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| 1 | Effect of trapezoidal collars as a scour countermeasure around wing-wall abutments显示文摘Local scour around bridge abutments is a widespread problem that can result in structural failure. Collars can be used as a countermeasure to reduce the scour depth. In this study, the temporal scour development around a wing-wall abutment was investigated with and without collars.The tests were carried out under clear-water conditions for different abutment lengths, with collars of different sizes placed at the bed level.When no collar was used in the experiments, 70% of the maximum scour depth occurred in less than 2 h. However, when a collar with a width greater than the length of the abutment was used, no scour was observed for up to 200 min from the beginning of the experiments. The results show that an increase in the collar width not only led to a lag time for the onset of scouring but also reduced the maximum scour depth.Moreover, an increased collar width led to a better performance in mitigating scouring around smaller abutments. Generally, the scour depth decreased by 9%-37% with different collar widths. | Payam Khosravinia Amir Malekpour Ali Hosseinzadehdalir Davod Farsadizadeh | 2018 | Water Science and Engineering2018，11，1： | 3 |
| 2 | Effect of Sinusoidal Corrugated Bed on Hydraulic Jump Characteristics显示文摘 | ABBASPOUR A HOSSEINZADEH DALIR A FARSADIZADEH D | 2009 | Journal of Hydro-enviroument Research2009，，3： | 1 |
| 3 | Effect of sinusoidal corrugated bed on hydraulic jump characteristics 显示文摘 | Abbaspour A Hosseinzadeh Dalir A Farsadizadeh D | 2009 | Journal of Hydro-environment Research2009，，3： | 1 |
| 4 | Numerical study of hydraulic jumps on corrugated beds using turbulence models显示文摘 | ABBASPOUR A FARSADIZADEH D DALIR A H SADRADD1NI A A | 2009 | Turkish Journal of Engineering and Environmental Sciences2009，33，1： | 1 |
| 5 | Effect of sinusoidal corrugated bed on hydraulic jump characteristics 显示文摘 | ABBASPOUR A HOSSEINZADEH D A FARSADIZADEH D | 2009 | Journal of Hydro-environment Research2009，，3： | 1 |
| 6 | Effect of sinusoidal corrugated bed on hydraulic jump characteristics显示文摘 | ABBASPOUR A HOSSEINZADEH DALIR A FARSADIZADEH D | | 0，，02： | 1 |
| 7 | Effect of sinusoidal corrugated bed on hydraulic jump characteristics显示文摘 | Abbaspour A Dalir A H Farsadizadeh D | 2009 | Journal of Hydro-enviromnent Research2009，，3： | 1 |
| 8 | Effect of sinusoidal corrugated bed on hydraulic jump characteristics显示文摘 | Abbaspour A Hosseinzadeh Dalir A Farsadizadeh D | | 0，，02： | 1 |
| 9 | Estimation of hydraulic jump on corrugated bed using artificial neural networks and genetic programming显示文摘Artificial neural networks (ANNs) and genetic programming (GP) have recently been used for the estimation of hydraulic data. In this study, they were used as alternative tools to estimate the characteristics of hydraulic jumps, such as the free surface location and energy dissipation. The dimensionless hydraulic parameters, including jump depth, jump length, and energy dissipation, were determined as functions of the Froude number and the height and length of corrugations. The estimations of the ANN and GP models were found to be in good agreement with the measured data. The results of the ANN model were compared with those of the GP model, showing that the proposed ANN models are much more accurate than the GP models. | Akram ABBASPOUR Davood FARSADIZADEH Mohammad Ali GHORBANI | 2013 | Water Science and Engineering2013，6，2： | 0 |
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