc00@nchc.org.tw 3Professor Emeritus, Department of Civil Engineering; Senior Research Fellow, Hydrotech Research Institute, NTU, 158 Chow Shan Road, Taipei 106, Taiwan. E-mail: clyen@ntu.edu.tw |
| Abstract: | The temporal effect of hydrograph on local scour depth is investigated under clear-water scour condition. By analyzing the characteristics of scour-depth evolutions at bridge piers for different rising hydrographs, a relation for estimating the maximum scour depth in uniform sediment is proposed. In the relation, the flow unsteadiness effect is taken into account by an unsteady flow parameter combining the peak-flow intensity and time-to-peak factors. For nonuniform sediment with d84 employed as the effective sediment size, this relation can yield reasonably good results of the maximum scour depth under rising hydrograph. |
| Keywords: | Scour Bridges Piers Sediment Unsteady flow |