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Majid Bavandpour
Civil Engineering Department, K.N.TOOSI University of Technology, Tehran, Iran

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Research article
Published: 05 May 2021 in Marine Georesources & Geotechnology
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In this study, laboratory experiments are conducted to assess the effects of a set of novel ring-type collars and prevalent spiral threading around a circular pier on scouring in a clear-water flow regime in non-cohesive bed materials. Also, numerical simulations are conducted to reveal the flow field in the scour hole around a pier with spiral threading. Various angles and spacings of the ring collars are considered to find the best configuration. Moreover, four test scenarios of spiral threading with different elevation levels are considered to investigate the optimum upper bound of spiral threading elevation. Results show that the ring collars (Angle = 45˚, relative spacing = 4/3 of pier diameter) are the best configuration and reduce the scour depth by 29% according to the scour depth around a plain pier. This configuration of ring collars reduces maximum scour depth three times better than the best configuration of single spiral threading (suggested by previous research). Furthermore, the ring collars reduce the scour rate while the spiral threading has no considerable effect on the scour rate. The spiral threading under the initial bed level plays a major role in reducing local scour.

ACS Style

Saeed-Reza Sabbagh-Yazdi; Majid Bavandpour. Introducing ring collars and effective spiral threading elevation for cylindrical pier scour control. Marine Georesources & Geotechnology 2021, 1 -16.

AMA Style

Saeed-Reza Sabbagh-Yazdi, Majid Bavandpour. Introducing ring collars and effective spiral threading elevation for cylindrical pier scour control. Marine Georesources & Geotechnology. 2021; ():1-16.

Chicago/Turabian Style

Saeed-Reza Sabbagh-Yazdi; Majid Bavandpour. 2021. "Introducing ring collars and effective spiral threading elevation for cylindrical pier scour control." Marine Georesources & Geotechnology , no. : 1-16.

Journal article
Published: 13 July 2020 in Journal of Hydrology
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Poor forecasting of climate variables at river basin scale, leads to situations which entail considerable risks and losses in various sectors such as the agriculture, the environment and water resources. Lack of accurate sub-seasonal and seasonal precipitation predictions are major management and operation predicaments in the transboundary Sistan Basin, located in Afghanistan and Iran, and selected as the case study in this paper. The outputs of the North-American Multi Model Ensemble (NMME), as a seasonal forecasting system, were utilized in the target region. In order to evaluate the performance of the raw outputs of four NMME models (namely: NCEP-CFSv2, CMC-CanCM3, CMC2-CanCM4, NCAR-CCSM4), the individual model ensemble mean was compared to the observations. Results highlighted the need for post-processing of the NMME outputs. For this purpose, three different commonly used methods, including GrandNMME, bias correction quantile mapping (QM) and Copula approaches, alongside a novel hybrid technique, were applied to improve future predictions of precipitation patterns for the hindcast period of 1982–2010 and forecast period of 2012–2016. All four methods were performed for each month in each 0.5-degree cell over the following one to six months. The findings demonstrated the performance of different NMME models were not the same over time and space. Among the models, the NCEP-CFSv2 and CMC2-CanCM4 seemed to best capture the spatial variability of precipitation in the study area. In addition, they performed better in estimating the amounts of precipitation. Among the methods, the QM, the Copula and the hybrid were all successful in improving the geographic patterns of the data. Furthermore, they were all able to enhance the accuracy of the data. At different timescales, the hybrid method showed substantial improvements over the seasonal predictions. Overall, the findings illustrated that collective use of methods may narrow the potential uncertainty in projections of regional changes.

ACS Style

Farhad Yazdandoost; Sogol Moradian; Mina Zakipour; Ardalan Izadi; Majid Bavandpour. Improving the precipitation forecasts of the North-American multi model ensemble (NMME) over Sistan basin. Journal of Hydrology 2020, 590, 125263 .

