Nargess Moghaddassi
Verified @pnu.ac.ir
Assistant Professor, Department of Civil Engineering, Payame Noor University, Nakhl Street, 193953697, Tehran, Iran. (Corresponding Author). Telephone Number: (+98) 9171733648, Fax Number: (+98) 2123320000. Email: nmoghaddassi@pnu.ac.ir. ORCID: 0000-0002-6442-6380
FUTURE PROJECTS
Experimental Analysis of Scouring Characteristics in Meandering Channels: The Role of U/Uc and Position of Pier Group
This study presents an experimental investigation on the influence of flow velocity and pier group positioning parameters on scour characteristics in meandering channels. The experiments were conducted at different flow velocity ratios relative to the critical velocity, specifically 0.9 and 0.98. The findings reveal that an increase in the U/Uc ratio from 0.9 to 0.98 results in a notable rise in the maximum scour depth around pier groups situated at various positions. Regardless of the channel geometry, the maximum scour depth consistently occurs when the pier group is positioned opposite the individual piers. Furthermore, the scour depth is significantly maximized when the pier group is placed at the 225-degree position. The results further indicate that, in all cases, the maximum scour volume increases for pier groups and single-pier configurations located in the lower bend compared to the upper bend. Additionally, transitioning from single-pier arrangements to pier groups at U/Uc=0.
Applications Invited
Scopus Publications
Scopus Publications
Nargess Moghaddassi, Mohammad Vaghefi, and Maryam Akbari
Springer Science and Business Media LLC
Nargess Moghaddassi, Mohammad Vaghefi, and Abdolmahdi Behroozi
Springer Science and Business Media LLC
Saeed Talatian Azad, Nargess Moghaddassi, and Mesbah Sayehbani
Springer Science and Business Media LLC
Nargess Moghaddassi, Seyed Habib Musavi-Jahromi, Mohammad Vaghefi, and Amir Khosrojerdi
MDPI AG
As 180-degree meanders are observed in abundance in nature, a meandering channel with two consecutive 180-degree bends was designed and constructed to investigate bed topography variations. These two 180-degree mild bends are located between two upstream and downstream straight paths. In this study, different mean velocity-to-critical velocity ratios have been tested at the upstream straight path to determine the meander’s incipient motion. To this end, bed topography variations along the meander and the downstream straight path were addressed for different mean velocity-to-critical velocity ratios. In addition, the upstream bend’s effect on the downstream bend was investigated. Results indicated that the maximum scour depth at the downstream bend increased as a result of changing the mean velocity-to-critical velocity ratio from 0.8 to 0.84, 0.86, 0.89, 0.92, 0.95, and 0.98 by, respectively, 1.5, 2.5, 5, 10, 12, and 26 times. Moreover, increasing the ratio increased the maximum sedimentary height by 3, 10, 23, 48, 49, and 56 times. The upstream bend’s incipient motion was observed for the mean velocity-to-critical velocity ratio of 0.89, while the downstream bend’s incipient motion occurred for the ratio of 0.78.