TY - JOUR ID - 10173 TI - Effect of Hydrograph Peak Time on Local Scour around Bridge Pier JO - Journal of Hydraulics JA - JHYD LA - en SN - 2345-4237 AU - Karimaee Tabarestani, M. AU - Zarrati, A. R. AD - PhD Graduate, Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran. AD - Professor, Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran. Y1 - 2014 PY - 2014 VL - 9 IS - 3 SP - 15 EP - 32 KW - Scour Around Bridge Pier KW - flood hydrograph KW - Peak Time KW - Stepped-Hydrograph Model DO - 10.30482/jhyd.2014.10173 N2 - In the present study effect of hydrograph peak time on local scour around bridge pier is studied. Hydrographs with one discharge peak as well as double discharge peaks were generated in the labaratory. The duration time for some of these hydrographs were so short that could be considered as flash flood occuring in arid or semi-arid zone rivers. In each experiment, development of scour depth with time was measured by small cameras. Results showed that for hydrogaphs with similar duration, parameter of peak time or sequence of peaks in double discharge peak has negligible effect on final scour depth but considerable effect on time development of scour depth. Furthermore, time developmet of scour depth for present hydrographs are calculated by stepped- hydrograph model and empirical equations presented in the literature for steady flow. Results also showed high descrepancy between calculated and measured data for time development of scour depth and all of the final calculated scour depths are larger than experimental ones. In the best case, the average error for final calculated scour depth is about 10%. UR - https://jhyd.iha.ir/article_10173.html L1 - https://jhyd.iha.ir/article_10173_8d71457e33633cbc26d3ff03a4ed6e21.pdf ER -