AMA Style

Farhad Yazdandoost, Sogol Moradian, Mina Zakipour, Ardalan Izadi, Majid Bavandpour. Improving the precipitation forecasts of the North-American multi model ensemble (NMME) over Sistan basin. Journal of Hydrology. 2020; 590 ():125263.

Chicago/Turabian Style

Farhad Yazdandoost; Sogol Moradian; Mina Zakipour; Ardalan Izadi; Majid Bavandpour. 2020. "Improving the precipitation forecasts of the North-American multi model ensemble (NMME) over Sistan basin." Journal of Hydrology 590, no. : 125263.

Journal article
Published: 01 November 2019 in Journal of Fluids and Structures
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ACS Style

Saeed-Reza Sabbagh-Yazdi; Majid Bavandpour. Numerical experiments on using incline collar rings for controlling mean and fluctuating forces on circular bridge piers. Journal of Fluids and Structures 2019, 91, 1 .

AMA Style

Saeed-Reza Sabbagh-Yazdi, Majid Bavandpour. Numerical experiments on using incline collar rings for controlling mean and fluctuating forces on circular bridge piers. Journal of Fluids and Structures. 2019; 91 ():1.

Chicago/Turabian Style

Saeed-Reza Sabbagh-Yazdi; Majid Bavandpour. 2019. "Numerical experiments on using incline collar rings for controlling mean and fluctuating forces on circular bridge piers." Journal of Fluids and Structures 91, no. : 1.

Journal article
Published: 10 May 2019 in Geosciences
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The interactions between free surface waves and layers of cohesive sediments including wave height attenuation and mud movement are of great importance in coastal and marine engineering. In this study, the results from a new analytical model were compared with those from literature experimental works and analytical models in terms of wave height dissipation rate and mud velocity. It was found that the new model provided good agreements in the case of coexisting waves and currents, while the literature model of Ng (explained in Section 2 of the text) —assuming the mud layer as a highly viscous layer with high shear rates—matched well with the experimental data for high viscosity (mud viscosity, νm = O [0.01 m2/s]). In addition, it was found that the new model is able to successfully simulate particles velocity in the presence of co-current.

ACS Style

S. Hadi Shamsnia; Mohsen Soltanpour; Majid Bavandpour; Carlo Gualtieri. A Study of Wave Dissipation Rate and Particles Velocity in Muddy Beds. Geosciences 2019, 9, 212 .

AMA Style

S. Hadi Shamsnia, Mohsen Soltanpour, Majid Bavandpour, Carlo Gualtieri. A Study of Wave Dissipation Rate and Particles Velocity in Muddy Beds. Geosciences. 2019; 9 (5):212.

Chicago/Turabian Style

S. Hadi Shamsnia; Mohsen Soltanpour; Majid Bavandpour; Carlo Gualtieri. 2019. "A Study of Wave Dissipation Rate and Particles Velocity in Muddy Beds." Geosciences 9, no. 5: 212.

Journal article
Published: 30 June 2017 in ISH Journal of Hydraulic Engineering
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ACS Style

Omid Aminoroayaie Yamini; M. R. Kavianpour; S. Hooman Mousavi; Azin Movahedi; Majid Bavandpour. Experimental investigation of pressure fluctuation on the bed of compound flip buckets. ISH Journal of Hydraulic Engineering 2017, 24, 45 -52.

AMA Style

Omid Aminoroayaie Yamini, M. R. Kavianpour, S. Hooman Mousavi, Azin Movahedi, Majid Bavandpour. Experimental investigation of pressure fluctuation on the bed of compound flip buckets. ISH Journal of Hydraulic Engineering. 2017; 24 (1):45-52.

Chicago/Turabian Style

Omid Aminoroayaie Yamini; M. R. Kavianpour; S. Hooman Mousavi; Azin Movahedi; Majid Bavandpour. 2017. "Experimental investigation of pressure fluctuation on the bed of compound flip buckets." ISH Journal of Hydraulic Engineering 24, no. 1: 45-52.