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Miskar Maini
Institut Teknologi Sumatera
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Journal : Civil Engineering Journal

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Alternative Method for Determining Manning's Roughness Coefficient Using Two-Point Velocity in Equilibrium and Nonequilibrium Sediment Transport Maini, Miskar; Kironoto, Bambang A.; Rahardjo, Adam P.; Istiarto
Civil Engineering Journal Vol. 11 No. 7 (2025): July
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-07-02

Abstract

Understanding flow resistance equations, such as Manning’s roughness equation, is essential for river design and improvement. Estimating Manning’s roughness coefficient becomes more complicated when sediment transport is involved. This study takes an alternative approach by using velocity profiles to examine how sediment transport affects Manning’s roughness coefficient. To achieve this goal, 1200 velocity profiles with sediment-feeding (SF) and non-sediment-feeding (NSF) flows are evaluated to determine the (composite) Manning’s roughness coefficient. Sediment-feeding flows describe sediment flow under equilibrium conditions, whereas non-sediment-feeding flows represent sediment flow under nonequilibrium conditions. A Sontek 16-MHz Acoustic Doppler Velocimeter is used to measure the velocity (and turbulence) profiles. In addition to the present data, 225 secondary velocity profile data sets are analyzed in this study. The research findings indicate that the composite Manning’s roughness coefficient nco can be determined from Manning’s roughness coefficient nz/B at z/B in the transversal direction, using two points of the velocity profile at y/H = 0.2 and 0.4 in the vertical direction. The differences in the velocity profile shape (u/U) due to sediment feeding, particularly in inner regions (y/H ≤ 0.2), affect the value of nz/B. nco for sediment-feeding flows are generally higher than the cross-section Manning roughness coefficient n. As nco (based on nz/B) is based on the velocity profile, the nco values change with sediment transport. Meanwhile, the n values remain unchanged because the equation variables cannot detect the presence of sediment transport. For non-sediment-feeding flow, the differences in nco with n are 14.80% for a fixed bed (FB) and 18.17% for a movable bed (MB). The differences are even more pronounced for sediment-feeding flow at 33.01% for a fixed bed and 36.52% for a movable bed. The point where nz/B/nco = 1 occurs at z/B = 0.2 from the channel sidewall. This suggests that nz/B, measured at z/B = 0.2 from the channel sidewall, provides a good representation of nco for the section.
Co-Authors Afenda, Gerald Samuel Afriana, Velia Dwi Agatha Padma Laksitaningtyas, Agatha Padma Ahmad Yudi Akbar, Muhammad Irfan Khairullah Al Farisi, Muhammad Ilham Al Thoriq, Alif Muhammad Alexander, Rionaldo Alfadla, Moza Nayla Alfinna Mahya Ummati, Alfinna Mahya Andena , Rahma Andry Yuliyanto Angelica, Sabrina Anton Saputra, Anton Anwar, Ilyas Aprilia, Ayu Sinta Apriwelni, Siska Arman, Renata Ulima Aulia Hidayat Burhamidar Aulia, Khoiria Artha Ayu Sinta Aprilia Ayudia Hardiyani Kiranaratri Ayudia Hardiyani Kiranaratri Berliantine, Febi Getzi Br Purba , Angel Permata Sari Budi Ribowo, Anggarani Cahyo Agung Saputra Cibro, Dantomi Djoko Legono Ekaputra, Reza Asriandi Erdina Tyagita Utami Fadillah Sabri Fathurrahman, Arif Fitriana, Indri Rahmandhani Furqan Ali Yusuf Galih Rio Prayogi Gulo, Fransiscus Yana Julio Hakim, Nasywa Naura Fitriani Ilham, Rahmat Arifin Ilpandari Ilpandari Ilpandari, Ilpandari Istiarto Julita Hayati Junita Eka Susanti Khanza, Ayu Kamila Kironoto, Bambang A. M Gilang Indra Mardika Marina, Bernaditha Catur Mashuri Mashuri Mashuri Matondang, Nikmah Azhima Putri Michael Michael Mukhlis, Sasy Gisda Nadi, Abi Berkah Nadi, Muhammad Abi Berkah Nurfauziah, Haliza Nurjanah, Suci P Kirtinanda Pangestu, Bagus Prayogi Pratama, Krisna Putra, M. Ikhsan Wisna Putra, Satria Pratama Putri Ayu Dwiyana Rahardjo, Adam P. Rahmat Kurniawan Rahmat Kurniawan Ramadhan , Farhan Nur Ramadhan, Windu Revi Ramadhani, Mutia Reza Asriandi Ekaputra Sambuaga, Arif Rachman Saragih, Yesika Febyanti Sari , Tri Nilam Selviana, Lulu Sihombing, Tera Melya Patrice Simatupang, Partogi Josua Gembira Sitepu, Arif Rahman Hakim Siti Rahma Syafira, Alifia Angel Joane Syahidus Syuhada Syaputra, M. Raihan Tambunan, Hermon Frederik Tarigan, Biela Thoricelly Br Utami, Erdina Tyagita Yusri , Muhammad Yusuf, Furqan Ali Zhafira, Elian