Hydrodynamic Analysis of a Selected Reach of the Jamuna River under Structural Interventions Using Delft3D    

Hydrodynamic Analysis of a Selected Reach of the Jamuna River under Structural Interventions Using Delft3D | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 10 February 2026 V1 Latest version Share on Hydrodynamic Analysis of a Selected Reach of the Jamuna River under Structural Interventions Using Delft3D Authors : Md. Rasel Rana , Sujoy Dey 0009-0008-5281-4467 [email protected] , Pranto Kumar Sarker 0009-0009-9577-7093 , K. M. Ahtesham Hossain Raju , and S. M. Tasin Zahid Authors Info & Affiliations https://doi.org/10.22541/au.177075227.74045210/v1 105 views 96 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Bangladesh is experiencing severe bank erosion on the Jamuna River, one of the world's most dynamic and braided rivers. Groynes are widely used in various river training projects to control flow and stabilize banks by lowering velocity and promoting sediment deposition. The function and efficiency of groyne structures in terms of the ideal groyne number and arrangement on the hydrodynamics in the crucial 23-kilometer section of the Jamuna River in Bangladesh are examined in this paper. A popular two-and three-dimensional hydrodynamic model, Delft3D-FLOW, was utilized to assess key parameters, including bed shear stress, water level, and velocity distribution, as well as to simulate flow responses under various intervention scenarios. Water level, discharge, and bathymetry datasets from the Institute of Water Modeling (IWM) for the two-year period of 2021-2022 were processed for model setup. The RGFGRID and QUICKIN modules of Delft3D were utilized to generate the curvilinear grid and bathymetry, ensuring an accurate representation of river morphology. Manning's n was used as the main tuning parameter for the model's calibration; n = 0.020 produced the best fit (R² = 0.98) between the simulated and observed water levels at Sariakandi station (SW-15J). Strong model reliability (R² = 0.97) was validated against water level data from 2022, enabling additional simulations of various groyne configurations, such as single, double, triple, and quadruple groynes with spacing-to-length (S/L) ratios of 1.5, 2.0, and 2.5. Groynes significantly changed flow dynamics by rerouting high-velocity currents away from the riverbank, according to simulation results. Erosion control could be improved by increasing the number of groynes and optimizing spacing, which decreases near-bank velocities and bed shear stress. The most balanced results were obtained with configurations featuring four groynes and an S/L ratio of 2.0, which effectively avoided excessive flow concentration between structures while achieving a significant reduction in velocity. On the other hand, redirected flow was able to impinge on downstream banks when S/L ratios exceeded 2.5, which may have increased the risk of erosion. The results highlight Delft3D's efficacy in assessing structural interventions for riverbank protection and offer guidance on optimizing groyne design for highly braided rivers. This method provides river engineers and planners with a useful framework for creating sustainable interventions that reduce erosion while preserving navigability and the equilibrium of sediment transport. To enhance the resilience of riverbank protection strategies, future research should incorporate morphological modeling to assess long-term changes in the riverbed and investigate climate-induced variations in flow and sediment regimes. Conference: 8th International Conference on Civil Engineering for Sustainable Development (ICCESD 2026), February 5–7, 2026, KUET, Bangladesh; Paper ID: 227, Session Type: Technical Session (Virtual), Track: Water Resources Engineering – V1 (WRE-V1), Presentation Time: 17:20–17:30 BST, Session Time: 16:30–18:10 BST, Date: 5 February 2026, Venue: F, Room No. CE 309 Supplementary Material File (paper id 227_camera ready final paper_iccesd 2026.pdf) Download 1.98 MB Information & Authors Information Version history V1 Version 1 10 February 2026 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords bank erosion delft3d groyne hydrodynamic analysis jamuna river Authors Affiliations Md. Rasel Rana View all articles by this author Sujoy Dey 0009-0008-5281-4467 [email protected] View all articles by this author Pranto Kumar Sarker 0009-0009-9577-7093 View all articles by this author K. M. Ahtesham Hossain Raju View all articles by this author S. M. Tasin Zahid View all articles by this author Metrics & Citations Metrics Article Usage 105 views 96 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Md. Rasel Rana, Sujoy Dey, Pranto Kumar Sarker, et al. Hydrodynamic Analysis of a Selected Reach of the Jamuna River under Structural Interventions Using Delft3D . Authorea . 10 February 2026. DOI: https://doi.org/10.22541/au.177075227.74045210/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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