Comparative Analysis of Sediment Transport Capacity Methods for Predicting Channel Bed Deformation in Weakly Cohesive Canals

Abstract

Reliable prediction of channel bed deformation is essential for the hydraulic design, rehabilitation, and operation of irrigation canals with weakly cohesive beds. However, the presence of both suspended sediment and a small proportion of cohesive material complicates the application of conventional sediment transport equations. This study evaluates the applicability of four sediment transport capacity methods — Ackers – White, Engelund – Hansen, Yang, and Laursen – Copeland — for predicting bed deformation under weakly cohesive canal conditions using the HEC - RAS hydraulic model. The Amu – Bukhara Machine Canal was selected as the case study, where field measurements of hydraulic and sediment characteristics collected during 2023 were used for model implementation and validation. Model predictions were compared with observed channel deformation and operational sedimentation records. The results show that the evaluated methods produce significantly different estimates of bed deformation. Ackers – White, Yang, and Engelund – Hansen generally overestimated deformation, whereas the Laursen – Copeland method provided predictions that agreed most closely with field observations.

Keywords

References

1. Arifjanov, A. and Fatxullaev, A., 2019, December. Natural Studies for Forming Stable Channel Sections. In Journal of Physics: Conference Series (Vol. 1425, No. 1, p. 012025). IOP Publishing.
2. Eshev, S., Latipov, S., Qurbonov, A., Sagdiyev, J., Berdiev, M. and Mamatov, N., 2021, January. Non-eroding speed of water flow of channels running in cohesive soils. In IOP Conference Series: Materials Science and Engineering (Vol. 1030, No. 1, p. 012131). IOP Publishing.
3. Khazratov, A., & Rakhmatov, M. (2024). PROBLEMS OF HYDRAULIC CALCULATION OF EARTHEN CHANNELS. Innovatsion texnologiyalar, 54(02).
4. Eshev, S. S., Xazratov, A. N., Gʻayimnazarov, I. X., & Jumayev, A. R. O. G. L. (2023). QASHQADARYO VILOYATIDA SUV RESURSLARIDAN SAMARALI FOYDALANISH MASALALARI. Oriental renaissance: Innovative, educational, natural and social sciences, 3(12), 406-414.
5. Arifjanov, A., Samiev, L., Apakhodjaeva, T. and Akmalov, S., 2019, December. Distribution of river sediment in channels. In IOP Conference Series: Earth and Environmental Science (Vol. 403, No. 1, p. 012153). IOP Publishing.
6. Arifjanov, A., Samiyev, L., Akhmedov, I. and Atakulov, D., 2021. Innovative technologies in the assessment of accumulation and erosion processes in the channels. Turkish Journal of Computer and Mathematics Education, 12(4), pp.110-114.
7. Khazratov, A. N., Axmadjon о‘g‘li S. A., & Sobirov, F. C. (2026). Channel Deformation Processes in the Amu – Bukhara Machine Canal. American Journal of Technology Advancement, 3(5), 109 – 116. https://doi.org/10.31149/ajta.v3i5.4198
8. Sobirov, F. C., & Xazratov, A. N. (2024). IRRIGATSIYA KANALLARIDAGI QIRG’OQ DEFORMATSIYASINI TADQIQ QILISH. Oriental renaissance: Innovative, educational, natural and social sciences, 4(10), 349-359.
9. Khazratov A.N., Sobirov F.Ch; Study of Side Wall Deformation in Irrigation Channels; Miasto Przyszlosci Kielce 2024; Impact Factor: 9.9 ISSN-L: 2544-980X; 715-722-betlar
10. Brunner, G. W. (2001). HEC-RAS hydraulic reference manual. Davis: US Army Corps of Engineers, Hydrologic Engineering Center.
11. Brunner, G. W. (2016). HEC-RAS hydraulic reference manual, version 5.0. US Army Corps of Engineers, Hydrologic Engineering Center, Davis, CA.
12. Brunner, G. W., & Gibson, S. (2005). Sediment transport modeling in HEC RAS. In Impacts of global climate change (pp. 1-12).
13. Гайимназаров, И. Х. (2024). НАТУРНЫЕ ИССЛЕДОВАНИЯ ПО ОПРЕДЕЛЕНИЮ РАСХОДА НАНОСОВ В УСЛОВИЯХ НЕСТАЦИОНАРНОГО ТЕЧЕНИЯ. Oriental renaissance: Innovative, educational, natural and social sciences, 4(4), 317-324.
14. Depeweg, H. and Méndez, N., 2007. A New Approach to Sediment Transport in the Design and Operation of Irrigation Canals: UNESCO-IHE Lecture Note Series. CRC Press.
15. Yang, C.T., 1996. Sediment transport: theory and practice (Vol. 396). New York: McGraw-Hill.